[ClusterLabs] Howto restart resource

[Klaus Wenninger]

On 08/29/2016 04:03 PM, Ken Gaillot wrote:
> On 08/29/2016 01:38 AM, Stefano Ruberti wrote:
>> Dear all,
>>
>> I have following situation and I need an advice from you:
>>
>> in my Active/Passive Cluster  (Ubuntu_16.04  corosync + pacemaker , no pcs)
>>
>> Node_A        Node_B
>> Resource1    Resource1
>> Resource2    Resource2
>> Resource3    Resource3
>> rsyslogd	     rsyslogd	
>>
>> 1. is possible to configure rsyslogd to restarting when node (Node_A or Node_B) go on-line and take resource? 
>>
>>
>> Best Regards
>> Stefano
> Is rsyslogd a cluster resource? That might not be ideal, since pacemaker
> itself needs to use syslog (unless you've configured it not to), and you
> probably want syslog running even if the cluster services are stopped
> (for an upgrade, for example).
>
> If your goal is simply to reload rsyslogd when a resource state changes,
> I would think one of these approaches would be suitable:
>
> Use the new alerts interface (pacemaker 1.1.15+) with an alert script
> that reloads rsyslogd at the desired events;

Be aware that you are not root right away inside these alert-scripts!
 
>
> Or, write a custom resource agent that reloads rsyslogd, and set up
> colocation/ordering constraints between it and the desired resources.
> Pacemaker will then "start" it after starting the resources, and "stop"
> it before stopping the resources. Note that the agent must know whether
> it is "running", and there is a ha_pseudo_resource() function in the OCF
> libraries to handle that.
>
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