[Pacemaker] How to stop a resource?

[Tim Ward]

The description of resource agents at

http://www.linux-ha.org/wiki/Resource_Agents

includes "They are synchronous in nature. That is, you start them, and they complete some time later, and you are expected to wait for them to complete."

I am assured by team members that we have verified that our RAs are actually synchronous, ie that when the RA returns from a stop command, in particular, the resource is actually stopped, and an immediately subsequent monitor will say so.

However when the application tries to close down a bunch of things by running the following through the crm command (which is how I was advised by this list to drive Pacemaker programmatically) I get errors suggesting that things haven't stopped immediately. This suggests that Pacemaker is not actually obeying the "you are expected to wait" quoted above.

Here is the crm command input:

configure
   delete colocation_b_with_a
   commit
   up
resource
   stop b
   up
configure
   delete b
   commit
   up
configure
   delete colocation_x_with_a
   commit
   up
resource
   stop a
   up
configure
   delete a
   commit
   up

(colocation_b_with_a says that b must always live on the same box as a colocation_x_with_a says that x and a must never be on the same box)

The return code from the crm command is CibOk. The standard output is empty. The error output contains:

WARNING: 9: resource b is running, can't delete it
INFO: 10: apparently there is nothing to commit
INFO: 10: try changing something first
WARNING: 20: resource a is running, can't delete it
INFO: 21: apparently there is nothing to commit
INFO: 21: try changing something first

On looking at what happened a minute or so later using crm_mon or crm status the two resources that I was trying to stop have in fact stopped by then.

So, does anyone have any ideas as to what is going on here, and/or how to actually stop and then delete something? - thanks!

Tim Ward
Brett Ward Limited - www.brettward.co.uk 




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