[Pacemaker] status and monitor - why the duplicity?

[Stallmann, Andreas]

Hi!

I figure that many ocf agents use either “status” or “monitor” and sometimes both.

What does Pacemaker / crm expect?

Some examples:


-          tomcat agent always returns OCF_SUCCESS on status: why ask, when you always get the same answer

-          tomcat agent returns OCF_NOT_RUNNING, OCF_ERR_* or OCF_SUCCESS on monitor

-          drbd does not use status at all but uses monitor (which returns NOT_RUNNING, SUCCESS, MASTER, ERR_*

-          mysql (master/slave) uses both, where status checks only if mysql has a running process and monitor checks the master/slave state etc.

I’m a little confused. What would be your advice, if you wrote your own resource agent?

Cheers,

Andreas


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