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Upgrade notes
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=============
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.. highlight:: shell-example
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This document details the steps needed to upgrade a cluster to newer versions
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of Ganeti.
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As a general rule the node daemons need to be restarted after each software
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upgrade; if using the provided example init.d script, this means running the
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following command on all nodes::
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    $ /etc/init.d/ganeti restart
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2.1 and above
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-------------
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Starting with Ganeti 2.0, upgrades between revisions (e.g. 2.1.0 to 2.1.1)
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should not need manual intervention. As a safety measure, minor releases (e.g.
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2.1.3 to 2.2.0) require the ``cfgupgrade`` command for changing the
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configuration version. Below you find the steps necessary to upgrade between
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minor releases.
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To run commands on all nodes, the `distributed shell (dsh)
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<http://www.netfort.gr.jp/~dancer/software/dsh.html.en>`_ can be used, e.g.
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``dsh -M -F 8 -f /var/lib/ganeti/ssconf_online_nodes gnt-cluster --version``.
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#. Ensure no jobs are running (master node only)::
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    $ gnt-job list
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#. Pause the watcher for an hour (master node only)::
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    $ gnt-cluster watcher pause 1h
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#. Stop all daemons on all nodes::
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    $ /etc/init.d/ganeti stop
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#. Backup old configuration (master node only)::
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    $ tar czf /var/lib/ganeti-$(date +\%FT\%T).tar.gz -C /var/lib ganeti
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#. Install new Ganeti version on all nodes
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#. Run cfgupgrade on the master node::
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    $ /usr/lib/ganeti/tools/cfgupgrade --verbose --dry-run
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    $ /usr/lib/ganeti/tools/cfgupgrade --verbose
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   (``cfgupgrade`` supports a number of parameters, run it with
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   ``--help`` for more information)
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#. Upgrade the directory permissions on all nodes::
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    $ /usr/lib/ganeti/ensure-dirs --full-run
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#. Restart daemons on all nodes::
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    $ /etc/init.d/ganeti restart
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#. Re-distribute configuration (master node only)::
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    $ gnt-cluster redist-conf
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#. If you use file storage, check that the ``/etc/ganeti/file-storage-paths``
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#. is correct on all nodes. For security reasons it's not copied
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#. automatically, but it can be copied manually via::
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   $ gnt-cluster copyfile /etc/ganeti/file-storage-paths
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#. Restart daemons again on all nodes::
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    $ /etc/init.d/ganeti restart
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#. Enable the watcher again (master node only)::
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    $ gnt-cluster watcher continue
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#. Verify cluster (master node only)::
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    $ gnt-cluster verify
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Reverting an upgrade
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~~~~~~~~~~~~~~~~~~~~
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For going back between revisions (e.g. 2.1.1 to 2.1.0) no manual
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intervention is required, as for upgrades.
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Starting from version 2.8, ``cfgupgrade`` supports ``--downgrade``
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option to bring the configuration back to the previous stable version.
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This is useful if you upgrade Ganeti and after some time you run into
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problems with the new version. You can downgrade the configuration
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without losing the changes made since the upgrade. Any feature not
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supported by the old version will be removed from the configuration, of
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course, but you get a warning about it. If there is any new feature and
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you haven't changed from its default value, you don't have to worry
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about it, as it will get the same value whenever you'll upgrade again.
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The procedure is similar to upgrading, but please notice that you have to
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revert the configuration **before** installing the old version.
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#. Ensure no jobs are running (master node only)::
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    $ gnt-job list
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#. Pause the watcher for an hour (master node only)::
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    $ gnt-cluster watcher pause 1h
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#. Stop all daemons on all nodes::
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    $ /etc/init.d/ganeti stop
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#. Backup old configuration (master node only)::
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    $ tar czf /var/lib/ganeti-$(date +\%FT\%T).tar.gz -C /var/lib ganeti
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#. Run cfgupgrade on the master node::
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    $ /usr/lib/ganeti/tools/cfgupgrade --verbose --downgrade --dry-run
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    $ /usr/lib/ganeti/tools/cfgupgrade --verbose --downgrade
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   You may want to copy all the messages about features that have been
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   removed during the downgrade, in case you want to restore them when
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   upgrading again.
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#. Install the old Ganeti version on all nodes
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#. Restart daemons on all nodes::
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    $ /etc/init.d/ganeti restart
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#. Re-distribute configuration (master node only)::
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    $ gnt-cluster redist-conf
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#. Restart daemons again on all nodes::
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    $ /etc/init.d/ganeti restart
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#. Enable the watcher again (master node only)::
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    $ gnt-cluster watcher continue
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#. Verify cluster (master node only)::
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    $ gnt-cluster verify
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2.0 releases
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------------
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2.0.3 to 2.0.4
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~~~~~~~~~~~~~~
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No changes needed except restarting the daemon; but rollback to 2.0.3 might
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require configuration editing.
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If you're using Xen-HVM instances, please double-check the network
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configuration (``nic_type`` parameter) as the defaults might have changed:
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2.0.4 adds any missing configuration items and depending on the version of the
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software the cluster has been installed with, some new keys might have been
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added.
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2.0.1 to 2.0.2/2.0.3
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~~~~~~~~~~~~~~~~~~~~
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Between 2.0.1 and 2.0.2 there have been some changes in the handling of block
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devices, which can cause some issues. 2.0.3 was then released which adds two
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new options/commands to fix this issue.
