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       News
       ====
       Version 2.10.0 alpha1
       ---------------------
       *(unreleased)*
       Incompatible/important changes
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       - Adding disks with 'gnt-instance modify' now waits for the disks to sync per
         default. Specify --no-wait-for-sync to override this behavior.
       - The Ganeti python code now adheres to a private-module layout. In particular,
         the module 'ganeti' is no longer in the python search path.
       - On instance allocation, the iallocator now considers non-LVM storage
         properly. In particular, actual file storage space information is used
         when allocating space for a file/sharedfile instance.
       - When disabling disk templates cluster-wide, the cluster now first
         checks whether there are instances still using those templates.
       - 'gnt-node list-storage' now also reports storage information about
         file-based storage types.
       New features
       ~~~~~~~~~~~~
       - KVM hypervisors can now access RBD storage directly without having to
         go through a block device.
       - A new command 'gnt-cluster upgrade' was added that automates the upgrade
         procedure between two Ganeti versions that are both 2.10 or higher.
       - The move-instance command can now change disk templates when moving
         instances, and does not require any node placement options to be
         specified if the destination cluster has a default iallocator.
       - Users can now change the soundhw and cpuid settings for XEN hypervisors.
       - Hail and hbal now have the (optional) capability of accessing average CPU
         load information through the monitoring deamon, and to use it to dynamically
         adapt the allocation of instances.
       - Hotplug support. Introduce new option '--hotplug' to ``gnt-instance modify``
         so that disk and NIC modifications take effect without the need of actual
         reboot. There are a couple of constrains currently for this feature:
          - only KVM hypervisor (versions >= 1.0) supports it,
          - one can not (yet) hotplug a disk using userspace access mode for RBD
          - in case of a downgrade instances should suffer a reboot in order to
            be migratable (due to core change of runtime files)
       Misc changes
       ~~~~~~~~~~~~
       - A new test framework for logical units was introduced and the test
         coverage for logical units was improved significantly.
       - Opcodes are entirely generated from Haskell using the tool 'hs2py' and
         the module 'src/Ganeti/OpCodes.hs'.
       - Constants are also generated from Haskell using the tool
         'hs2py-constants' and the module 'src/Ganeti/Constants.hs', with the
         exception of socket related constants, which require changing the
         cluster configuration file, and HVS related constants, because they
         are part of a port of instance queries to Haskell.  As a result, these
         changes will be part of the next release of Ganeti.
       New dependencies
       ~~~~~~~~~~~~~~~~
       The following new dependencies have been added/updated.
       Python
       - The version requirements for ``python-mock`` have increased to at least
         version 1.0.1. It is still used for testing only.
       Version 2.9.0
       -------------
       *(Released Tue, 5 Nov 2013)*
       Incompatible/important changes
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       - hroller now also plans for capacity to move non-redundant instances off
         any node to be rebooted; the old behavior of completely ignoring any
         non-redundant instances can be restored by adding the --ignore-non-redundant
         option.
       - The cluster option '--no-lvm-storage' was removed in favor of the new option
         '--enabled-disk-templates'.
       - On instance creation, disk templates no longer need to be specified
         with '-t'. The default disk template will be taken from the list of
         enabled disk templates.
       - The monitoring daemon is now running as root, in order to be able to collect
         information only available to root (such as the state of Xen instances).
       - The ConfD client is now IPv6 compatible.
       - File and shared file storage is no longer dis/enabled at configure time,
         but using the option '--enabled-disk-templates' at cluster initialization and
         modification.
       - The default directories for file and shared file storage are not anymore
         specified at configure time, but taken from the cluster's configuration.
         They can be set at cluster initialization and modification with
         '--file-storage-dir' and '--shared-file-storage-dir'.
       - Cluster verification now includes stricter checks regarding the
         default file and shared file storage directories. It now checks that
         the directories are explicitely allowed in the 'file-storage-paths' file and
         that the directories exist on all nodes.
       - The list of allowed disk templates in the instance policy and the list
         of cluster-wide enabled disk templates is now checked for consistency
         on cluster or group modification. On cluster initialization, the ipolicy
         disk templates are ensured to be a subset of the cluster-wide enabled
         disk templates.
       New features
       ~~~~~~~~~~~~
       - DRBD 8.4 support. Depending on the installed DRBD version, Ganeti now uses
         the correct command syntax. It is possible to use different DRBD versions
         on different nodes as long as they are compatible to each other. This
         enables rolling upgrades of DRBD with no downtime. As permanent operation
         of different DRBD versions within a node group is discouraged,
         ``gnt-cluster verify`` will emit a warning if it detects such a situation.
       - New "inst-status-xen" data collector for the monitoring daemon, providing
         information about the state of the xen instances on the nodes.
       - New "lv" data collector for the monitoring daemon, collecting data about the
         logical volumes on the nodes, and pairing them with the name of the instances
         they belong to.
       - New "diskstats" data collector, collecting the data from /proc/diskstats and
         presenting them over the monitoring daemon interface.
       - The ConfD client is now IPv6 compatible.
       New dependencies
       ~~~~~~~~~~~~~~~~
       The following new dependencies have been added.
       Python
       - ``python-mock`` (http://www.voidspace.org.uk/python/mock/) is now a required
         for the unit tests (and only used for testing).
       Haskell
       - ``hslogger`` (http://software.complete.org/hslogger) is now always
         required, even if confd is not enabled.
       Since 2.9.0 rc3
       ~~~~~~~~~~~~~~~
       - Correctly start/stop luxid during gnt-cluster master-failover (inherited
         from stable-2.8)
       - Improved error messsages (inherited from stable-2.8)
       Version 2.9.0 rc3
       -----------------
       *(Released Tue, 15 Oct 2013)*
       The third release candidate in the 2.9 series. Since 2.9.0 rc2:
       - in implicit configuration upgrade, match ipolicy with enabled disk templates
       - improved harep documentation (inherited from stable-2.8)
       Version 2.9.0 rc2
       -----------------
       *(Released Wed, 9 Oct 2013)*
       The second release candidate in the 2.9 series. Since 2.9.0 rc1:
       - Fix bug in cfgupgrade that led to failure when upgrading from 2.8 with
         at least one DRBD instance.
       - Fix bug in cfgupgrade that led to an invalid 2.8 configuration after
         downgrading.
       Version 2.9.0 rc1
       -----------------
       *(Released Tue, 1 Oct 2013)*
       The first release candidate in the 2.9 series. Since 2.9.0 beta1:
       - various bug fixes
       - update of the documentation, in particular installation instructions
       - merging of LD_* constants into DT_* constants
       - python style changes to be compatible with newer versions of pylint
       Version 2.9.0 beta1
       -------------------
       *(Released Thu, 29 Aug 2013)*
       This was the first beta release of the 2.9 series. All important changes
       are listed in the latest 2.9 entry.
       Version 2.8.1
       -------------
       *(Released Thu, 17 Oct 2013)*
       - Correctly start/stop luxid during gnt-cluster master-failover
       - Don't attempt IPv6 ssh in case of IPv4 cluster (Issue 595)
       - Fix path for the job queue serial file
       - Improved harep man page
       - Minor documentation improvements
       Version 2.8.0
       -------------
       *(Released Mon, 30 Sep 2013)*
       Incompatible/important changes
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       - Instance policy can contain multiple instance specs, as described in
         the “Constrained instance sizes” section of :doc:`Partitioned Ganeti
         <design-partitioned>`. As a consequence, it's not possible to partially change
         or override instance specs. Bounding specs (min and max) can be specified as a
         whole using the new option ``--ipolicy-bounds-specs``, while standard
         specs use the new option ``--ipolicy-std-specs``.
       - The output of the info command of gnt-cluster, gnt-group, gnt-node,
         gnt-instance is a valid YAML object.
       - hail now honors network restrictions when allocating nodes. This led to an
         update of the IAllocator protocol. See the IAllocator documentation for
         details.
       - confd now only answers static configuration request over the network. luxid
         was extracted, listens on the local LUXI socket and responds to live queries.
         This allows finer grained permissions if using separate users.
       New features
       ~~~~~~~~~~~~
       - The :doc:`Remote API <rapi>` daemon now supports a command line flag
         to always require authentication, ``--require-authentication``. It can
         be specified in ``$sysconfdir/default/ganeti``.
       - A new cluster attribute 'enabled_disk_templates' is introduced. It will
         be used to manage the disk templates to be used by instances in the cluster.
         Initially, it will be set to a list that includes plain, drbd, if they were
         enabled by specifying a volume group name, and file and sharedfile, if those
         were enabled at configure time. Additionally, it will include all disk
         templates that are currently used by instances. The order of disk templates
         will be based on Ganeti's history of supporting them. In the future, the
         first entry of the list will be used as a default disk template on instance
         creation.
       - ``cfgupgrade`` now supports a ``--downgrade`` option to bring the
         configuration back to the previous stable version.
       - Disk templates in group ipolicy can be restored to the default value.
       - Initial support for diskless instances and virtual clusters in QA.
       - More QA and unit tests for instance policies.
       - Every opcode now contains a reason trail (visible through ``gnt-job info``)
         describing why the opcode itself was executed.
       - The monitoring daemon is now available. It allows users to query the cluster
         for obtaining information about the status of the system. The daemon is only
         responsible for providing the information over the network: the actual data
         gathering is performed by data collectors (currently, only the DRBD status
         collector is available).
       - In order to help developers work on Ganeti, a new script
         (``devel/build_chroot``) is provided, for building a chroot that contains all
         the required development libraries and tools for compiling Ganeti on a Debian
         Squeeze system.
       - A new tool, ``harep``, for performing self-repair and recreation of instances
         in Ganeti has been added.
       - Split queries are enabled for tags, network, exports, cluster info, groups,
         jobs, nodes.
       - New command ``show-ispecs-cmd`` for ``gnt-cluster`` and ``gnt-group``.
         It prints the command line to set the current policies, to ease
         changing them.
       - Add the ``vnet_hdr`` HV parameter for KVM, to control whether the tap
         devices for KVM virtio-net interfaces will get created with VNET_HDR
         (IFF_VNET_HDR) support. If set to false, it disables offloading on the
         virtio-net interfaces, which prevents host kernel tainting and log
         flooding, when dealing with broken or malicious virtio-net drivers.
         It's set to true by default.
       - Instance failover now supports a ``--cleanup`` parameter for fixing previous
         failures.
       - Support 'viridian' parameter in Xen HVM
       - Support DSA SSH keys in bootstrap
       - To simplify the work of packaging frameworks that want to add the needed users
         and groups in a split-user setup themselves, at build time three files in
         ``doc/users`` will be generated. The ``groups`` files contains, one per line,
         the groups to be generated, the ``users`` file contains, one per line, the
         users to be generated, optionally followed by their primary group, where
         important. The ``groupmemberships`` file contains, one per line, additional
         user-group membership relations that need to be established. The syntax of
         these files will remain stable in all future versions.
       New dependencies
       ~~~~~~~~~~~~~~~~
       The following new dependencies have been added:
       For Haskell:
       - The ``curl`` library is not optional anymore for compiling the Haskell code.
       - ``snap-server`` library (if monitoring is enabled).
       For Python:
       - The minimum Python version needed to run Ganeti is now 2.6.
       - ``yaml`` library (only for running the QA).
       Since 2.8.0 rc3
       ~~~~~~~~~~~~~~~
       - Perform proper cleanup on termination of Haskell daemons
       - Fix corner-case in handling of remaining retry time
       Version 2.8.0 rc3
       -----------------
       *(Released Tue, 17 Sep 2013)*
       - To simplify the work of packaging frameworks that want to add the needed users
         and groups in a split-user setup themselves, at build time three files in
         ``doc/users`` will be generated. The ``groups`` files contains, one per line,
         the groups to be generated, the ``users`` file contains, one per line, the
         users to be generated, optionally followed by their primary group, where
         important. The ``groupmemberships`` file contains, one per line, additional
         user-group membership relations that need to be established. The syntax of
         these files will remain stable in all future versions.
       - Add a default to file-driver when unspecified over RAPI (Issue 571)
       - Mark the DSA host pubkey as optional, and remove it during config downgrade
         (Issue 560)
       - Some documentation fixes
       Version 2.8.0 rc2
       -----------------
       *(Released Tue, 27 Aug 2013)*
       The second release candidate of the 2.8 series. Since 2.8.0. rc1:
       - Support 'viridian' parameter in Xen HVM (Issue 233)
       - Include VCS version in ``gnt-cluster version``
       - Support DSA SSH keys in bootstrap (Issue 338)
       - Fix batch creation of instances
       - Use FQDN to check master node status (Issue 551)
       - Make the DRBD collector more failure-resilient
       Version 2.8.0 rc1
       -----------------
       *(Released Fri, 2 Aug 2013)*
       The first release candidate of the 2.8 series. Since 2.8.0 beta1:
       - Fix upgrading/downgrading from 2.7
       - Increase maximum RAPI message size
       - Documentation updates
       - Split ``confd`` between ``luxid`` and ``confd``
       - Merge 2.7 series up to the 2.7.1 release
       - Allow the ``modify_etc_hosts`` option to be changed
       - Add better debugging for ``luxid`` queries
       - Expose bulk parameter for GetJobs in RAPI client
       - Expose missing ``network`` fields in RAPI
       - Add some ``cluster verify`` tests
       - Some unittest fixes
       - Fix a malfunction in ``hspace``'s tiered allocation
       - Fix query compatibility between haskell and python implementations
       - Add the ``vnet_hdr`` HV parameter for KVM
       - Add ``--cleanup`` to instance failover
       - Change the connected groups format in ``gnt-network info`` output; it
         was previously displayed as a raw list by mistake. (Merged from 2.7)
       Version 2.8.0 beta1
       -------------------
       *(Released Mon, 24 Jun 2013)*
       This was the first beta release of the 2.8 series. All important changes
       are listed in the latest 2.8 entry.
       Version 2.7.2
       -------------
       *(Released Thu, 26 Sep 2013)*
       - Change the connected groups format in ``gnt-network info`` output; it
         was previously displayed as a raw list by mistake
       - Check disk template in right dict when copying
       - Support multi-instance allocs without iallocator
       - Fix some errors in the documentation
       - Fix formatting of tuple in an error message
       Version 2.7.1
       -------------
       *(Released Thu, 25 Jul 2013)*
       - Add logrotate functionality in daemon-util
       - Add logrotate example file
       - Add missing fields to network queries over rapi
       - Fix network object timestamps
       - Add support for querying network timestamps
       - Fix a typo in the example crontab
       - Fix a documentation typo
       Version 2.7.0
       -------------
       *(Released Thu, 04 Jul 2013)*
       Incompatible/important changes
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       - Instance policies for disk size were documented to be on a per-disk
         basis, but hail applied them to the sum of all disks. This has been
         fixed.
