Synnefo » snf-ganeti

Upgrade notes

=============

.. highlight:: shell-example

This document details the steps needed to upgrade a cluster to newer versions

of Ganeti.

As a general rule the node daemons need to be restarted after each software

upgrade; if using the provided example init.d script, this means running the

following command on all nodes::

    $ /etc/init.d/ganeti restart

2.1 and above

-------------

Starting with Ganeti 2.0, upgrades between revisions (e.g. 2.1.0 to 2.1.1)

should not need manual intervention. As a safety measure, minor releases (e.g.

2.1.3 to 2.2.0) require the ``cfgupgrade`` command for changing the

configuration version. Below you find the steps necessary to upgrade between

minor releases.

To run commands on all nodes, the `distributed shell (dsh)

<http://www.netfort.gr.jp/~dancer/software/dsh.html.en>`_ can be used, e.g.

``dsh -M -F 8 -f /var/lib/ganeti/ssconf_online_nodes gnt-cluster --version``.

#. Ensure no jobs are running (master node only)::

    $ gnt-job list

#. Stop all daemons on all nodes::

    $ /etc/init.d/ganeti stop

#. Backup old configuration (master node only)::

    $ tar czf /var/lib/ganeti-$(date +\%FT\%T).tar.gz -C /var/lib ganeti

#. Install new Ganeti version on all nodes

#. Run cfgupgrade on the master node::

    $ /usr/lib/ganeti/tools/cfgupgrade --verbose --dry-run

    $ /usr/lib/ganeti/tools/cfgupgrade --verbose

   (``cfgupgrade`` supports a number of parameters, run it with

   ``--help`` for more information)

#. Upgrade the directory permissions on all nodes::

    $ /usr/lib/ganeti/ensure-dirs --full-run

#. Restart daemons on all nodes::

    $ /etc/init.d/ganeti restart

#. Re-distribute configuration (master node only)::

    $ gnt-cluster redist-conf

#. Restart daemons again on all nodes::

    $ /etc/init.d/ganeti restart

#. Verify cluster (master node only)::

    $ gnt-cluster verify

2.0 releases

------------

2.0.3 to 2.0.4

~~~~~~~~~~~~~~

No changes needed except restarting the daemon; but rollback to 2.0.3 might

require configuration editing.

If you're using Xen-HVM instances, please double-check the network

configuration (``nic_type`` parameter) as the defaults might have changed:

2.0.4 adds any missing configuration items and depending on the version of the

software the cluster has been installed with, some new keys might have been

added.

2.0.1 to 2.0.2/2.0.3

~~~~~~~~~~~~~~~~~~~~

Between 2.0.1 and 2.0.2 there have been some changes in the handling of block

devices, which can cause some issues. 2.0.3 was then released which adds two

new options/commands to fix this issue.

If you use DRBD-type instances and see problems in instance start or

activate-disks with messages from DRBD about "lower device too small" or

similar, it is recoomended to:

#. Run ``gnt-instance activate-disks --ignore-size $instance`` for each

   of the affected instances

#. Then run ``gnt-cluster repair-disk-sizes`` which will check that

   instances have the correct disk sizes

1.2 to 2.0

----------

Prerequisites:

- Ganeti 1.2.7 is currently installed

- All instances have been migrated from DRBD 0.7 to DRBD 8.x (i.e. no

  ``remote_raid1`` disk template)

- Upgrade to Ganeti 2.0.0~rc2 or later (~rc1 and earlier don't have the needed

  upgrade tool)

In the below steps, replace :file:`/var/lib` with ``$libdir`` if Ganeti was not

installed with this prefix (e.g. :file:`/usr/local/var`). Same for

:file:`/usr/lib`.

