[ClusterLabs] Recovering after split-brain

Nikhil Utane nikhil.subscribed at gmail.com
Mon Jun 20 09:30:12 EDT 2016


For our solution we are making a conscious choice to not use quorum/fencing
as for us service availability is more important than having 2 nodes take
up the same active role. Split-brain is not an issue for us (at least i
think that way) since we have a second line of defense. We have clients who
can connect to only one of the two active nodes. So in that sense, even if
we end up with 2 nodes becoming active, since the clients can connect to
only 1 of the active node, we should not have any issue.

Now my question is what happens after recovering from split-brain since the
resource will be active on both the nodes. From application point of view
we want to be able to find out which node is servicing the clients and keep
that operational and make the other one as standby.

Does Pacemaker make it easy to do this kind of thing through some means?
Are there any issues that I am completely unaware due to letting
split-brain occur?

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