       - ``hbal`` will now exit with status 0 if, during job execution over
         LUXI, early exit has been requested and all jobs are successful;
         before, exit status 1 was used, which cannot be differentiated from
         "job error" case
       - Compatibility with newer versions of rbd has been fixed
       - ``gnt-instance batch-create`` has been changed to use the bulk create
         opcode from Ganeti. This lead to incompatible changes in the format of
         the JSON file. It's now not a custom dict anymore but a dict
         compatible with the ``OpInstanceCreate`` opcode.
       - Parent directories for file storage need to be listed in
         ``$sysconfdir/ganeti/file-storage-paths`` now. ``cfgupgrade`` will
         write the file automatically based on old configuration values, but it
         can not distribute it across all nodes and the file contents should be
         verified. Use ``gnt-cluster copyfile
         $sysconfdir/ganeti/file-storage-paths`` once the cluster has been
         upgraded. The reason for requiring this list of paths now is that
         before it would have been possible to inject new paths via RPC,
         allowing files to be created in arbitrary locations. The RPC protocol
         is protected using SSL/X.509 certificates, but as a design principle
         Ganeti does not permit arbitrary paths to be passed.
       - The parsing of the variants file for OSes (see
         :manpage:`ganeti-os-interface(7)`) has been slightly changed: now empty
         lines and comment lines (starting with ``#``) are ignored for better
         readability.
       - The ``setup-ssh`` tool added in Ganeti 2.2 has been replaced and is no
         longer available. ``gnt-node add`` now invokes a new tool on the
         destination node, named ``prepare-node-join``, to configure the SSH
         daemon. Paramiko is no longer necessary to configure nodes' SSH
         daemons via ``gnt-node add``.
       - Draining (``gnt-cluster queue drain``) and un-draining the job queue
         (``gnt-cluster queue undrain``) now affects all nodes in a cluster and
         the flag is not reset after a master failover.
       - Python 2.4 has *not* been tested with this release. Using 2.6 or above
         is recommended. 2.6 will be mandatory from the 2.8 series.
       New features
       ~~~~~~~~~~~~
       - New network management functionality to support automatic allocation
         of IP addresses and managing of network parameters. See
         :manpage:`gnt-network(8)` for more details.
       - New external storage backend, to allow managing arbitrary storage
         systems external to the cluster. See
         :manpage:`ganeti-extstorage-interface(7)`.
       - New ``exclusive-storage`` node parameter added, restricted to
         nodegroup level. When it's set to true, physical disks are assigned in
         an exclusive fashion to instances, as documented in :doc:`Partitioned
         Ganeti <design-partitioned>`.  Currently, only instances using the
         ``plain`` disk template are supported.
       - The KVM hypervisor has been updated with many new hypervisor
         parameters, including a generic one for passing arbitrary command line
         values. See a complete list in :manpage:`gnt-instance(8)`. It is now
         compatible up to qemu 1.4.
       - A new tool, called ``mon-collector``, is the stand-alone executor of
         the data collectors for a monitoring system. As of this version, it
         just includes the DRBD data collector, that can be executed by calling
         ``mon-collector`` using the ``drbd`` parameter. See
         :manpage:`mon-collector(7)`.
       - A new user option, :pyeval:`rapi.RAPI_ACCESS_READ`, has been added
         for RAPI users. It allows granting permissions to query for
         information to a specific user without giving
         :pyeval:`rapi.RAPI_ACCESS_WRITE` permissions.
       - A new tool named ``node-cleanup`` has been added. It cleans remains of
         a cluster from a machine by stopping all daemons, removing
         certificates and ssconf files. Unless the ``--no-backup`` option is
         given, copies of the certificates are made.
       - Instance creations now support the use of opportunistic locking,
         potentially speeding up the (parallel) creation of multiple instances.
         This feature is currently only available via the :doc:`RAPI
         <rapi>` interface and when an instance allocator is used. If the
         ``opportunistic_locking`` parameter is set the opcode will try to
         acquire as many locks as possible, but will not wait for any locks
         held by other opcodes. If not enough resources can be found to
         allocate the instance, the temporary error code
         :pyeval:`errors.ECODE_TEMP_NORES` is returned. The operation can be
         retried thereafter, with or without opportunistic locking.
       - New experimental linux-ha resource scripts.
       - Restricted-commands support: ganeti can now be asked (via command line
         or rapi) to perform commands on a node. These are passed via ganeti
         RPC rather than ssh. This functionality is restricted to commands
         specified on the ``$sysconfdir/ganeti/restricted-commands`` for security
         reasons. The file is not copied automatically.
       Misc changes
       ~~~~~~~~~~~~
       - Diskless instances are now externally mirrored (Issue 237). This for
         now has only been tested in conjunction with explicit target nodes for
         migration/failover.
       - Queries not needing locks or RPC access to the node can now be
         performed by the confd daemon, making them independent from jobs, and
         thus faster to execute. This is selectable at configure time.
       - The functionality for allocating multiple instances at once has been
         overhauled and is now also available through :doc:`RAPI <rapi>`.
       There are no significant changes from version 2.7.0~rc3.
       Version 2.7.0 rc3
       -----------------
       *(Released Tue, 25 Jun 2013)*
       - Fix permissions on the confd query socket (Issue 477)
       - Fix permissions on the job archive dir (Issue 498)
       - Fix handling of an internal exception in replace-disks (Issue 472)
       - Fix gnt-node info handling of shortened names (Issue 497)
       - Fix gnt-instance grow-disk when wiping is enabled
       - Documentation improvements, and support for newer pandoc
       - Fix hspace honoring ipolicy for disks (Issue 484)
       - Improve handling of the ``kvm_extra`` HV parameter
       Version 2.7.0 rc2
       -----------------
       *(Released Fri, 24 May 2013)*
       - ``devel/upload`` now works when ``/var/run`` on the target nodes is a
         symlink.
       - Disks added through ``gnt-instance modify`` or created through
         ``gnt-instance recreate-disks`` are wiped, if the
         ``prealloc_wipe_disks`` flag is set.
       - If wiping newly created disks fails, the disks are removed. Also,
         partial failures in creating disks through ``gnt-instance modify``
         triggers a cleanup of the partially-created disks.
       - Removing the master IP address doesn't fail if the address has been
         already removed.
       - Fix ownership of the OS log dir
       - Workaround missing SO_PEERCRED constant (Issue 191)
       Version 2.7.0 rc1
       -----------------
       *(Released Fri, 3 May 2013)*
       This was the first release candidate of the 2.7 series. Since beta3:
       - Fix kvm compatibility with qemu 1.4 (Issue 389)
       - Documentation updates (admin guide, upgrade notes, install
         instructions) (Issue 372)
       - Fix gnt-group list nodes and instances count (Issue 436)
       - Fix compilation without non-mandatory libraries (Issue 441)
       - Fix xen-hvm hypervisor forcing nics to type 'ioemu' (Issue 247)
       - Make confd logging more verbose at INFO level (Issue 435)
       - Improve "networks" documentation in :manpage:`gnt-instance(8)`
       - Fix failure path for instance storage type conversion (Issue 229)
       - Update htools text backend documentation
       - Improve the renew-crypto section of :manpage:`gnt-cluster(8)`
       - Disable inter-cluster instance move for file-based instances, because
         it is dependant on instance export, which is not supported for
         file-based instances. (Issue 414)
       - Fix gnt-job crashes on non-ascii characters (Issue 427)
       - Fix volume group checks on non-vm-capable nodes (Issue 432)
       Version 2.7.0 beta3
       -------------------
       *(Released Mon, 22 Apr 2013)*
       This was the third beta release of the 2.7 series. Since beta2:
       - Fix hail to verify disk instance policies on a per-disk basis (Issue 418).
       - Fix data loss on wrong usage of ``gnt-instance move``
       - Properly export errors in confd-based job queries
       - Add ``users-setup`` tool
       - Fix iallocator protocol to report 0 as a disk size for diskless
         instances. This avoids hail breaking when a diskless instance is
         present.
       - Fix job queue directory permission problem that made confd job queries
         fail. This requires running an ``ensure-dirs --full-run`` on upgrade
         for access to archived jobs (Issue 406).
       - Limit the sizes of networks supported by ``gnt-network`` to something
         between a ``/16`` and a ``/30`` to prevent memory bloat and crashes.
       - Fix bugs in instance disk template conversion
       - Fix GHC 7 compatibility
       - Fix ``burnin`` install path (Issue 426).
       - Allow very small disk grows (Issue 347).
       - Fix a ``ganeti-noded`` memory bloat introduced in 2.5, by making sure
         that noded doesn't import masterd code (Issue 419).
       - Make sure the default metavg at cluster init is the same as the vg, if
         unspecified (Issue 358).
       - Fix cleanup of partially created disks (part of Issue 416)
       Version 2.7.0 beta2
       -------------------
       *(Released Tue, 2 Apr 2013)*
       This was the second beta release of the 2.7 series. Since beta1:
       - Networks no longer have a "type" slot, since this information was
         unused in Ganeti: instead of it tags should be used.
       - The rapi client now has a ``target_node`` option to MigrateInstance.
       - Fix early exit return code for hbal (Issue 386).
       - Fix ``gnt-instance migrate/failover -n`` (Issue 396).
       - Fix ``rbd showmapped`` output parsing (Issue 312).
       - Networks are now referenced indexed by UUID, rather than name. This
         will require running cfgupgrade, from 2.7.0beta1, if networks are in
         use.
       - The OS environment now includes network information.
       - Deleting of a network is now disallowed if any instance nic is using
         it, to prevent dangling references.
       - External storage is now documented in man pages.
       - The exclusive_storage flag can now only be set at nodegroup level.
       - Hbal can now submit an explicit priority with its jobs.
       - Many network related locking fixes.
       - Bump up the required pylint version to 0.25.1.
       - Fix the ``no_remember`` option in RAPI client.
       - Many ipolicy related tests, qa, and fixes.
       - Many documentation improvements and fixes.
       - Fix building with ``--disable-file-storage``.
       - Fix ``-q`` option in htools, which was broken if passed more than
         once.
       - Some haskell/python interaction improvements and fixes.
       - Fix iallocator in case of missing LVM storage.
       - Fix confd config load in case of ``--no-lvm-storage``.
       - The confd/query functionality is now mentioned in the security
         documentation.
       Version 2.7.0 beta1
       -------------------
       *(Released Wed, 6 Feb 2013)*
       This was the first beta release of the 2.7 series. All important changes
       are listed in the latest 2.7 entry.
       Version 2.6.2
       -------------
       *(Released Fri, 21 Dec 2012)*
       Important behaviour change: hbal won't rebalance anymore instances which
       have the ``auto_balance`` attribute set to false. This was the intention
       all along, but until now it only skipped those from the N+1 memory
       reservation (DRBD-specific).
       A significant number of bug fixes in this release:
       - Fixed disk adoption interaction with ipolicy checks.
       - Fixed networking issues when instances are started, stopped or
         migrated, by forcing the tap device's MAC prefix to "fe" (issue 217).
       - Fixed the warning in cluster verify for shared storage instances not
         being redundant.
       - Fixed removal of storage directory on shared file storage (issue 262).
       - Fixed validation of LVM volume group name in OpClusterSetParams
         (``gnt-cluster modify``) (issue 285).
       - Fixed runtime memory increases (``gnt-instance modify -m``).
       - Fixed live migration under Xen's ``xl`` mode.
       - Fixed ``gnt-instance console`` with ``xl``.
       - Fixed building with newer Haskell compiler/libraries.
       - Fixed PID file writing in Haskell daemons (confd); this prevents
         restart issues if confd was launched manually (outside of
         ``daemon-util``) while another copy of it was running
       - Fixed a type error when doing live migrations with KVM (issue 297) and
         the error messages for failing migrations have been improved.
       - Fixed opcode validation for the out-of-band commands (``gnt-node
         power``).
       - Fixed a type error when unsetting OS hypervisor parameters (issue
 ); now it's possible to unset all OS-specific hypervisor
         parameters.
       - Fixed the ``dry-run`` mode for many operations: verification of
         results was over-zealous but didn't take into account the ``dry-run``
         operation, resulting in "wrong" failures.
       - Fixed bash completion in ``gnt-job list`` when the job queue has
         hundreds of entries; especially with older ``bash`` versions, this
         results in significant CPU usage.
       And lastly, a few other improvements have been made:
       - Added option to force master-failover without voting (issue 282).
       - Clarified error message on lock conflict (issue 287).
       - Logging of newly submitted jobs has been improved (issue 290).
       - Hostname checks have been made uniform between instance rename and
         create (issue 291).
       - The ``--submit`` option is now supported by ``gnt-debug delay``.
       - Shutting down the master daemon by sending SIGTERM now stops it from
         processing jobs waiting for locks; instead, those jobs will be started
         once again after the master daemon is started the next time (issue
 ).
       - Support for Xen's ``xl`` program has been improved (besides the fixes
         above).
       - Reduced logging noise in the Haskell confd daemon (only show one log
         entry for each config reload, instead of two).
       - Several man page updates and typo fixes.
       Version 2.6.1
       -------------
       *(Released Fri, 12 Oct 2012)*
       A small bugfix release. Among the bugs fixed:
       - Fixed double use of ``PRIORITY_OPT`` in ``gnt-node migrate``, that
         made the command unusable.
       - Commands that issue many jobs don't fail anymore just because some jobs
         take so long that other jobs are archived.
       - Failures during ``gnt-instance reinstall`` are reflected by the exit
         status.
       - Issue 190 fixed. Check for DRBD in cluster verify is enabled only when
         DRBD is enabled.
       - When ``always_failover`` is set, ``--allow-failover`` is not required
         in migrate commands anymore.
       - ``bash_completion`` works even if extglob is disabled.
       - Fixed bug with locks that made failover for RDB-based instances fail.
       - Fixed bug in non-mirrored instance allocation that made Ganeti choose
         a random node instead of one based on the allocator metric.