Execution (all steps are required in the order given):

#. Make a backup of the current configuration, for safety::

    $ cp -a /var/lib/ganeti /var/lib/ganeti-1.2.backup

#. Stop all instances::

    $ gnt-instance stop --all

#. Make sure no DRBD device are in use, the following command should show no

   active minors::

    $ gnt-cluster command grep cs: /proc/drbd | grep -v cs:Unconf

#. Stop the node daemons and rapi daemon on all nodes (note: should be logged

   in not via the cluster name, but the master node name, as the command below

   will remove the cluster ip from the master node)::

    $ gnt-cluster command /etc/init.d/ganeti stop

#. Install the new software on all nodes, either from packaging (if available)

   or from sources; the master daemon will not start but give error messages

   about wrong configuration file, which is normal

#. Upgrade the configuration file::

    $ /usr/lib/ganeti/tools/cfgupgrade12 -v --dry-run

    $ /usr/lib/ganeti/tools/cfgupgrade12 -v

#. Make sure ``ganeti-noded`` is running on all nodes (and start it if

   not)

#. Start the master daemon::

    $ ganeti-masterd

#. Check that a simple node-list works::

    $ gnt-node list

#. Redistribute updated configuration to all nodes::

    $ gnt-cluster redist-conf

    $ gnt-cluster copyfile /var/lib/ganeti/known_hosts

#. Optional: if needed, install RAPI-specific certificates under

   :file:`/var/lib/ganeti/rapi.pem` and run::

    $ gnt-cluster copyfile /var/lib/ganeti/rapi.pem

#. Run a cluster verify, this should show no problems::

    $ gnt-cluster verify

#. Remove some obsolete files::

    $ gnt-cluster command rm /var/lib/ganeti/ssconf_node_pass

    $ gnt-cluster command rm /var/lib/ganeti/ssconf_hypervisor

#. Update the xen pvm (if this was a pvm cluster) setting for 1.2

   compatibility::

    $ gnt-cluster modify -H xen-pvm:root_path=/dev/sda

#. Depending on your setup, you might also want to reset the initrd parameter::

    $ gnt-cluster modify -H xen-pvm:initrd_path=/boot/initrd-2.6-xenU

#. Reset the instance autobalance setting to default::

    $ for i in $(gnt-instance list -o name --no-headers); do \

       gnt-instance modify -B auto_balance=default $i; \

      done

#. Optional: start the RAPI demon::

    $ ganeti-rapi

#. Restart instances::

    $ gnt-instance start --force-multiple --all

At this point, ``gnt-cluster verify`` should show no errors and the migration

is complete.

1.2 releases

------------

1.2.4 to any other higher 1.2 version

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

No changes needed. Rollback will usually require manual edit of the

configuration file.

1.2.3 to 1.2.4

~~~~~~~~~~~~~~

No changes needed. Note that going back from 1.2.4 to 1.2.3 will require manual

edit of the configuration file (since we added some HVM-related new

attributes).

1.2.2 to 1.2.3

~~~~~~~~~~~~~~

No changes needed. Note that the drbd7-to-8 upgrade tool does a disk format

change for the DRBD metadata, so in theory this might be **risky**. It is

advised to have (good) backups before doing the upgrade.

1.2.1 to 1.2.2

~~~~~~~~~~~~~~

No changes needed.

1.2.0 to 1.2.1

~~~~~~~~~~~~~~

No changes needed. Only some bugfixes and new additions that don't affect

existing clusters.

1.2.0 beta 3 to 1.2.0

~~~~~~~~~~~~~~~~~~~~~

No changes needed.

1.2.0 beta 2 to beta 3

~~~~~~~~~~~~~~~~~~~~~~

No changes needed. A new version of the debian-etch-instance OS (0.3) has been

released, but upgrading it is not required.

1.2.0 beta 1 to beta 2

~~~~~~~~~~~~~~~~~~~~~~

Beta 2 switched the config file format to JSON. Steps to upgrade:

#. Stop the daemons (``/etc/init.d/ganeti stop``) on all nodes

#. Disable the cron job (default is :file:`/etc/cron.d/ganeti`)

#. Install the new version

#. Make a backup copy of the config file

#. Upgrade the config file using the following command::

    $ /usr/share/ganeti/cfgupgrade --verbose /var/lib/ganeti/config.data

#. Start the daemons and run ``gnt-cluster info``, ``gnt-node list`` and

   ``gnt-instance list`` to check if the upgrade process finished successfully

The OS definition also need to be upgraded. There is a new version of the

debian-etch-instance OS (0.2) that goes along with beta 2.

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