[Pacemaker] no-quorum-policy = demote?

[Alexandre]

Le 10 avr. 2014 15:44, "Christian Ciach" <dereineda at gmail.com> a écrit :
>
> I don't really like the idea to periodically poll "crm_node -q" for the
current quorum state. No matter how frequently the monitor-function gets
called, there will always be a small time frame where both nodes will be in
the master state at the same time.
>
> Is there a way to get a notification to the OCF-agent whenever the quorum
state changes?

You should probably look for something like this in the ocfshellfunction.sh
file.

But also take a look at the page below, it has a lot of multi state
dedicated variables that are most definitely useful in your case.

http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/_multi_state_proper_interpretation_of_notification_environment_variables.html

>
>
> 2014-04-08 10:14 GMT+02:00 Christian Ciach <dereineda at gmail.com>:
>
>> Interesting idea! I can confirm that this works. So, I need to monitor
the output of "crm_node -q" to check if the current partition has quorum.
If the partition doesn't have quorum, I need to set the location constraint
according to your example. If the partition gets quorum again, I need to
remove the constraint.
>>
>> This seems almost a bit hacky, but it should work okay. Thank you! It
almost a shame that pacemaker doesn't have "demote" as a
"no-quorum-policy", but supports "demote" as a "loss-policy" for tickets.
>>
>> Yesterday I had another idea: Maybe I won't use a multistate resource
agent but a primitive instead. This way, I will start the resource outside
of pacemaker and let the start-action of the OCF-agent set the resource to
master and the stop-action sets it to slave. Then I will just use
"no-quorum-policy=stop". The downside of this is that I cannot distinguish
between a stopped resource and a resource in a slave state using crm_mon.
>
>
>
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