       - Support for newer versions of pylint and pep8.
       - Hail doesn't fail anymore when trying to add an instance of type
         ``file``, ``sharedfile`` or ``rbd``.
       - Added new Makefile target to rebuild the whole distribution, so that
         all files are included.
       Version 2.6.0
       -------------
       *(Released Fri, 27 Jul 2012)*
       .. attention:: The ``LUXI`` protocol has been made more consistent
          regarding its handling of command arguments. This, however, leads to
          incompatibility issues with previous versions. Please ensure that you
          restart Ganeti daemons soon after the upgrade, otherwise most
          ``LUXI`` calls (job submission, setting/resetting the drain flag,
          pausing/resuming the watcher, cancelling and archiving jobs, querying
          the cluster configuration) will fail.
       New features
       ~~~~~~~~~~~~
       Instance run status
       +++++++++++++++++++
       The current ``admin_up`` field, which used to denote whether an instance
       should be running or not, has been removed. Instead, ``admin_state`` is
       introduced, with 3 possible values -- ``up``, ``down`` and ``offline``.
       The rational behind this is that an instance being “down” can have
       different meanings:
       - it could be down during a reboot
       - it could be temporarily be down for a reinstall
       - or it could be down because it is deprecated and kept just for its
         disk
       The previous Boolean state was making it difficult to do capacity
       calculations: should Ganeti reserve memory for a down instance? Now, the
       tri-state field makes it clear:
       - in ``up`` and ``down`` state, all resources are reserved for the
         instance, and it can be at any time brought up if it is down
       - in ``offline`` state, only disk space is reserved for it, but not
         memory or CPUs
       The field can have an extra use: since the transition between ``up`` and
       ``down`` and vice-versus is done via ``gnt-instance start/stop``, but
       transition between ``offline`` and ``down`` is done via ``gnt-instance
       modify``, it is possible to given different rights to users. For
       example, owners of an instance could be allowed to start/stop it, but
       not transition it out of the offline state.
       Instance policies and specs
       +++++++++++++++++++++++++++
       In previous Ganeti versions, an instance creation request was not
       limited on the minimum size and on the maximum size just by the cluster
       resources. As such, any policy could be implemented only in third-party
       clients (RAPI clients, or shell wrappers over ``gnt-*``
       tools). Furthermore, calculating cluster capacity via ``hspace`` again
       required external input with regards to instance sizes.
       In order to improve these workflows and to allow for example better
       per-node group differentiation, we introduced instance specs, which
       allow declaring:
       - minimum instance disk size, disk count, memory size, cpu count
       - maximum values for the above metrics
       - and “standard” values (used in ``hspace`` to calculate the standard
         sized instances)
       The minimum/maximum values can be also customised at node-group level,
       for example allowing more powerful hardware to support bigger instance
       memory sizes.
       Beside the instance specs, there are a few other settings belonging to
       the instance policy framework. It is possible now to customise, per
       cluster and node-group:
       - the list of allowed disk templates
       - the maximum ratio of VCPUs per PCPUs (to control CPU oversubscription)
       - the maximum ratio of instance to spindles (see below for more
         information) for local storage
       All these together should allow all tools that talk to Ganeti to know
       what are the ranges of allowed values for instances and the
       over-subscription that is allowed.
       For the VCPU/PCPU ratio, we already have the VCPU configuration from the
       instance configuration, and the physical CPU configuration from the
       node. For the spindle ratios however, we didn't track before these
       values, so new parameters have been added:
       - a new node parameter ``spindle_count``, defaults to 1, customisable at
         node group or node level
       - at new backend parameter (for instances), ``spindle_use`` defaults to 1
       Note that spindles in this context doesn't need to mean actual
       mechanical hard-drives; it's just a relative number for both the node
       I/O capacity and instance I/O consumption.
       Instance migration behaviour
       ++++++++++++++++++++++++++++
       While live-migration is in general desirable over failover, it is
       possible that for some workloads it is actually worse, due to the
       variable time of the “suspend” phase during live migration.
       To allow the tools to work consistently over such instances (without
       having to hard-code instance names), a new backend parameter
       ``always_failover`` has been added to control the migration/failover
       behaviour. When set to True, all migration requests for an instance will
       instead fall-back to failover.
       Instance memory ballooning
       ++++++++++++++++++++++++++
       Initial support for memory ballooning has been added. The memory for an
       instance is no longer fixed (backend parameter ``memory``), but instead
       can vary between minimum and maximum values (backend parameters
       ``minmem`` and ``maxmem``). Currently we only change an instance's
       memory when:
       - live migrating or failing over and instance and the target node
         doesn't have enough memory
       - user requests changing the memory via ``gnt-instance modify
         --runtime-memory``
       Instance CPU pinning
       ++++++++++++++++++++
       In order to control the use of specific CPUs by instance, support for
       controlling CPU pinning has been added for the Xen, HVM and LXC
       hypervisors. This is controlled by a new hypervisor parameter
       ``cpu_mask``; details about possible values for this are in the
       :manpage:`gnt-instance(8)`. Note that use of the most specific (precise
       VCPU-to-CPU mapping) form will work well only when all nodes in your
       cluster have the same amount of CPUs.
       Disk parameters
       +++++++++++++++
       Another area in which Ganeti was not customisable were the parameters
       used for storage configuration, e.g. how many stripes to use for LVM,
       DRBD resync configuration, etc.
       To improve this area, we've added disks parameters, which are
       customisable at cluster and node group level, and which allow to
       specify various parameters for disks (DRBD has the most parameters
       currently), for example:
       - DRBD resync algorithm and parameters (e.g. speed)
       - the default VG for meta-data volumes for DRBD
       - number of stripes for LVM (plain disk template)
       - the RBD pool
       These parameters can be modified via ``gnt-cluster modify -D …`` and
       ``gnt-group modify -D …``, and are used at either instance creation (in
       case of LVM stripes, for example) or at disk “activation” time
       (e.g. resync speed).
       Rados block device support
       ++++++++++++++++++++++++++
       A Rados (http://ceph.com/wiki/Rbd) storage backend has been added,
       denoted by the ``rbd`` disk template type. This is considered
       experimental, feedback is welcome. For details on configuring it, see
       the :doc:`install` document and the :manpage:`gnt-cluster(8)` man page.
       Master IP setup
       +++++++++++++++
       The existing master IP functionality works well only in simple setups (a
       single network shared by all nodes); however, if nodes belong to
       different networks, then the ``/32`` setup and lack of routing
       information is not enough.
       To allow the master IP to function well in more complex cases, the
       system was reworked as follows:
       - a master IP netmask setting has been added
       - the master IP activation/turn-down code was moved from the node daemon
         to a separate script
       - whether to run the Ganeti-supplied master IP script or a user-supplied
         on is a ``gnt-cluster init`` setting
       Details about the location of the standard and custom setup scripts are
       in the man page :manpage:`gnt-cluster(8)`; for information about the
       setup script protocol, look at the Ganeti-supplied script.
       SPICE support
       +++++++++++++
       The `SPICE <http://www.linux-kvm.org/page/SPICE>`_ support has been
       improved.
       It is now possible to use TLS-protected connections, and when renewing
       or changing the cluster certificates (via ``gnt-cluster renew-crypto``,
       it is now possible to specify spice or spice CA certificates. Also, it
       is possible to configure a password for SPICE sessions via the
       hypervisor parameter ``spice_password_file``.
       There are also new parameters to control the compression and streaming
       options (e.g. ``spice_image_compression``, ``spice_streaming_video``,
       etc.). For details, see the man page :manpage:`gnt-instance(8)` and look
       for the spice parameters.
       Lastly, it is now possible to see the SPICE connection information via
       ``gnt-instance console``.
       OVF converter
       +++++++++++++
       A new tool (``tools/ovfconverter``) has been added that supports
       conversion between Ganeti and the `Open Virtualization Format
       <http://en.wikipedia.org/wiki/Open_Virtualization_Format>`_ (both to and
       from).
       This relies on the ``qemu-img`` tool to convert the disk formats, so the
       actual compatibility with other virtualization solutions depends on it.
       Confd daemon changes
       ++++++++++++++++++++
       The configuration query daemon (``ganeti-confd``) is now optional, and
       has been rewritten in Haskell; whether to use the daemon at all, use the
       Python (default) or the Haskell version is selectable at configure time
       via the ``--enable-confd`` parameter, which can take one of the
       ``haskell``, ``python`` or ``no`` values. If not used, disabling the
       daemon will result in a smaller footprint; for larger systems, we
       welcome feedback on the Haskell version which might become the default
       in future versions.
       If you want to use ``gnt-node list-drbd`` you need to have the Haskell
       daemon running. The Python version doesn't implement the new call.
       User interface changes
       ~~~~~~~~~~~~~~~~~~~~~~
       We have replaced the ``--disks`` option of ``gnt-instance
       replace-disks`` with a more flexible ``--disk`` option, which allows
       adding and removing disks at arbitrary indices (Issue 188). Furthermore,
       disk size and mode can be changed upon recreation (via ``gnt-instance
       recreate-disks``, which accepts the same ``--disk`` option).
       As many people are used to a ``show`` command, we have added that as an
       alias to ``info`` on all ``gnt-*`` commands.
       The ``gnt-instance grow-disk`` command has a new mode in which it can
       accept the target size of the disk, instead of the delta; this can be
       more safe since two runs in absolute mode will be idempotent, and
       sometimes it's also easier to specify the desired size directly.
       Also the handling of instances with regard to offline secondaries has
       been improved. Instance operations should not fail because one of it's
       secondary nodes is offline, even though it's safe to proceed.
       A new command ``list-drbd`` has been added to the ``gnt-node`` script to
       support debugging of DRBD issues on nodes. It provides a mapping of DRBD
       minors to instance name.
       API changes
       ~~~~~~~~~~~
       RAPI coverage has improved, with (for example) new resources for
       recreate-disks, node power-cycle, etc.
       Compatibility
       ~~~~~~~~~~~~~
       There is partial support for ``xl`` in the Xen hypervisor; feedback is
       welcome.
       Python 2.7 is better supported, and after Ganeti 2.6 we will investigate
       whether to still support Python 2.4 or move to Python 2.6 as minimum
       required version.
       Support for Fedora has been slightly improved; the provided example
       init.d script should work better on it and the INSTALL file should
       document the needed dependencies.
       Internal changes
       ~~~~~~~~~~~~~~~~
       The deprecated ``QueryLocks`` LUXI request has been removed. Use
       ``Query(what=QR_LOCK, ...)`` instead.
       The LUXI requests :pyeval:`luxi.REQ_QUERY_JOBS`,
       :pyeval:`luxi.REQ_QUERY_INSTANCES`, :pyeval:`luxi.REQ_QUERY_NODES`,
       :pyeval:`luxi.REQ_QUERY_GROUPS`, :pyeval:`luxi.REQ_QUERY_EXPORTS` and
       :pyeval:`luxi.REQ_QUERY_TAGS` are deprecated and will be removed in a
       future version. :pyeval:`luxi.REQ_QUERY` should be used instead.
       RAPI client: ``CertificateError`` now derives from
       ``GanetiApiError``. This should make it more easy to handle Ganeti
       errors.
       Deprecation warnings due to PyCrypto/paramiko import in
       ``tools/setup-ssh`` have been silenced, as usually they are safe; please
       make sure to run an up-to-date paramiko version, if you use this tool.
       The QA scripts now depend on Python 2.5 or above (the main code base
       still works with Python 2.4).
       The configuration file (``config.data``) is now written without
       indentation for performance reasons; if you want to edit it, it can be
       re-formatted via ``tools/fmtjson``.
       A number of bugs has been fixed in the cluster merge tool.
       ``x509`` certification verification (used in import-export) has been
       changed to allow the same clock skew as permitted by the cluster
       verification. This will remove some rare but hard to diagnose errors in
       import-export.
       Version 2.6.0 rc4
       -----------------
       *(Released Thu, 19 Jul 2012)*
       Very few changes from rc4 to the final release, only bugfixes:
       - integrated fixes from release 2.5.2 (fix general boot flag for KVM
         instance, fix CDROM booting for KVM instances)
       - fixed node group modification of node parameters
       - fixed issue in LUClusterVerifyGroup with multi-group clusters
       - fixed generation of bash completion to ensure a stable ordering
       - fixed a few typos
       Version 2.6.0 rc3
       -----------------
       *(Released Fri, 13 Jul 2012)*
       Third release candidate for 2.6. The following changes were done from
       rc3 to rc4:
       - Fixed ``UpgradeConfig`` w.r.t. to disk parameters on disk objects.
       - Fixed an inconsistency in the LUXI protocol with the provided
         arguments (NOT backwards compatible)
       - Fixed a bug with node groups ipolicy where ``min`` was greater than
         the cluster ``std`` value
       - Implemented a new ``gnt-node list-drbd`` call to list DRBD minors for
         easier instance debugging on nodes (requires ``hconfd`` to work)
       Version 2.6.0 rc2
       -----------------
       *(Released Tue, 03 Jul 2012)*
       Second release candidate for 2.6. The following changes were done from
       rc2 to rc3:
       - Fixed ``gnt-cluster verify`` regarding ``master-ip-script`` on non
         master candidates
       - Fixed a RAPI regression on missing beparams/memory
       - Fixed redistribution of files on offline nodes
       - Added possibility to run activate-disks even though secondaries are
         offline. With this change it relaxes also the strictness on some other
         commands which use activate disks internally:
         * ``gnt-instance start|reboot|rename|backup|export``
       - Made it possible to remove safely an instance if its secondaries are
         offline
       - Made it possible to reinstall even though secondaries are offline
       Version 2.6.0 rc1
       -----------------
       *(Released Mon, 25 Jun 2012)*
       First release candidate for 2.6. The following changes were done from
       rc1 to rc2:
       - Fixed bugs with disk parameters and ``rbd`` templates as well as
         ``instance_os_add``
       - Made ``gnt-instance modify`` more consistent regarding new NIC/Disk
         behaviour. It supports now the modify operation
       - ``hcheck`` implemented to analyze cluster health and possibility of
         improving health by rebalance
       - ``hbal`` has been improved in dealing with split instances
       Version 2.6.0 beta2
       -------------------
       *(Released Mon, 11 Jun 2012)*
       Second beta release of 2.6. The following changes were done from beta2
       to rc1:
       - Fixed ``daemon-util`` with non-root user models
       - Fixed creation of plain instances with ``--no-wait-for-sync``
       - Fix wrong iv_names when running ``cfgupgrade``
       - Export more information in RAPI group queries
       - Fixed bug when changing instance network interfaces
       - Extended burnin to do NIC changes
       - query: Added ``<``, ``>``, ``<=``, ``>=`` comparison operators
       - Changed default for DRBD barriers
       - Fixed DRBD error reporting for syncer rate
       - Verify the options on disk parameters
       And of course various fixes to documentation and improved unittests and
       QA.
