Am 04.09.2012 um 17:56 schrieb Stefan Schloesser:
> I would like to know what the recommended way is to update a
> cluster. Every week or so bug fixes and security patches are
> released for a various parts of the used software.
> Take for instance mysql: an update might change the binary and/or
> some data in the internal database.
Depends on your configuration.
In our configuration each Xen-VM has its complete filesystem on an own
DRBD-device. Thus the upgrades are as easy as on a single real
machine. Usually I just do a
apt-get upgrade
without any problems. Of course I first do the upgrades on the similar
configured, less critical machines in this order:
development.internal, test.internal, staging.internal, xen-
host.internal. If everything is ok, I upgrade the production-machines.
These live upgrades can cause short interruptions of services.
Upgrading the Xen-hosts is more critical, especially if the upgrades
are for kernel, kernel modules or Xen. In most cases just 'apt-get
upgrade' will work without problems. But a restart of a crm-monitored
service like e.g. Xend can cause unwanted failovers, if the cluster
isn't in unmanaged/maintenance mode.
Helmut Wollmersdorfer
_______________________________________________
Linux-HA mailing list
[email protected]
http://lists.linux-ha.org/mailman/listinfo/linux-ha
See also: http://linux-ha.org/ReportingProblems
