[ClusterLabs] What triggers fencing?

Klaus Wenninger kwenning at redhat.com
Mon Jul 9 08:31:42 EDT 2018

On 07/09/2018 02:04 PM, Confidential Company wrote:
> Hi,
> Any ideas what triggers fencing script or stonith?
> Given the setup below:
> 1. I have two nodes
> 2. Configured fencing on both nodes
> 3. Configured delay=15 and delay=30 on fence1(for Node1) and
> fence2(for Node2) respectively
> *What does it mean to configured delay in stonith? wait for 15 seconds
> before it fence the node?

Given that on a 2-node-cluster you don't have real quorum to make one
partial cluster fence the rest of the nodes the different delays are meant
to prevent a fencing-race.
Without different delays that would lead to both nodes fencing each
other at the same time - finally both being down.

> *Given Node1 is active and Node2 goes down, does it mean fence1 will
> first execute and shutdowns Node1 even though Node2 goes down?

If Node2 managed to sign off properly it will not.
If network-connection is down so that Node2 can't inform Node1 that it
is going
down and finally has stopped all resources it will be fenced by Node1.

> Thanks
> imnotarobot
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