       Version 2.6.0 beta1
       -------------------
       *(Released Wed, 23 May 2012)*
       First beta release of 2.6. The following changes were done from beta1 to
       beta2:
       - integrated patch for distributions without ``start-stop-daemon``
       - adapted example init.d script to work on Fedora
       - fixed log handling in Haskell daemons
       - adapted checks in the watcher for pycurl linked against libnss
       - add partial support for ``xl`` instead of ``xm`` for Xen
       - fixed a type issue in cluster verification
       - fixed ssconf handling in the Haskell code (was breaking confd in IPv6
         clusters)
       Plus integrated fixes from the 2.5 branch:
       - fixed ``kvm-ifup`` to use ``/bin/bash``
       - fixed parallel build failures
       - KVM live migration when using a custom keymap
       Version 2.5.2
       -------------
       *(Released Tue, 24 Jul 2012)*
       A small bugfix release, with no new features:
       - fixed bash-isms in kvm-ifup, for compatibility with systems which use a
         different default shell (e.g. Debian, Ubuntu)
       - fixed KVM startup and live migration with a custom keymap (fixes Issue
 and Debian bug #650664)
       - fixed compatibility with KVM versions that don't support multiple boot
         devices (fixes Issue 230 and Debian bug #624256)
       Additionally, a few fixes were done to the build system (fixed parallel
       build failures) and to the unittests (fixed race condition in test for
       FileID functions, and the default enable/disable mode for QA test is now
       customisable).
       Version 2.5.1
       -------------
       *(Released Fri, 11 May 2012)*
       A small bugfix release.
       The main issues solved are on the topic of compatibility with newer LVM
       releases:
       - fixed parsing of ``lv_attr`` field
       - adapted to new ``vgreduce --removemissing`` behaviour where sometimes
         the ``--force`` flag is needed
       Also on the topic of compatibility, ``tools/lvmstrap`` has been changed
       to accept kernel 3.x too (was hardcoded to 2.6.*).
       A regression present in 2.5.0 that broke handling (in the gnt-* scripts)
       of hook results and that also made display of other errors suboptimal
       was fixed; the code behaves now like 2.4 and earlier.
       Another change in 2.5, the cleanup of the OS scripts environment, is too
       aggressive: it removed even the ``PATH`` variable, which requires the OS
       scripts to *always* need to export it. Since this is a bit too strict,
       we now export a minimal PATH, the same that we export for hooks.
       The fix for issue 201 (Preserve bridge MTU in KVM ifup script) was
       integrated into this release.
       Finally, a few other miscellaneous changes were done (no new features,
       just small improvements):
       - Fix ``gnt-group --help`` display
       - Fix hardcoded Xen kernel path
       - Fix grow-disk handling of invalid units
       - Update synopsis for ``gnt-cluster repair-disk-sizes``
       - Accept both PUT and POST in noded (makes future upgrade to 2.6 easier)
       Version 2.5.0
       -------------
       *(Released Thu, 12 Apr 2012)*
       Incompatible/important changes and bugfixes
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       - The default of the ``/2/instances/[instance_name]/rename`` RAPI
         resource's ``ip_check`` parameter changed from ``True`` to ``False``
         to match the underlying LUXI interface.
       - The ``/2/nodes/[node_name]/evacuate`` RAPI resource was changed to use
         body parameters, see :doc:`RAPI documentation <rapi>`. The server does
         not maintain backwards-compatibility as the underlying operation
         changed in an incompatible way. The RAPI client can talk to old
         servers, but it needs to be told so as the return value changed.
       - When creating file-based instances via RAPI, the ``file_driver``
         parameter no longer defaults to ``loop`` and must be specified.
       - The deprecated ``bridge`` NIC parameter is no longer supported. Use
         ``link`` instead.
       - Support for the undocumented and deprecated RAPI instance creation
         request format version 0 has been dropped. Use version 1, supported
         since Ganeti 2.1.3 and :doc:`documented <rapi>`, instead.
       - Pyparsing 1.4.6 or above is required, see :doc:`installation
         documentation <install>`.
       - The "cluster-verify" hooks are now executed per group by the
         ``OP_CLUSTER_VERIFY_GROUP`` opcode. This maintains the same behavior
         if you just run ``gnt-cluster verify``, which generates one opcode per
         group.
       - The environment as passed to the OS scripts is cleared, and thus no
         environment variables defined in the node daemon's environment will be
         inherited by the scripts.
       - The :doc:`iallocator <iallocator>` mode ``multi-evacuate`` has been
         deprecated.
       - :doc:`New iallocator modes <design-multi-reloc>` have been added to
         support operations involving multiple node groups.
       - Offline nodes are ignored when failing over an instance.
       - Support for KVM version 1.0, which changed the version reporting format
         from 3 to 2 digits.
       - TCP/IP ports used by DRBD disks are returned to a pool upon instance
         removal.
       - ``Makefile`` is now compatible with Automake 1.11.2
       - Includes all bugfixes made in the 2.4 series
       New features
       ~~~~~~~~~~~~
       - The ganeti-htools project has been merged into the ganeti-core source
         tree and will be built as part of Ganeti (see :doc:`install-quick`).
       - Implemented support for :doc:`shared storage <design-shared-storage>`.
       - Add support for disks larger than 2 TB in ``lvmstrap`` by supporting
         GPT-style partition tables (requires `parted
         <http://www.gnu.org/s/parted/>`_).
       - Added support for floppy drive and 2nd CD-ROM drive in KVM hypervisor.
       - Allowed adding tags on instance creation.
       - Export instance tags to hooks (``INSTANCE_TAGS``, see :doc:`hooks`)
       - Allow instances to be started in a paused state, enabling the user to
         see the complete console output on boot using the console.
       - Added new hypervisor flag to control default reboot behaviour
         (``reboot_behavior``).
       - Added support for KVM keymaps (hypervisor parameter ``keymap``).
       - Improved out-of-band management support:
         - Added ``gnt-node health`` command reporting the health status of
           nodes.
         - Added ``gnt-node power`` command to manage power status of nodes.
         - Added command for emergency power-off (EPO), ``gnt-cluster epo``.
       - Instance migration can fall back to failover if instance is not
         running.
       - Filters can be used when listing nodes, instances, groups and locks;
         see :manpage:`ganeti(7)` manpage.
       - Added post-execution status as variables to :doc:`hooks <hooks>`
         environment.
       - Instance tags are exported/imported together with the instance.
       - When given an explicit job ID, ``gnt-job info`` will work for archived
         jobs.
       - Jobs can define dependencies on other jobs (not yet supported via
         RAPI or command line, but used by internal commands and usable via
         LUXI).
         - Lock monitor (``gnt-debug locks``) shows jobs waiting for
           dependencies.
       - Instance failover is now available as a RAPI resource
         (``/2/instances/[instance_name]/failover``).
       - ``gnt-instance info`` defaults to static information if primary node
         is offline.
       - Opcodes have a new ``comment`` attribute.
       - Added basic SPICE support to KVM hypervisor.
       - ``tools/ganeti-listrunner`` allows passing of arguments to executable.
       Node group improvements
       ~~~~~~~~~~~~~~~~~~~~~~~
       - ``gnt-cluster verify`` has been modified to check groups separately,
         thereby improving performance.
       - Node group support has been added to ``gnt-cluster verify-disks``,
         which now operates per node group.
       - Watcher has been changed to work better with node groups.
         - One process and state file per node group.
         - Slow watcher in one group doesn't block other group's watcher.
       - Added new command, ``gnt-group evacuate``, to move all instances in a
         node group to other groups.
       - Added ``gnt-instance change-group`` to move an instance to another
         node group.
       - ``gnt-cluster command`` and ``gnt-cluster copyfile`` now support
         per-group operations.
       - Node groups can be tagged.
       - Some operations switch from an exclusive to a shared lock as soon as
         possible.
       - Instance's primary and secondary nodes' groups are now available as
         query fields (``pnode.group``, ``pnode.group.uuid``, ``snodes.group``
         and ``snodes.group.uuid``).
       Misc
       ~~~~
       - Numerous updates to documentation and manpages.
         - :doc:`RAPI <rapi>` documentation now has detailed parameter
           descriptions.
         - Some opcode/job results are now also documented, see :doc:`RAPI
           <rapi>`.
       - A lockset's internal lock is now also visible in lock monitor.
       - Log messages from job queue workers now contain information about the
         opcode they're processing.
       - ``gnt-instance console`` no longer requires the instance lock.
       - A short delay when waiting for job changes reduces the number of LUXI
         requests significantly.
       - DRBD metadata volumes are overwritten with zeros during disk creation.
       - Out-of-band commands no longer acquire the cluster lock in exclusive
         mode.
       - ``devel/upload`` now uses correct permissions for directories.
       Version 2.5.0 rc6
       -----------------
       *(Released Fri, 23 Mar 2012)*
       This was the sixth release candidate of the 2.5 series.
       Version 2.5.0 rc5
       -----------------
       *(Released Mon, 9 Jan 2012)*
       This was the fifth release candidate of the 2.5 series.
       Version 2.5.0 rc4
       -----------------
       *(Released Thu, 27 Oct 2011)*
       This was the fourth release candidate of the 2.5 series.
       Version 2.5.0 rc3
       -----------------
       *(Released Wed, 26 Oct 2011)*
       This was the third release candidate of the 2.5 series.
       Version 2.5.0 rc2
       -----------------
       *(Released Tue, 18 Oct 2011)*
       This was the second release candidate of the 2.5 series.
       Version 2.5.0 rc1
       -----------------
       *(Released Tue, 4 Oct 2011)*
       This was the first release candidate of the 2.5 series.
       Version 2.5.0 beta3
       -------------------
       *(Released Wed, 31 Aug 2011)*
       This was the third beta release of the 2.5 series.
       Version 2.5.0 beta2
       -------------------
       *(Released Mon, 22 Aug 2011)*
       This was the second beta release of the 2.5 series.
       Version 2.5.0 beta1
       -------------------
       *(Released Fri, 12 Aug 2011)*
       This was the first beta release of the 2.5 series.
       Version 2.4.5
       -------------
       *(Released Thu, 27 Oct 2011)*
       - Fixed bug when parsing command line parameter values ending in
         backslash
       - Fixed assertion error after unclean master shutdown
       - Disable HTTP client pool for RPC, significantly reducing memory usage
         of master daemon
       - Fixed queue archive creation with wrong permissions
       Version 2.4.4
       -------------
       *(Released Tue, 23 Aug 2011)*
       Small bug-fixes:
       - Fixed documentation for importing with ``--src-dir`` option
       - Fixed a bug in ``ensure-dirs`` with queue/archive permissions
       - Fixed a parsing issue with DRBD 8.3.11 in the Linux kernel
       Version 2.4.3
       -------------
       *(Released Fri, 5 Aug 2011)*
       Many bug-fixes and a few small features:
       - Fixed argument order in ``ReserveLV`` and ``ReserveMAC`` which caused
         issues when you tried to add an instance with two MAC addresses in one
         request
       - KVM: fixed per-instance stored UID value
       - KVM: configure bridged NICs at migration start
       - KVM: Fix a bug where instance will not start with never KVM versions
         (>= 0.14)
       - Added OS search path to ``gnt-cluster info``
       - Fixed an issue with ``file_storage_dir`` where you were forced to
         provide an absolute path, but the documentation states it is a
         relative path, the documentation was right
       - Added a new parameter to instance stop/start called ``--no-remember``
         that will make the state change to not be remembered
       - Implemented ``no_remember`` at RAPI level
       - Improved the documentation
       - Node evacuation: don't call IAllocator if node is already empty
       - Fixed bug in DRBD8 replace disks on current nodes
       - Fixed bug in recreate-disks for DRBD instances
       - Moved assertion checking locks in ``gnt-instance replace-disks``
         causing it to abort with not owning the right locks for some situation
       - Job queue: Fixed potential race condition when cancelling queued jobs
       - Fixed off-by-one bug in job serial generation
       - ``gnt-node volumes``: Fix instance names
       - Fixed aliases in bash completion
       - Fixed a bug in reopening log files after being sent a SIGHUP
       - Added a flag to burnin to allow specifying VCPU count
       - Bugfixes to non-root Ganeti configuration
       Version 2.4.2
       -------------
       *(Released Thu, 12 May 2011)*
       Many bug-fixes and a few new small features:
       - Fixed a bug related to log opening failures
       - Fixed a bug in instance listing with orphan instances
       - Fixed a bug which prevented resetting the cluster-level node parameter
         ``oob_program`` to the default
       - Many fixes related to the ``cluster-merge`` tool
       - Fixed a race condition in the lock monitor, which caused failures
         during (at least) creation of many instances in parallel
       - Improved output for gnt-job info
       - Removed the quiet flag on some ssh calls which prevented debugging
         failures
       - Improved the N+1 failure messages in cluster verify by actually
         showing the memory values (needed and available)
       - Increased lock attempt timeouts so that when executing long operations
         (e.g. DRBD replace-disks) other jobs do not enter 'blocking acquire'
         too early and thus prevent the use of the 'fair' mechanism
       - Changed instance query data (``gnt-instance info``) to not acquire
         locks unless needed, thus allowing its use on locked instance if only
         static information is asked for
       - Improved behaviour with filesystems that do not support rename on an
         opened file
       - Fixed the behaviour of ``prealloc_wipe_disks`` cluster parameter which
         kept locks on all nodes during the wipe, which is unneeded
       - Fixed ``gnt-watcher`` handling of errors during hooks execution
       - Fixed bug in ``prealloc_wipe_disks`` with small disk sizes (less than
 GiB) which caused the wipe to fail right at the end in some cases
       - Fixed master IP activation when doing master failover with no-voting
       - Fixed bug in ``gnt-node add --readd`` which allowed the re-adding of
         the master node itself
       - Fixed potential data-loss in under disk full conditions, where Ganeti
         wouldn't check correctly the return code and would consider
         partially-written files 'correct'
       - Fixed bug related to multiple VGs and DRBD disk replacing
       - Added new disk parameter ``metavg`` that allows placement of the meta
         device for DRBD in a different volume group
       - Fixed error handling in the node daemon when the system libc doesn't
         have major number 6 (i.e. if ``libc.so.6`` is not the actual libc)
       - Fixed lock release during replace-disks, which kept cluster-wide locks
         when doing disk replaces with an iallocator script
       - Added check for missing bridges in cluster verify
       - Handle EPIPE errors while writing to the terminal better, so that
         piping the output to e.g. ``less`` doesn't cause a backtrace
       - Fixed rare case where a ^C during Luxi calls could have been
         interpreted as server errors, instead of simply terminating
       - Fixed a race condition in LUGroupAssignNodes (``gnt-group
         assign-nodes``)
       - Added a few more parameters to the KVM hypervisor, allowing a second
         CDROM, custom disk type for CDROMs and a floppy image
       - Removed redundant message in instance rename when the name is given
         already as a FQDN
       - Added option to ``gnt-instance recreate-disks`` to allow creating the
         disks on new nodes, allowing recreation when the original instance
         nodes are completely gone
       - Added option when converting disk templates to DRBD to skip waiting
         for the resync, in order to make the instance available sooner
       - Added two new variables to the OS scripts environment (containing the
         instance's nodes)
       - Made the root_path and optional parameter for the xen-pvm hypervisor,
         to allow use of ``pvgrub`` as bootloader
       - Changed the instance memory modifications to only check out-of-memory
         conditions on memory increases, and turned the secondary node warnings
         into errors (they can still be overridden via ``--force``)
       - Fixed the handling of a corner case when the Python installation gets
         corrupted (e.g. a bad disk) while ganeti-noded is running and we try
         to execute a command that doesn't exist
       - Fixed a bug in ``gnt-instance move`` (LUInstanceMove) when the primary
         node of the instance returned failures during instance shutdown; this
         adds the option ``--ignore-consistency`` to gnt-instance move
       And as usual, various improvements to the error messages, documentation
       and man pages.
