Re: [ClusterLabs] documentation on STONITH with remote nodes?

[Adam Spiers]

Ken Gaillot  wrote:
> On 03/12/2016 05:07 AM, Adam Spiers wrote:
> > Is there any documentation on how STONITH works on remote nodes?  I
> > couldn't find any on clusterlabs.org, and it's conspicuously missing
> > from:
> > 
> > http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html-single/Pacemaker_Remote/
> > 
> > I'm guessing the answer is more or less "it works exactly the same as
> > for corosync nodes", however I expect there are nuances which might be
> > worth documenting.  In particular I'm looking for confirmation that
> > STONITH resources for remote nodes will only run on the corosync
> > nodes, and can't run on (other) remote nodes.  My empirical tests seem
> > to confirm this, but reassurance from an expert would be appreciated :-)
> 
> The above link does have some information -- search it for "fencing".

Ah!  Thanks - I had only searched for "STONITH".  Here it is:

http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html-single/Pacemaker_Remote/#_fencing_remote_nodes

> You are correct, only full cluster nodes can run fence devices or
> initiate fencing actions.
> 
> Fencing of remote nodes (configured via ocf:pacemaker:remote resource)
> is indeed identical to fencing of full cluster nodes. You can configure
> fence devices for them the same way, and the cluster fences them the
> same way.

Thanks for the confirmation.

> Fencing of guest nodes (configured via remote-node property of a
> resource such as VirtualDomain) is different. For those, fence devices
> are ignored, and the cluster fences them by stopping and starting the
> resource.

Makes sense and is intuitive.  And I also found that it is documented
here:

http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html-single/Pacemaker_Remote/#_testing_recovery_and_fencing

Thanks again!

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Re: [ClusterLabs] documentation on STONITH with remote nodes?

[Ken Gaillot]

On 03/12/2016 05:07 AM, Adam Spiers wrote:
> Is there any documentation on how STONITH works on remote nodes?  I
> couldn't find any on clusterlabs.org, and it's conspicuously missing
> from:
> 
> http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html-single/Pacemaker_Remote/
> 
> I'm guessing the answer is more or less "it works exactly the same as
> for corosync nodes", however I expect there are nuances which might be
> worth documenting.  In particular I'm looking for confirmation that
> STONITH resources for remote nodes will only run on the corosync
> nodes, and can't run on (other) remote nodes.  My empirical tests seem
> to confirm this, but reassurance from an expert would be appreciated :-)

The above link does have some information -- search it for "fencing".

You are correct, only full cluster nodes can run fence devices or
initiate fencing actions.

Fencing of remote nodes (configured via ocf:pacemaker:remote resource)
is indeed identical to fencing of full cluster nodes. You can configure
fence devices for them the same way, and the cluster fences them the
same way.

Fencing of guest nodes (configured via remote-node property of a
resource such as VirtualDomain) is different. For those, fence devices
are ignored, and the cluster fences them by stopping and starting the
resource.

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Users mailing list: Users@clusterlabs.org
http://clusterlabs.org/mailman/listinfo/users

Project Home: http://www.clusterlabs.org
Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
Bugs: http://bugs.clusterlabs.org