Commit 56c9a709 authored by Iustin Pop's avatar Iustin Pop

Add documentation on manual cluster cleanup

Signed-off-by: default avatarIustin Pop <iustin@google.com>
Reviewed-by: default avatarMichael Hanselmann <hansmi@google.com>
parent ca9ccea8
......@@ -293,3 +293,61 @@ or execute cluster-wide operations. For example::
gnt-cluster version
See the man page :manpage:`gnt-cluster` to know more about their usage.
Removing a cluster entirely
~~~~~~~~~~~~~~~~~~~~~~~~~~~
The usual method to cleanup a cluster is to run ``gnt-cluster
destroy`` however if the Ganeti installation is broken in any way then
this will not run.
It is possible in such a case to cleanup manually most if not all
traces of a cluster installation by following these steps on all of
the nodes:
1. Shutdown all instances. This depends on the virtualisation
method used (Xen, KVM, etc.):
- Xen: run ``xm list`` and ``xm destroy`` on all the non-Domain-0
instances
- KVM: kill all the KVM processes
- chroot: kill all processes under the chroot mountpoints
2. If using DRBD, shutdown all DRBD minors (which should by at this
time no-longer in use by instances); on each node, run ``drbdsetup
/dev/drbdN down`` for each active DRBD minor.
3. If using LVM, cleanup the Ganeti volume group; if only Ganeti
created logical volumes (and you are not sharing the volume group
with the OS, for example), then simply running ``lvremove -f
xenvg`` (replace 'xenvg' with your volume group name) should do the
required cleanup.
4. If using file-based storage, remove recursively all files and
directories under your file-storage directory: ``rm -rf
/srv/ganeti/file-storage/*`` replacing the path with the correct
path for your cluster.
5. Stop the ganeti daemons (``/etc/init.d/ganeti stop``) and kill any
that remain alive (``pgrep ganeti`` and ``pkill ganeti``).
6. Remove the ganeti state directory (``rm -rf /var/lib/ganeti/*``),
replacing the path with the correct path for your installation.
On the master node, remove the cluster from the master-netdev (usually
``xen-br0`` for bridged mode, otherwise ``eth0`` or similar), by
running ``ip a del $clusterip/32 dev xen-br0`` (use the correct
cluster ip and network device name).
At this point, the machines are ready for a cluster creation; in case
you want to remove Ganeti completely, you need to also undo some of
the SSH changes and log directories:
- ``rm -rf /var/log/ganeti /srv/ganeti`` (replace with the correct paths)
- remove from ``/root/.ssh`` the keys that Ganeti added (check
the ``authorized_keys`` and ``id_dsa`` files)
- regenerate the host's SSH keys (check the OpenSSH startup scripts)
- uninstall Ganeti
Otherwise, if you plan to re-create the cluster, you can just go ahead
and rerun ``gnt-cluster init``.
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