       Version 2.4.1
       -------------
       *(Released Wed, 09 Mar 2011)*
       Emergency bug-fix release. ``tools/cfgupgrade`` was broken and overwrote
       the RAPI users file if run twice (even with ``--dry-run``).
       The release fixes that bug (nothing else changed).
       Version 2.4.0
       -------------
       *(Released Mon, 07 Mar 2011)*
       Final 2.4.0 release. Just a few small fixes:
       - Fixed RAPI node evacuate
       - Fixed the kvm-ifup script
       - Fixed internal error handling for special job cases
       - Updated man page to specify the escaping feature for options
       Version 2.4.0 rc3
       -----------------
       *(Released Mon, 28 Feb 2011)*
       A critical fix for the ``prealloc_wipe_disks`` feature: it is possible
       that this feature wiped the disks of the wrong instance, leading to loss
       of data.
       Other changes:
       - Fixed title of query field containing instance name
       - Expanded the glossary in the documentation
       - Fixed one unittest (internal issue)
       Version 2.4.0 rc2
       -----------------
       *(Released Mon, 21 Feb 2011)*
       A number of bug fixes plus just a couple functionality changes.
       On the user-visible side, the ``gnt-* list`` command output has changed
       with respect to "special" field states. The current rc1 style of display
       can be re-enabled by passing a new ``--verbose`` (``-v``) flag, but in
       the default output mode special fields states are displayed as follows:
       - Offline resource: ``*``
       - Unavailable/not applicable: ``-``
       - Data missing (RPC failure): ``?``
       - Unknown field: ``??``
       Another user-visible change is the addition of ``--force-join`` to
       ``gnt-node add``.
       As for bug fixes:
       - ``tools/cluster-merge`` has seen many fixes and is now enabled again
       - Fixed regression in RAPI/instance reinstall where all parameters were
         required (instead of optional)
       - Fixed ``gnt-cluster repair-disk-sizes``, was broken since Ganeti 2.2
       - Fixed iallocator usage (offline nodes were not considered offline)
       - Fixed ``gnt-node list`` with respect to non-vm_capable nodes
       - Fixed hypervisor and OS parameter validation with respect to
         non-vm_capable nodes
       - Fixed ``gnt-cluster verify`` with respect to offline nodes (mostly
         cosmetic)
       - Fixed ``tools/listrunner`` with respect to agent-based usage
       Version 2.4.0 rc1
       -----------------
       *(Released Fri,  4 Feb 2011)*
       Many changes and fixes since the beta1 release. While there were some
       internal changes, the code has been mostly stabilised for the RC
       release.
       Note: the dumb allocator was removed in this release, as it was not kept
       up-to-date with the IAllocator protocol changes. It is recommended to
       use the ``hail`` command from the ganeti-htools package.
       Note: the 2.4 and up versions of Ganeti are not compatible with the
 .2.x branch of ganeti-htools. You need to upgrade to
       ganeti-htools-0.3.0 (or later).
       Regressions fixed from 2.3
       ~~~~~~~~~~~~~~~~~~~~~~~~~~
       - Fixed the ``gnt-cluster verify-disks`` command
       - Made ``gnt-cluster verify-disks`` work in parallel (as opposed to
         serially on nodes)
       - Fixed disk adoption breakage
       - Fixed wrong headers in instance listing for field aliases
       Other bugs fixed
       ~~~~~~~~~~~~~~~~
       - Fixed corner case in KVM handling of NICs
       - Fixed many cases of wrong handling of non-vm_capable nodes
       - Fixed a bug where a missing instance symlink was not possible to
         recreate with any ``gnt-*`` command (now ``gnt-instance
         activate-disks`` does it)
       - Fixed the volume group name as reported by ``gnt-cluster
         verify-disks``
       - Increased timeouts for the import-export code, hopefully leading to
         fewer aborts due network or instance timeouts
       - Fixed bug in ``gnt-node list-storage``
       - Fixed bug where not all daemons were started on cluster
         initialisation, but only at the first watcher run
       - Fixed many bugs in the OOB implementation
       - Fixed watcher behaviour in presence of instances with offline
         secondaries
       - Fixed instance list output for instances running on the wrong node
       - a few fixes to the cluster-merge tool, but it still cannot merge
         multi-node groups (currently it is not recommended to use this tool)
       Improvements
       ~~~~~~~~~~~~
       - Improved network configuration for the KVM hypervisor
       - Added e1000 as a supported NIC for Xen-HVM
       - Improved the lvmstrap tool to also be able to use partitions, as
         opposed to full disks
       - Improved speed of disk wiping (the cluster parameter
         ``prealloc_wipe_disks``, so that it has a low impact on the total time
         of instance creations
       - Added documentation for the OS parameters
       - Changed ``gnt-instance deactivate-disks`` so that it can work if the
         hypervisor is not responding
       - Added display of blacklisted and hidden OS information in
         ``gnt-cluster info``
       - Extended ``gnt-cluster verify`` to also validate hypervisor, backend,
         NIC and node parameters, which might create problems with currently
         invalid (but undetected) configuration files, but prevents validation
         failures when unrelated parameters are modified
       - Changed cluster initialisation to wait for the master daemon to become
         available
       - Expanded the RAPI interface:
         - Added config redistribution resource
         - Added activation/deactivation of instance disks
         - Added export of console information
       - Implemented log file reopening on SIGHUP, which allows using
         logrotate(8) for the Ganeti log files
       - Added a basic OOB helper script as an example
       Version 2.4.0 beta1
       -------------------
       *(Released Fri, 14 Jan 2011)*
       User-visible
       ~~~~~~~~~~~~
       - Fixed timezone issues when formatting timestamps
       - Added support for node groups, available via ``gnt-group`` and other
         commands
       - Added out-of-band framework and management, see :doc:`design
         document <design-oob>`
       - Removed support for roman numbers from ``gnt-node list`` and
         ``gnt-instance list``.
       - Allowed modification of master network interface via ``gnt-cluster
         modify --master-netdev``
       - Accept offline secondaries while shutting down instance disks
       - Added ``blockdev_prefix`` parameter to Xen PVM and HVM hypervisors
       - Added support for multiple LVM volume groups
       - Avoid sorting nodes for ``gnt-node list`` if specific nodes are
         requested
       - Added commands to list available fields:
         - ``gnt-node list-fields``
         - ``gnt-group list-fields``
         - ``gnt-instance list-fields``
       - Updated documentation and man pages
       Integration
       ~~~~~~~~~~~
       - Moved ``rapi_users`` file into separate directory, now named
         ``.../ganeti/rapi/users``, ``cfgupgrade`` moves the file and creates a
         symlink
       - Added new tool for running commands on many machines,
         ``tools/ganeti-listrunner``
       - Implemented more verbose result in ``OpInstanceConsole`` opcode, also
         improving the ``gnt-instance console`` output
       - Allowed customisation of disk index separator at ``configure`` time
       - Export node group allocation policy to :doc:`iallocator <iallocator>`
       - Added support for non-partitioned md disks in ``lvmstrap``
       - Added script to gracefully power off KVM instances
       - Split ``utils`` module into smaller parts
       - Changed query operations to return more detailed information, e.g.
         whether an information is unavailable due to an offline node. To use
         this new functionality, the LUXI call ``Query`` must be used. Field
         information is now stored by the master daemon and can be retrieved
         using ``QueryFields``. Instances, nodes and groups can also be queried
         using the new opcodes ``OpQuery`` and ``OpQueryFields`` (not yet
         exposed via RAPI). The following commands make use of this
         infrastructure change:
         - ``gnt-group list``
         - ``gnt-group list-fields``
         - ``gnt-node list``
         - ``gnt-node list-fields``
         - ``gnt-instance list``
         - ``gnt-instance list-fields``
         - ``gnt-debug locks``
       Remote API
       ~~~~~~~~~~
       - New RAPI resources (see :doc:`rapi`):
         - ``/2/modify``
         - ``/2/groups``
         - ``/2/groups/[group_name]``
         - ``/2/groups/[group_name]/assign-nodes``
         - ``/2/groups/[group_name]/modify``
         - ``/2/groups/[group_name]/rename``
         - ``/2/instances/[instance_name]/disk/[disk_index]/grow``
       - RAPI changes:
         - Implemented ``no_install`` for instance creation
         - Implemented OS parameters for instance reinstallation, allowing
           use of special settings on reinstallation (e.g. for preserving data)
       Misc
       ~~~~
       - Added IPv6 support in import/export
       - Pause DRBD synchronization while wiping disks on instance creation
       - Updated unittests and QA scripts
       - Improved network parameters passed to KVM
       - Converted man pages from docbook to reStructuredText
       Version 2.3.1
       -------------
       *(Released Mon, 20 Dec 2010)*
       Released version 2.3.1~rc1 without any changes.
       Version 2.3.1 rc1
       -----------------
       *(Released Wed, 1 Dec 2010)*
       - impexpd: Disable OpenSSL compression in socat if possible (backport
         from master, commit e90739d625b, see :doc:`installation guide
         <install-quick>` for details)
       - Changed unittest coverage report to exclude test scripts
       - Added script to check version format
       Version 2.3.0
       -------------
       *(Released Wed, 1 Dec 2010)*
       Released version 2.3.0~rc1 without any changes.
       Version 2.3.0 rc1
       -----------------
       *(Released Fri, 19 Nov 2010)*
       A number of bugfixes and documentation updates:
       - Update ganeti-os-interface documentation
       - Fixed a bug related to duplicate MACs or similar items which should be
         unique
       - Fix breakage in OS state modify
       - Reinstall instance: disallow offline secondaries (fixes bug related to
         OS changing but reinstall failing)
       - plus all the other fixes between 2.2.1 and 2.2.2
       Version 2.3.0 rc0
       -----------------
       *(Released Tue, 2 Nov 2010)*
       - Fixed clearing of the default iallocator using ``gnt-cluster modify``
       - Fixed master failover race with watcher
       - Fixed a bug in ``gnt-node modify`` which could lead to an inconsistent
         configuration
       - Accept previously stopped instance for export with instance removal
       - Simplify and extend the environment variables for instance OS scripts
       - Added new node flags, ``master_capable`` and ``vm_capable``
       - Added optional instance disk wiping prior during allocation. This is a
         cluster-wide option and can be set/modified using
         ``gnt-cluster {init,modify} --prealloc-wipe-disks``.
       - Added IPv6 support, see :doc:`design document <design-2.3>` and
         :doc:`install-quick`
       - Added a new watcher option (``--ignore-pause``)
       - Added option to ignore offline node on instance start/stop
         (``--ignore-offline``)
       - Allow overriding OS parameters with ``gnt-instance reinstall``
       - Added ability to change node's secondary IP address using ``gnt-node
         modify``
       - Implemented privilege separation for all daemons except
         ``ganeti-noded``, see ``configure`` options
       - Complain if an instance's disk is marked faulty in ``gnt-cluster
         verify``
       - Implemented job priorities (see ``ganeti(7)`` manpage)
       - Ignore failures while shutting down instances during failover from
         offline node
       - Exit daemon's bootstrap process only once daemon is ready
       - Export more information via ``LUInstanceQuery``/remote API
       - Improved documentation, QA and unittests
       - RAPI daemon now watches ``rapi_users`` all the time and doesn't need a
         restart if the file was created or changed
       - Added LUXI protocol version sent with each request and response,
         allowing detection of server/client mismatches
       - Moved the Python scripts among gnt-* and ganeti-* into modules
       - Moved all code related to setting up SSH to an external script,
         ``setup-ssh``
       - Infrastructure changes for node group support in future versions
       Version 2.2.2
       -------------
       *(Released Fri, 19 Nov 2010)*
       A few small bugs fixed, and some improvements to the build system:
       - Fix documentation regarding conversion to drbd
       - Fix validation of parameters in cluster modify (``gnt-cluster modify
         -B``)
       - Fix error handling in node modify with multiple changes
       - Allow remote imports without checked names
       Version 2.2.1
       -------------
       *(Released Tue, 19 Oct 2010)*
       - Disable SSL session ID cache in RPC client
       Version 2.2.1 rc1
       -----------------
       *(Released Thu, 14 Oct 2010)*
       - Fix interaction between Curl/GnuTLS and the Python's HTTP server
         (thanks Apollon Oikonomopoulos!), finally allowing the use of Curl
         with GnuTLS
       - Fix problems with interaction between Curl and Python's HTTP server,
         resulting in increased speed in many RPC calls
       - Improve our release script to prevent breakage with older aclocal and
         Python 2.6
       Version 2.2.1 rc0
       -----------------
       *(Released Thu, 7 Oct 2010)*
       - Fixed issue 125, replace hardcoded "xenvg" in ``gnt-cluster`` with
         value retrieved from master
       - Added support for blacklisted or hidden OS definitions
       - Added simple lock monitor (accessible via (``gnt-debug locks``)
       - Added support for -mem-path in KVM hypervisor abstraction layer
       - Allow overriding instance parameters in tool for inter-cluster
         instance moves (``tools/move-instance``)
       - Improved opcode summaries (e.g. in ``gnt-job list``)
       - Improve consistency of OS listing by sorting it
       - Documentation updates
       Version 2.2.0.1
       ---------------
       *(Released Fri, 8 Oct 2010)*
       - Rebuild with a newer autotools version, to fix python 2.6 compatibility
       Version 2.2.0
       -------------
       *(Released Mon, 4 Oct 2010)*
       - Fixed regression in ``gnt-instance rename``
       Version 2.2.0 rc2
       -----------------
       *(Released Wed, 22 Sep 2010)*
       - Fixed OS_VARIANT variable for OS scripts
       - Fixed cluster tag operations via RAPI
       - Made ``setup-ssh`` exit with non-zero code if an error occurred
       - Disabled RAPI CA checks in watcher
       Version 2.2.0 rc1
       -----------------
       *(Released Mon, 23 Aug 2010)*
       - Support DRBD versions of the format "a.b.c.d"
       - Updated manpages
       - Re-introduce support for usage from multiple threads in RAPI client
       - Instance renames and modify via RAPI
       - Work around race condition between processing and archival in job
         queue
       - Mark opcodes following failed one as failed, too
       - Job field ``lock_status`` was removed due to difficulties making it
         work with the changed job queue in Ganeti 2.2; a better way to monitor
         locks is expected for a later 2.2.x release
       - Fixed dry-run behaviour with many commands
       - Support ``ssh-agent`` again when adding nodes
       - Many additional bugfixes
       Version 2.2.0 rc0
       -----------------
       *(Released Fri, 30 Jul 2010)*
       Important change: the internal RPC mechanism between Ganeti nodes has
       changed from using a home-grown http library (based on the Python base
       libraries) to use the PycURL library. This requires that PycURL is
       installed on nodes. Please note that on Debian/Ubuntu, PycURL is linked
       against GnuTLS by default. cURL's support for GnuTLS had known issues
       before cURL 7.21.0 and we recommend using the latest cURL release or
       linking against OpenSSL. Most other distributions already link PycURL
       and cURL against OpenSSL. The command::
         python -c 'import pycurl; print pycurl.version'
       can be used to determine the libraries PycURL and cURL are linked
       against.
       Other significant changes:
       - Rewrote much of the internals of the job queue, in order to achieve
         better parallelism; this decouples job query operations from the job
         processing, and it should allow much nicer behaviour of the master
         daemon under load, and it also has uncovered some long-standing bugs
         related to the job serialisation (now fixed)
       - Added a default iallocator setting to the cluster parameters,
         eliminating the need to always pass nodes or an iallocator for
         operations that require selection of new node(s)
       - Added experimental support for the LXC virtualization method
       - Added support for OS parameters, which allows the installation of
         instances to pass parameter to OS scripts in order to customise the
         instance
       - Added a hypervisor parameter controlling the migration type (live or
         non-live), since hypervisors have various levels of reliability; this
         has renamed the 'live' parameter to 'mode'
       - Added a cluster parameter ``reserved_lvs`` that denotes reserved
         logical volumes, meaning that cluster verify will ignore them and not
         flag their presence as errors
       - The watcher will now reset the error count for failed instances after
 hours, thus allowing self-healing if the problem that caused the
         instances to be down/fail to start has cleared in the meantime
       - Added a cluster parameter ``drbd_usermode_helper`` that makes Ganeti
         check for, and warn, if the drbd module parameter ``usermode_helper``
         is not consistent with the cluster-wide setting; this is needed to
         make diagnose easier of failed drbd creations
       - Started adding base IPv6 support, but this is not yet
         enabled/available for use
       - Rename operations (cluster, instance) will now return the new name,
         which is especially useful if a short name was passed in
       - Added support for instance migration in RAPI
       - Added a tool to pre-configure nodes for the SSH setup, before joining
         them to the cluster; this will allow in the future a simplified model
         for node joining (but not yet fully enabled in 2.2); this needs the
         paramiko python library
       - Fixed handling of name-resolving errors
       - Fixed consistency of job results on the error path
       - Fixed master-failover race condition when executed multiple times in
         sequence
       - Fixed many bugs related to the job queue (mostly introduced during the
 .2 development cycle, so not all are impacting 2.1)
       - Fixed instance migration with missing disk symlinks
       - Fixed handling of unknown jobs in ``gnt-job archive``
       - And many other small fixes/improvements
       Internal changes:
       - Enhanced both the unittest and the QA coverage
       - Switched the opcode validation to a generic model, and extended the
         validation to all opcode parameters
       - Changed more parts of the code that write shell scripts to use the
         same class for this
       - Switched the master daemon to use the asyncore library for the Luxi
         server endpoint
       Version 2.2.0 beta0
       -------------------
       *(Released Thu, 17 Jun 2010)*
       - Added tool (``move-instance``) and infrastructure to move instances
         between separate clusters (see :doc:`separate documentation
         <move-instance>` and :doc:`design document <design-2.2>`)
       - Added per-request RPC timeout
       - RAPI now requires a Content-Type header for requests with a body (e.g.
         ``PUT`` or ``POST``) which must be set to ``application/json`` (see
         :rfc:`2616` (HTTP/1.1), section 7.2.1)
       - ``ganeti-watcher`` attempts to restart ``ganeti-rapi`` if RAPI is not
         reachable
       - Implemented initial support for running Ganeti daemons as separate
         users, see configure-time flags ``--with-user-prefix`` and
         ``--with-group-prefix`` (only ``ganeti-rapi`` is supported at this
         time)
       - Instances can be removed after export (``gnt-backup export
         --remove-instance``)
       - Self-signed certificates generated by Ganeti now use a 2048 bit RSA
         key (instead of 1024 bit)
       - Added new cluster configuration file for cluster domain secret
       - Import/export now use SSL instead of SSH
       - Added support for showing estimated time when exporting an instance,
         see the ``ganeti-os-interface(7)`` manpage and look for
         ``EXP_SIZE_FD``
       Version 2.1.8
       -------------
       *(Released Tue, 16 Nov 2010)*
       Some more bugfixes. Unless critical bugs occur, this will be the last
 .1 release:
       - Fix case of MAC special-values
       - Fix mac checker regex
       - backend: Fix typo causing "out of range" error
       - Add missing --units in gnt-instance list man page
       Version 2.1.7
       -------------
       *(Released Tue, 24 Aug 2010)*
       Bugfixes only:
         - Don't ignore secondary node silently on non-mirrored disk templates
           (issue 113)
         - Fix --master-netdev arg name in gnt-cluster(8) (issue 114)
         - Fix usb_mouse parameter breaking with vnc_console (issue 109)
         - Properly document the usb_mouse parameter
         - Fix path in ganeti-rapi(8) (issue 116)
         - Adjust error message when the ganeti user's .ssh directory is
           missing
         - Add same-node-check when changing the disk template to drbd
       Version 2.1.6
       -------------
       *(Released Fri, 16 Jul 2010)*
       Bugfixes only:
         - Add an option to only select some reboot types during qa/burnin.
           (on some hypervisors consequent reboots are not supported)
         - Fix infrequent race condition in master failover. Sometimes the old
           master ip address would be still detected as up for a short time
           after it was removed, causing failover to fail.
         - Decrease mlockall warnings when the ctypes module is missing. On
           Python 2.4 we support running even if no ctypes module is installed,
           but we were too verbose about this issue.
         - Fix building on old distributions, on which man doesn't have a
           --warnings option.
         - Fix RAPI not to ignore the MAC address on instance creation
         - Implement the old instance creation format in the RAPI client.
       Version 2.1.5
       -------------
       *(Released Thu, 01 Jul 2010)*
       A small bugfix release:
         - Fix disk adoption: broken by strict --disk option checking in 2.1.4
         - Fix batch-create: broken in the whole 2.1 series due to a lookup on
           a non-existing option
         - Fix instance create: the --force-variant option was ignored
         - Improve pylint 0.21 compatibility and warnings with Python 2.6
         - Fix modify node storage with non-FQDN arguments
         - Fix RAPI client to authenticate under Python 2.6 when used
           for more than 5 requests needing authentication
         - Fix gnt-instance modify -t (storage) giving a wrong error message
           when converting a non-shutdown drbd instance to plain
       Version 2.1.4
       -------------
       *(Released Fri, 18 Jun 2010)*
       A small bugfix release:
         - Fix live migration of KVM instances started with older Ganeti
           versions which had fewer hypervisor parameters
         - Fix gnt-instance grow-disk on down instances
         - Fix an error-reporting bug during instance migration
         - Better checking of the ``--net`` and ``--disk`` values, to avoid
           silently ignoring broken ones
         - Fix an RPC error reporting bug affecting, for example, RAPI client
           users
         - Fix bug triggered by different API version os-es on different nodes
         - Fix a bug in instance startup with custom hvparams: OS level
           parameters would fail to be applied.
         - Fix the RAPI client under Python 2.6 (but more work is needed to
           make it work completely well with OpenSSL)
         - Fix handling of errors when resolving names from DNS
       Version 2.1.3
       -------------
       *(Released Thu, 3 Jun 2010)*
       A medium sized development cycle. Some new features, and some
       fixes/small improvements/cleanups.
       Significant features
       ~~~~~~~~~~~~~~~~~~~~
       The node deamon now tries to mlock itself into memory, unless the
       ``--no-mlock`` flag is passed. It also doesn't fail if it can't write
       its logs, and falls back to console logging. This allows emergency
       features such as ``gnt-node powercycle`` to work even in the event of a
       broken node disk (tested offlining the disk hosting the node's
       filesystem and dropping its memory caches; don't try this at home)
       KVM: add vhost-net acceleration support. It can be tested with a new
       enough version of the kernel and of qemu-kvm.
       KVM: Add instance chrooting feature. If you use privilege dropping for
       your VMs you can also now force them to chroot to an empty directory,
       before starting the emulated guest.
       KVM: Add maximum migration bandwith and maximum downtime tweaking
       support (requires a new-enough version of qemu-kvm).
       Cluster verify will now warn if the master node doesn't have the master
       ip configured on it.
       Add a new (incompatible) instance creation request format to RAPI which
       supports all parameters (previously only a subset was supported, and it
       wasn't possible to extend the old format to accomodate all the new
       features. The old format is still supported, and a client can check for
       this feature, before using it, by checking for its presence in the
       ``features`` RAPI resource.
       Now with ancient latin support. Try it passing the ``--roman`` option to
       ``gnt-instance info``, ``gnt-cluster info`` or ``gnt-node list``
       (requires the python-roman module to be installed, in order to work).
       Other changes
       ~~~~~~~~~~~~~
       As usual many internal code refactorings, documentation updates, and
       such. Among others:
         - Lots of improvements and cleanups to the experimental Remote API
           (RAPI) client library.
         - A new unit test suite for the core daemon libraries.
         - A fix to creating missing directories makes sure the umask is not
           applied anymore. This enforces the same directory permissions
           everywhere.
         - Better handling terminating daemons with ctrl+c (used when running
           them in debugging mode).
         - Fix a race condition in live migrating a KVM instance, when stat()
           on the old proc status file returned EINVAL, which is an unexpected
           value.
         - Fixed manpage checking with newer man and utf-8 charachters. But now
           you need the en_US.UTF-8 locale enabled to build Ganeti from git.
       Version 2.1.2.1
       ---------------
       *(Released Fri, 7 May 2010)*
       Fix a bug which prevented untagged KVM instances from starting.
       Version 2.1.2
       -------------
       *(Released Fri, 7 May 2010)*
       Another release with a long development cycle, during which many
       different features were added.
       Significant features
       ~~~~~~~~~~~~~~~~~~~~
       The KVM hypervisor now can run the individual instances as non-root, to
       reduce the impact of a VM being hijacked due to bugs in the
       hypervisor. It is possible to run all instances as a single (non-root)
       user, to manually specify a user for each instance, or to dynamically
       allocate a user out of a cluster-wide pool to each instance, with the
       guarantee that no two instances will run under the same user ID on any
       given node.
       An experimental RAPI client library, that can be used standalone
       (without the other Ganeti libraries), is provided in the source tree as
       ``lib/rapi/client.py``. Note this client might change its interface in
       the future, as we iterate on its capabilities.
       A new command, ``gnt-cluster renew-crypto`` has been added to easily
       replace the cluster's certificates and crypto keys. This might help in
       case they have been compromised, or have simply expired.
       A new disk option for instance creation has been added that allows one
       to "adopt" currently existing logical volumes, with data
       preservation. This should allow easier migration to Ganeti from
       unmanaged (or managed via other software) instances.
       Another disk improvement is the possibility to convert between redundant
       (DRBD) and plain (LVM) disk configuration for an instance. This should
       allow better scalability (starting with one node and growing the
       cluster, or shrinking a two-node cluster to one node).
       A new feature that could help with automated node failovers has been
       implemented: if a node sees itself as offline (by querying the master
       candidates), it will try to shutdown (hard) all instances and any active
       DRBD devices. This reduces the risk of duplicate instances if an
       external script automatically failovers the instances on such nodes. To
       enable this, the cluster parameter ``maintain_node_health`` should be
       enabled; in the future this option (per the name) will enable other
       automatic maintenance features.
       Instance export/import now will reuse the original instance
       specifications for all parameters; that means exporting an instance,
       deleting it and the importing it back should give an almost identical
       instance. Note that the default import behaviour has changed from
       before, where it created only one NIC; now it recreates the original
       number of NICs.
       Cluster verify has added a few new checks: SSL certificates validity,
       /etc/hosts consistency across the cluster, etc.