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If you use DRBD-type instances and see problems in instance start or
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activate-disks with messages from DRBD about "lower device too small" or
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similar, it is recoomended to:
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#. Run ``gnt-instance activate-disks --ignore-size $instance`` for each
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   of the affected instances
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#. Then run ``gnt-cluster repair-disk-sizes`` which will check that
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   instances have the correct disk sizes
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1.2 to 2.0
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----------
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Prerequisites:
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- Ganeti 1.2.7 is currently installed
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- All instances have been migrated from DRBD 0.7 to DRBD 8.x (i.e. no
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  ``remote_raid1`` disk template)
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- Upgrade to Ganeti 2.0.0~rc2 or later (~rc1 and earlier don't have the needed
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  upgrade tool)
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In the below steps, replace :file:`/var/lib` with ``$libdir`` if Ganeti was not
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installed with this prefix (e.g. :file:`/usr/local/var`). Same for
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:file:`/usr/lib`.
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Execution (all steps are required in the order given):
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#. Make a backup of the current configuration, for safety::
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    $ cp -a /var/lib/ganeti /var/lib/ganeti-1.2.backup
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#. Stop all instances::
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    $ gnt-instance stop --all
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#. Make sure no DRBD device are in use, the following command should show no
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   active minors::
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    $ gnt-cluster command grep cs: /proc/drbd | grep -v cs:Unconf
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#. Stop the node daemons and rapi daemon on all nodes (note: should be logged
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   in not via the cluster name, but the master node name, as the command below
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   will remove the cluster ip from the master node)::
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    $ gnt-cluster command /etc/init.d/ganeti stop
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#. Install the new software on all nodes, either from packaging (if available)
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   or from sources; the master daemon will not start but give error messages
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   about wrong configuration file, which is normal
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#. Upgrade the configuration file::
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    $ /usr/lib/ganeti/tools/cfgupgrade12 -v --dry-run
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    $ /usr/lib/ganeti/tools/cfgupgrade12 -v
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#. Make sure ``ganeti-noded`` is running on all nodes (and start it if
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   not)
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#. Start the master daemon::
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    $ ganeti-masterd
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#. Check that a simple node-list works::
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    $ gnt-node list
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#. Redistribute updated configuration to all nodes::
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    $ gnt-cluster redist-conf
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    $ gnt-cluster copyfile /var/lib/ganeti/known_hosts
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#. Optional: if needed, install RAPI-specific certificates under
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   :file:`/var/lib/ganeti/rapi.pem` and run::
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    $ gnt-cluster copyfile /var/lib/ganeti/rapi.pem
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#. Run a cluster verify, this should show no problems::
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    $ gnt-cluster verify
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#. Remove some obsolete files::
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    $ gnt-cluster command rm /var/lib/ganeti/ssconf_node_pass
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    $ gnt-cluster command rm /var/lib/ganeti/ssconf_hypervisor
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#. Update the xen pvm (if this was a pvm cluster) setting for 1.2
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   compatibility::
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    $ gnt-cluster modify -H xen-pvm:root_path=/dev/sda
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#. Depending on your setup, you might also want to reset the initrd parameter::
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    $ gnt-cluster modify -H xen-pvm:initrd_path=/boot/initrd-2.6-xenU
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#. Reset the instance autobalance setting to default::
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    $ for i in $(gnt-instance list -o name --no-headers); do \
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       gnt-instance modify -B auto_balance=default $i; \
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      done
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#. Optional: start the RAPI demon::
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    $ ganeti-rapi
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#. Restart instances::
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    $ gnt-instance start --force-multiple --all
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At this point, ``gnt-cluster verify`` should show no errors and the migration
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is complete.
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1.2 releases
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------------
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1.2.4 to any other higher 1.2 version
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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No changes needed. Rollback will usually require manual edit of the
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configuration file.
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1.2.3 to 1.2.4
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~~~~~~~~~~~~~~
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No changes needed. Note that going back from 1.2.4 to 1.2.3 will require manual
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edit of the configuration file (since we added some HVM-related new
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attributes).
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1.2.2 to 1.2.3
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~~~~~~~~~~~~~~
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No changes needed. Note that the drbd7-to-8 upgrade tool does a disk format
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change for the DRBD metadata, so in theory this might be **risky**. It is
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advised to have (good) backups before doing the upgrade.
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1.2.1 to 1.2.2
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~~~~~~~~~~~~~~
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No changes needed.
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1.2.0 to 1.2.1
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~~~~~~~~~~~~~~
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No changes needed. Only some bugfixes and new additions that don't affect
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existing clusters.
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1.2.0 beta 3 to 1.2.0
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~~~~~~~~~~~~~~~~~~~~~
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No changes needed.
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1.2.0 beta 2 to beta 3
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~~~~~~~~~~~~~~~~~~~~~~
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No changes needed. A new version of the debian-etch-instance OS (0.3) has been
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released, but upgrading it is not required.
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1.2.0 beta 1 to beta 2
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~~~~~~~~~~~~~~~~~~~~~~
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Beta 2 switched the config file format to JSON. Steps to upgrade:
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#. Stop the daemons (``/etc/init.d/ganeti stop``) on all nodes
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#. Disable the cron job (default is :file:`/etc/cron.d/ganeti`)
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#. Install the new version
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#. Make a backup copy of the config file
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#. Upgrade the config file using the following command::
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    $ /usr/share/ganeti/cfgupgrade --verbose /var/lib/ganeti/config.data
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#. Start the daemons and run ``gnt-cluster info``, ``gnt-node list`` and
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   ``gnt-instance list`` to check if the upgrade process finished successfully
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The OS definition also need to be upgraded. There is a new version of the
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debian-etch-instance OS (0.2) that goes along with beta 2.
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.. vim: set textwidth=72 :
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.. Local Variables:
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.. mode: rst
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.. fill-column: 72
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.. End: