[Linux-cluster] Online change of fence device options - possible?
lists at alteeve.ca
Mon Jun 23 18:16:37 UTC 2014
On 23/06/14 02:09 PM, Vasil Valchev wrote:
> I have a RHEL 6.5 cluster, using rgmanager.
> The fence devices are fence_ipmilan - fencing through HP iLO4.
> The issue is the fence devices weren't configured entirely correct -
> recently after a node failure, the fence agent was returning failures
> (even though it was fencing the node successfully), which apparently can
> be avoided by setting the power_wait option to the fence dev configuration.
> My question is - after changing the fence device (I think directly
> through the .conf will be fine?), iterating the config version, and
> syncing the .conf through the cluster software - is something else
> necessary to apply the change (eg. cman reload)?
> Will the new fence option be used the next time a fencing action is
> And lastly can all of this be performed while the cluster and services
> are operational or they have to be stopped/restarted?
This should be fine. As you said; Update the fence config, increment the
config_version, save and exit. Run 'ccs_config_validate' and if that
passes, 'cman_tool version -r'. Note that for this to work, you need to
have set the 'ricci' user's shell password as well as have the 'ricci'
and 'modclusterd' daemons running.
Once done, run 'fence_check' to verify that the fence config works
(it makes a status call to check). If that works, you're good to go.
You can also crontab the fence_check call and have it email you or
something so that you can catch fence failures earlier.
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