       Other changes
       ~~~~~~~~~~~~~
       As usual, many internal changes were done, documentation fixes,
       etc. Among others:
       - Fixed cluster initialization with disabled cluster storage (regression
         introduced in 2.1.1)
       - File-based storage supports growing the disks
       - Fixed behaviour of node role changes
       - Fixed cluster verify for some corner cases, plus a general rewrite of
         cluster verify to allow future extension with more checks
       - Fixed log spamming by watcher and node daemon (regression introduced
         in 2.1.1)
       - Fixed possible validation issues when changing the list of enabled
         hypervisors
       - Fixed cleanup of /etc/hosts during node removal
       - Fixed RAPI response for invalid methods
       - Fixed bug with hashed passwords in ``ganeti-rapi`` daemon
       - Multiple small improvements to the KVM hypervisor (VNC usage, booting
         from ide disks, etc.)
       - Allow OS changes without re-installation (to record a changed OS
         outside of Ganeti, or to allow OS renames)
       - Allow instance creation without OS installation (useful for example if
         the OS will be installed manually, or restored from a backup not in
         Ganeti format)
       - Implemented option to make cluster ``copyfile`` use the replication
         network
       - Added list of enabled hypervisors to ssconf (possibly useful for
         external scripts)
       - Added a new tool (``tools/cfgupgrade12``) that allows upgrading from
 .2 clusters
       - A partial form of node re-IP is possible via node readd, which now
         allows changed node primary IP
       - Command line utilities now show an informational message if the job is
         waiting for a lock
       - The logs of the master daemon now show the PID/UID/GID of the
         connected client
       Version 2.1.1
       -------------
       *(Released Fri, 12 Mar 2010)*
       During the 2.1.0 long release candidate cycle, a lot of improvements and
       changes have accumulated with were released later as 2.1.1.
       Major changes
       ~~~~~~~~~~~~~
       The node evacuate command (``gnt-node evacuate``) was significantly
       rewritten, and as such the IAllocator protocol was changed - a new
       request type has been added. This unfortunate change during a stable
       series is designed to improve performance of node evacuations; on
       clusters with more than about five nodes and which are well-balanced,
       evacuation should proceed in parallel for all instances of the node
       being evacuated. As such, any existing IAllocator scripts need to be
       updated, otherwise the above command will fail due to the unknown
       request. The provided "dumb" allocator has not been updated; but the
       ganeti-htools package supports the new protocol since version 0.2.4.
       Another important change is increased validation of node and instance
       names. This might create problems in special cases, if invalid host
       names are being used.
       Also, a new layer of hypervisor parameters has been added, that sits at
       OS level between the cluster defaults and the instance ones. This allows
       customisation of virtualization parameters depending on the installed
       OS. For example instances with OS 'X' may have a different KVM kernel
       (or any other parameter) than the cluster defaults. This is intended to
       help managing a multiple OSes on the same cluster, without manual
       modification of each instance's parameters.
       A tool for merging clusters, ``cluster-merge``, has been added in the
       tools sub-directory.
       Bug fixes
       ~~~~~~~~~
       - Improved the int/float conversions that should make the code more
         robust in face of errors from the node daemons
       - Fixed the remove node code in case of internal configuration errors
       - Fixed the node daemon behaviour in face of inconsistent queue
         directory (e.g. read-only file-system where we can't open the files
         read-write, etc.)
       - Fixed the behaviour of gnt-node modify for master candidate demotion;
         now it either aborts cleanly or, if given the new "auto_promote"
         parameter, will automatically promote other nodes as needed
       - Fixed compatibility with (unreleased yet) Python 2.6.5 that would
         completely prevent Ganeti from working
       - Fixed bug for instance export when not all disks were successfully
         exported
       - Fixed behaviour of node add when the new node is slow in starting up
         the node daemon
       - Fixed handling of signals in the LUXI client, which should improve
         behaviour of command-line scripts
       - Added checks for invalid node/instance names in the configuration (now
         flagged during cluster verify)
       - Fixed watcher behaviour for disk activation errors
       - Fixed two potentially endless loops in http library, which led to the
         RAPI daemon hanging and consuming 100% CPU in some cases
       - Fixed bug in RAPI daemon related to hashed passwords
       - Fixed bug for unintended qemu-level bridging of multi-NIC KVM
         instances
       - Enhanced compatibility with non-Debian OSes, but not using absolute
         path in some commands and allowing customisation of the ssh
         configuration directory
       - Fixed possible future issue with new Python versions by abiding to the
         proper use of ``__slots__`` attribute on classes
       - Added checks that should prevent directory traversal attacks
       - Many documentation fixes based on feedback from users
       New features
       ~~~~~~~~~~~~
       - Added an "early_release" more for instance replace disks and node
         evacuate, where we release locks earlier and thus allow higher
         parallelism within the cluster
       - Added watcher hooks, intended to allow the watcher to restart other
         daemons (e.g. from the ganeti-nbma project), but they can be used of
         course for any other purpose
       - Added a compile-time disable for DRBD barriers, to increase
         performance if the administrator trusts the power supply or the
         storage system to not lose writes
       - Added the option of using syslog for logging instead of, or in
         addition to, Ganeti's own log files
       - Removed boot restriction for paravirtual NICs for KVM, recent versions
         can indeed boot from a paravirtual NIC
       - Added a generic debug level for many operations; while this is not
         used widely yet, it allows one to pass the debug value all the way to
         the OS scripts
       - Enhanced the hooks environment for instance moves (failovers,
         migrations) where the primary/secondary nodes changed during the
         operation, by adding {NEW,OLD}_{PRIMARY,SECONDARY} vars
       - Enhanced data validations for many user-supplied values; one important
         item is the restrictions imposed on instance and node names, which
         might reject some (invalid) host names
       - Add a configure-time option to disable file-based storage, if it's not
         needed; this allows greater security separation between the master
         node and the other nodes from the point of view of the inter-node RPC
         protocol
       - Added user notification in interactive tools if job is waiting in the
         job queue or trying to acquire locks
       - Added log messages when a job is waiting for locks
       - Added filtering by node tags in instance operations which admit
         multiple instances (start, stop, reboot, reinstall)
       - Added a new tool for cluster mergers, ``cluster-merge``
       - Parameters from command line which are of the form ``a=b,c=d`` can now
         use backslash escapes to pass in values which contain commas,
         e.g. ``a=b\\c,d=e`` where the 'a' parameter would get the value
         ``b,c``
       - For KVM, the instance name is the first parameter passed to KVM, so
         that it's more visible in the process list
       Version 2.1.0
       -------------
       *(Released Tue, 2 Mar 2010)*
       Ganeti 2.1 brings many improvements with it. Major changes:
       - Added infrastructure to ease automated disk repairs
       - Added new daemon to export configuration data in a cheaper way than
         using the remote API
       - Instance NICs can now be routed instead of being associated with a
         networking bridge
       - Improved job locking logic to reduce impact of jobs acquiring multiple
         locks waiting for other long-running jobs
       In-depth implementation details can be found in the Ganeti 2.1 design
       document.
       Details
       ~~~~~~~
       - Added chroot hypervisor
       - Added more options to xen-hvm hypervisor (``kernel_path`` and
         ``device_model``)
       - Added more options to xen-pvm hypervisor (``use_bootloader``,
         ``bootloader_path`` and ``bootloader_args``)
       - Added the ``use_localtime`` option for the xen-hvm and kvm
         hypervisors, and the default value for this has changed to false (in
 .0 xen-hvm always enabled it)
       - Added luxi call to submit multiple jobs in one go
       - Added cluster initialization option to not modify ``/etc/hosts``
         file on nodes
       - Added network interface parameters
       - Added dry run mode to some LUs
       - Added RAPI resources:
         - ``/2/instances/[instance_name]/info``
         - ``/2/instances/[instance_name]/replace-disks``
         - ``/2/nodes/[node_name]/evacuate``
         - ``/2/nodes/[node_name]/migrate``
         - ``/2/nodes/[node_name]/role``
         - ``/2/nodes/[node_name]/storage``
         - ``/2/nodes/[node_name]/storage/modify``
         - ``/2/nodes/[node_name]/storage/repair``
       - Added OpCodes to evacuate or migrate all instances on a node
       - Added new command to list storage elements on nodes (``gnt-node
         list-storage``) and modify them (``gnt-node modify-storage``)
       - Added new ssconf files with master candidate IP address
         (``ssconf_master_candidates_ips``), node primary IP address
         (``ssconf_node_primary_ips``) and node secondary IP address
         (``ssconf_node_secondary_ips``)
       - Added ``ganeti-confd`` and a client library to query the Ganeti
         configuration via UDP
       - Added ability to run hooks after cluster initialization and before
         cluster destruction
       - Added automatic mode for disk replace (``gnt-instance replace-disks
         --auto``)
       - Added ``gnt-instance recreate-disks`` to re-create (empty) disks
         after catastrophic data-loss
       - Added ``gnt-node repair-storage`` command to repair damaged LVM volume
         groups
       - Added ``gnt-instance move`` command to move instances
       - Added ``gnt-cluster watcher`` command to control watcher
       - Added ``gnt-node powercycle`` command to powercycle nodes
       - Added new job status field ``lock_status``
       - Added parseable error codes to cluster verification (``gnt-cluster
         verify --error-codes``) and made output less verbose (use
         ``--verbose`` to restore previous behaviour)
       - Added UUIDs to the main config entities (cluster, nodes, instances)
       - Added support for OS variants
       - Added support for hashed passwords in the Ganeti remote API users file
         (``rapi_users``)
       - Added option to specify maximum timeout on instance shutdown
       - Added ``--no-ssh-init`` option to ``gnt-cluster init``
       - Added new helper script to start and stop Ganeti daemons
         (``daemon-util``), with the intent to reduce the work necessary to
         adjust Ganeti for non-Debian distributions and to start/stop daemons
         from one place
       - Added more unittests
       - Fixed critical bug in ganeti-masterd startup
       - Removed the configure-time ``kvm-migration-port`` parameter, this is
         now customisable at the cluster level for both the KVM and Xen
         hypervisors using the new ``migration_port`` parameter
       - Pass ``INSTANCE_REINSTALL`` variable to OS installation script when
         reinstalling an instance
       - Allowed ``@`` in tag names
       - Migrated to Sphinx (http://sphinx.pocoo.org/) for documentation
       - Many documentation updates
       - Distribute hypervisor files on ``gnt-cluster redist-conf``
       - ``gnt-instance reinstall`` can now reinstall multiple instances
       - Updated many command line parameters
       - Introduced new OS API version 15
       - No longer support a default hypervisor
       - Treat virtual LVs as inexistent
       - Improved job locking logic to reduce lock contention
       - Match instance and node names case insensitively
       - Reimplemented bash completion script to be more complete
       - Improved burnin
       Version 2.0.6
       -------------
       *(Released Thu, 4 Feb 2010)*
       - Fix cleaner behaviour on nodes not in a cluster (Debian bug 568105)
       - Fix a string formatting bug
       - Improve safety of the code in some error paths
       - Improve data validation in the master of values returned from nodes
       Version 2.0.5
       -------------
       *(Released Thu, 17 Dec 2009)*
       - Fix security issue due to missing validation of iallocator names; this
         allows local and remote execution of arbitrary executables
       - Fix failure of gnt-node list during instance removal
       - Ship the RAPI documentation in the archive
       Version 2.0.4
       -------------
       *(Released Wed, 30 Sep 2009)*
       - Fixed many wrong messages
       - Fixed a few bugs related to the locking library
       - Fixed MAC checking at instance creation time
       - Fixed a DRBD parsing bug related to gaps in /proc/drbd
       - Fixed a few issues related to signal handling in both daemons and
         scripts
       - Fixed the example startup script provided
       - Fixed insserv dependencies in the example startup script (patch from
         Debian)
       - Fixed handling of drained nodes in the iallocator framework
       - Fixed handling of KERNEL_PATH parameter for xen-hvm (Debian bug
         #528618)
       - Fixed error related to invalid job IDs in job polling
       - Fixed job/opcode persistence on unclean master shutdown
       - Fixed handling of partial job processing after unclean master
         shutdown
       - Fixed error reporting from LUs, previously all errors were converted
         into execution errors
       - Fixed error reporting from burnin
       - Decreased significantly the memory usage of the job queue
       - Optimised slightly multi-job submission
       - Optimised slightly opcode loading
       - Backported the multi-job submit framework from the development
         branch; multi-instance start and stop should be faster
       - Added script to clean archived jobs after 21 days; this will reduce
         the size of the queue directory
       - Added some extra checks in disk size tracking
       - Added an example ethers hook script
       - Added a cluster parameter that prevents Ganeti from modifying of
         /etc/hosts
       - Added more node information to RAPI responses
       - Added a ``gnt-job watch`` command that allows following the ouput of a
         job
       - Added a bind-address option to ganeti-rapi
       - Added more checks to the configuration verify
       - Enhanced the burnin script such that some operations can be retried
         automatically
       - Converted instance reinstall to multi-instance model
       Version 2.0.3
       -------------
       *(Released Fri, 7 Aug 2009)*
       - Added ``--ignore-size`` to the ``gnt-instance activate-disks`` command
         to allow using the pre-2.0.2 behaviour in activation, if any existing
         instances have mismatched disk sizes in the configuration
       - Added ``gnt-cluster repair-disk-sizes`` command to check and update
         any configuration mismatches for disk sizes
       - Added ``gnt-master cluste-failover --no-voting`` to allow master
         failover to work on two-node clusters
       - Fixed the ``--net`` option of ``gnt-backup import``, which was
         unusable
       - Fixed detection of OS script errors in ``gnt-backup export``
       - Fixed exit code of ``gnt-backup export``
       Version 2.0.2
       -------------
       *(Released Fri, 17 Jul 2009)*
       - Added experimental support for stripped logical volumes; this should
         enhance performance but comes with a higher complexity in the block
         device handling; stripping is only enabled when passing
         ``--with-lvm-stripecount=N`` to ``configure``, but codepaths are
         affected even in the non-stripped mode
       - Improved resiliency against transient failures at the end of DRBD
         resyncs, and in general of DRBD resync checks
       - Fixed a couple of issues with exports and snapshot errors
       - Fixed a couple of issues in instance listing
       - Added display of the disk size in ``gnt-instance info``
       - Fixed checking for valid OSes in instance creation
       - Fixed handling of the "vcpus" parameter in instance listing and in
         general of invalid parameters
       - Fixed http server library, and thus RAPI, to handle invalid
         username/password combinations correctly; this means that now they
         report unauthorized for queries too, not only for modifications,
         allowing earlier detect of configuration problems
       - Added a new "role" node list field, equivalent to the master/master
         candidate/drained/offline flags combinations
       - Fixed cluster modify and changes of candidate pool size
       - Fixed cluster verify error messages for wrong files on regular nodes
       - Fixed a couple of issues with node demotion from master candidate role
       - Fixed node readd issues
       - Added non-interactive mode for ``ganeti-masterd --no-voting`` startup
       - Added a new ``--no-voting`` option for masterfailover to fix failover
         on two-nodes clusters when the former master node is unreachable
       - Added instance reinstall over RAPI
       Version 2.0.1
       -------------
       *(Released Tue, 16 Jun 2009)*
       - added ``-H``/``-B`` startup parameters to ``gnt-instance``, which will
         allow re-adding the start in single-user option (regression from 1.2)
       - the watcher writes the instance status to a file, to allow monitoring
         to report the instance status (from the master) based on cached
         results of the watcher's queries; while this can get stale if the
         watcher is being locked due to other work on the cluster, this is
         still an improvement
       - the watcher now also restarts the node daemon and the rapi daemon if
         they died
       - fixed the watcher to handle full and drained queue cases
       - hooks export more instance data in the environment, which helps if
         hook scripts need to take action based on the instance's properties
         (no longer need to query back into ganeti)
       - instance failovers when the instance is stopped do not check for free
         RAM, so that failing over a stopped instance is possible in low memory
         situations
       - rapi uses queries for tags instead of jobs (for less job traffic), and
         for cluster tags it won't talk to masterd at all but read them from
         ssconf
       - a couple of error handling fixes in RAPI
       - drbd handling: improved the error handling of inconsistent disks after
         resync to reduce the frequency of "there are some degraded disks for
         this instance" messages
       - fixed a bug in live migration when DRBD doesn't want to reconnect (the
         error handling path called a wrong function name)
       Version 2.0.0
       -------------
       *(Released Wed, 27 May 2009)*
       - no changes from rc5
       Version 2.0 rc5
       ---------------
       *(Released Wed, 20 May 2009)*
       - fix a couple of bugs (validation, argument checks)
       - fix ``gnt-cluster getmaster`` on non-master nodes (regression)
       - some small improvements to RAPI and IAllocator
       - make watcher automatically start the master daemon if down
       Version 2.0 rc4
       ---------------
       *(Released Mon, 27 Apr 2009)*
       - change the OS list to not require locks; this helps with big clusters
       - fix ``gnt-cluster verify`` and ``gnt-cluster verify-disks`` when the
         volume group is broken
       - ``gnt-instance info``, without any arguments, doesn't run for all
         instances anymore; either pass ``--all`` or pass the desired
         instances; this helps against mistakes on big clusters where listing
         the information for all instances takes a long time
       - miscellaneous doc and man pages fixes
       Version 2.0 rc3
       ---------------
       *(Released Wed, 8 Apr 2009)*
       - Change the internal locking model of some ``gnt-node`` commands, in
         order to reduce contention (and blocking of master daemon) when
         batching many creation/reinstall jobs
       - Fixes to Xen soft reboot
       - No longer build documentation at build time, instead distribute it in
         the archive, in order to reduce the need for the whole docbook/rst
         toolchains
       Version 2.0 rc2
       ---------------
       *(Released Fri, 27 Mar 2009)*
       - Now the cfgupgrade scripts works and can upgrade 1.2.7 clusters to 2.0
       - Fix watcher startup sequence, improves the behaviour of busy clusters
       - Some other fixes in ``gnt-cluster verify``, ``gnt-instance
         replace-disks``, ``gnt-instance add``, ``gnt-cluster queue``, KVM VNC
         bind address and other places
       - Some documentation fixes and updates
       Version 2.0 rc1
       ---------------
       *(Released Mon, 2 Mar 2009)*
       - More documentation updates, now all docs should be more-or-less
         up-to-date
       - A couple of small fixes (mixed hypervisor clusters, offline nodes,
         etc.)
