[ClusterLabs] Pacemaker ordering constraints and resource failures
Devin A. Bougie
devin.bougie at cornell.edu
Mon Aug 6 17:07:03 UTC 2018
What is the best way to make sure pacemaker doesn’t attempt to recover or restart a resource if a resource it depends on is not started?
For example, we have two dummy resources that simply sleep - master_sleep and slave_sleep. We then have a non-symmetrical ordering constraint that ensures master_sleep is started before slave_sleep:
start master_sleep then start slave_sleep (kind:Mandatory) (non-symmetrical)
This works as expected when both resources are disabled. If we enable slave_sleep first, it won’t actually start until after master_sleep if enabled and started.
However, if slave_sleep dies when master_sleep is disabled and stopped, pacemaker recovers and restarts slave_sleep. For example:
- enable master_sleep, and wait for it to start
- enable slave_sleep, and wait for it to start
- disable master_sleep, and wait for it to stop
- kill the slave_sleep process (or, “pcs resource debug-stop slave_sleep”)
- pacemaker recovers and restarts slave_sleep, even though master_sleep is disabled and stopped.
Is this the expected behavior, and is there any way to change it? I’m happy to provide logs if that would help.
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