       - Added a customizable HV_KERNEL_ARGS hypervisor parameter (for Xen PVM
         and KVM)
       - Fix an issue related to $libdir/run/ganeti and cluster creation
       Version 2.0 beta2
       -----------------
       *(Released Thu, 19 Feb 2009)*
       - Xen PVM and KVM have switched the default value for the instance root
         disk to the first partition on the first drive, instead of the whole
         drive; this means that the OS installation scripts must be changed
         accordingly
       - Man pages have been updated
       - RAPI has been switched by default to HTTPS, and the exported functions
         should all work correctly
       - RAPI v1 has been removed
       - Many improvements to the KVM hypervisor
       - Block device errors are now better reported
       - Many other bugfixes and small improvements
       Version 2.0 beta1
       -----------------
       *(Released Mon, 26 Jan 2009)*
       - Version 2 is a general rewrite of the code and therefore the
         differences are too many to list, see the design document for 2.0 in
         the ``doc/`` subdirectory for more details
       - In this beta version there is not yet a migration path from 1.2 (there
         will be one in the final 2.0 release)
       - A few significant changes are:
         - all commands are executed by a daemon (``ganeti-masterd``) and the
           various ``gnt-*`` commands are just front-ends to it
         - all the commands are entered into, and executed from a job queue,
           see the ``gnt-job(8)`` manpage
         - the RAPI daemon supports read-write operations, secured by basic
           HTTP authentication on top of HTTPS
         - DRBD version 0.7 support has been removed, DRBD 8 is the only
           supported version (when migrating from Ganeti 1.2 to 2.0, you need
           to migrate to DRBD 8 first while still running Ganeti 1.2)
         - DRBD devices are using statically allocated minor numbers, which
           will be assigned to existing instances during the migration process
         - there is support for both Xen PVM and Xen HVM instances running on
           the same cluster
         - KVM virtualization is supported too
         - file-based storage has been implemented, which means that it is
           possible to run the cluster without LVM and DRBD storage, for
           example using a shared filesystem exported from shared storage (and
           still have live migration)
       Version 1.2.7
       -------------
       *(Released Tue, 13 Jan 2009)*
       - Change the default reboot type in ``gnt-instance reboot`` to "hard"
       - Reuse the old instance mac address by default on instance import, if
         the instance name is the same.
       - Handle situations in which the node info rpc returns incomplete
         results (issue 46)
       - Add checks for tcp/udp ports collisions in ``gnt-cluster verify``
       - Improved version of batcher:
         - state file support
         - instance mac address support
         - support for HVM clusters/instances
       - Add an option to show the number of cpu sockets and nodes in
         ``gnt-node list``
       - Support OSes that handle more than one version of the OS api (but do
         not change the current API in any other way)
       - Fix ``gnt-node migrate``
       - ``gnt-debug`` man page
       - Fixes various more typos and small issues
       - Increase disk resync maximum speed to 60MB/s (from 30MB/s)
       Version 1.2.6
       -------------
       *(Released Wed, 24 Sep 2008)*
       - new ``--hvm-nic-type`` and ``--hvm-disk-type`` flags to control the
         type of disk exported to fully virtualized instances.
       - provide access to the serial console of HVM instances
       - instance auto_balance flag, set by default. If turned off it will
         avoid warnings on cluster verify if there is not enough memory to fail
         over an instance. in the future it will prevent automatically failing
         it over when we will support that.
       - batcher tool for instance creation, see ``tools/README.batcher``
       - ``gnt-instance reinstall --select-os`` to interactively select a new
         operating system when reinstalling an instance.
       - when changing the memory amount on instance modify a check has been
         added that the instance will be able to start. also warnings are
         emitted if the instance will not be able to fail over, if auto_balance
         is true.
       - documentation fixes
       - sync fields between ``gnt-instance list/modify/add/import``
       - fix a race condition in drbd when the sync speed was set after giving
         the device a remote peer.
       Version 1.2.5
       -------------
       *(Released Tue, 22 Jul 2008)*
       - note: the allowed size and number of tags per object were reduced
       - fix a bug in ``gnt-cluster verify`` with inconsistent volume groups
       - fixed twisted 8.x compatibility
       - fixed ``gnt-instance replace-disks`` with iallocator
       - add TCP keepalives on twisted connections to detect restarted nodes
       - disk increase support, see ``gnt-instance grow-disk``
       - implement bulk node/instance query for RAPI
       - add tags in node/instance listing (optional)
       - experimental migration (and live migration) support, read the man page
         for ``gnt-instance migrate``
       - the ``ganeti-watcher`` logs are now timestamped, and the watcher also
         has some small improvements in handling its state file
       Version 1.2.4
       -------------
       *(Released Fri, 13 Jun 2008)*
       - Experimental readonly, REST-based remote API implementation;
         automatically started on master node, TCP port 5080, if enabled by
         ``--enable-rapi`` parameter to configure script.
       - Instance allocator support. Add and import instance accept a
         ``--iallocator`` parameter, and call that instance allocator to decide
         which node to use for the instance. The iallocator document describes
         what's expected from an allocator script.
       - ``gnt-cluster verify`` N+1 memory redundancy checks: Unless passed the
         ``--no-nplus1-mem`` option ``gnt-cluster verify`` now checks that if a
         node is lost there is still enough memory to fail over the instances
         that reside on it.
       - ``gnt-cluster verify`` hooks: it is now possible to add post-hooks to
         ``gnt-cluster verify``, to check for site-specific compliance. All the
         hooks will run, and their output, if any, will be displayed. Any
         failing hook will make the verification return an error value.
       - ``gnt-cluster verify`` now checks that its peers are reachable on the
         primary and secondary interfaces
       - ``gnt-node add`` now supports the ``--readd`` option, to readd a node
         that is still declared as part of the cluster and has failed.
       - ``gnt-* list`` commands now accept a new ``-o +field`` way of
         specifying output fields, that just adds the chosen fields to the
         default ones.
       - ``gnt-backup`` now has a new ``remove`` command to delete an existing
         export from the filesystem.
       - New per-instance parameters hvm_acpi, hvm_pae and hvm_cdrom_image_path
         have been added. Using them you can enable/disable acpi and pae
         support, and specify a path for a cd image to be exported to the
         instance. These parameters as the name suggest only work on HVM
         clusters.
       - When upgrading an HVM cluster to Ganeti 1.2.4, the values for ACPI and
         PAE support will be set to the previously hardcoded values, but the
         (previously hardcoded) path to the CDROM ISO image will be unset and
         if required, needs to be set manually with ``gnt-instance modify``
         after the upgrade.
       - The address to which an instance's VNC console is bound is now
         selectable per-instance, rather than being cluster wide. Of course
         this only applies to instances controlled via VNC, so currently just
         applies to HVM clusters.
       Version 1.2.3
       -------------
       *(Released Mon, 18 Feb 2008)*
       - more tweaks to the disk activation code (especially helpful for DRBD)
       - change the default ``gnt-instance list`` output format, now there is
         one combined status field (see the manpage for the exact values this
         field will have)
       - some more fixes for the mac export to hooks change
       - make Ganeti not break with DRBD 8.2.x (which changed the version
         format in ``/proc/drbd``) (issue 24)
       - add an upgrade tool from "remote_raid1" disk template to "drbd" disk
         template, allowing migration from DRBD0.7+MD to DRBD8
       Version 1.2.2
       -------------
       *(Released Wed, 30 Jan 2008)*
       - fix ``gnt-instance modify`` breakage introduced in 1.2.1 with the HVM
         support (issue 23)
       - add command aliases infrastructure and a few aliases
       - allow listing of VCPUs in the ``gnt-instance list`` and improve the
         man pages and the ``--help`` option of ``gnt-node
         list``/``gnt-instance list``
       - fix ``gnt-backup list`` with down nodes (issue 21)
       - change the tools location (move from $pkgdatadir to $pkglibdir/tools)
       - fix the dist archive and add a check for including svn/git files in
         the future
       - some developer-related changes: improve the burnin and the QA suite,
         add an upload script for testing during development
       Version 1.2.1
       -------------
       *(Released Wed, 16 Jan 2008)*
       - experimental HVM support, read the install document, section
         "Initializing the cluster"
       - allow for the PVM hypervisor per-instance kernel and initrd paths
       - add a new command ``gnt-cluster verify-disks`` which uses a new
         algorithm to improve the reconnection of the DRBD pairs if the device
         on the secondary node has gone away
       - make logical volume code auto-activate LVs at disk activation time
       - slightly improve the speed of activating disks
       - allow specification of the MAC address at instance creation time, and
         changing it later via ``gnt-instance modify``
       - fix handling of external commands that generate lots of output on
         stderr
       - update documentation with regard to minimum version of DRBD8 supported
       Version 1.2.0
       -------------
       *(Released Tue, 4 Dec 2007)*
       - Log the ``xm create`` output to the node daemon log on failure (to
         help diagnosing the error)
       - In debug mode, log all external commands output if failed to the logs
       - Change parsing of lvm commands to ignore stderr
       Version 1.2 beta3
       -----------------
       *(Released Wed, 28 Nov 2007)*
       - Another round of updates to the DRBD 8 code to deal with more failures
         in the replace secondary node operation
       - Some more logging of failures in disk operations (lvm, drbd)
       - A few documentation updates
       - QA updates
       Version 1.2 beta2
       -----------------
       *(Released Tue, 13 Nov 2007)*
       - Change configuration file format from Python's Pickle to JSON.
         Upgrading is possible using the cfgupgrade utility.
       - Add support for DRBD 8.0 (new disk template ``drbd``) which allows for
         faster replace disks and is more stable (DRBD 8 has many improvements
         compared to DRBD 0.7)
       - Added command line tags support (see man pages for ``gnt-instance``,
         ``gnt-node``, ``gnt-cluster``)
       - Added instance rename support
       - Added multi-instance startup/shutdown
       - Added cluster rename support
       - Added ``gnt-node evacuate`` to simplify some node operations
       - Added instance reboot operation that can speedup reboot as compared to
         stop and start
       - Soften the requirement that hostnames are in FQDN format
       - The ``ganeti-watcher`` now activates drbd pairs after secondary node
         reboots
       - Removed dependency on debian's patched fping that uses the
         non-standard ``-S`` option
       - Now the OS definitions are searched for in multiple, configurable
         paths (easier for distros to package)
       - Some changes to the hooks infrastructure (especially the new
         post-configuration update hook)
       - Other small bugfixes
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       .. End:

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