[ClusterLabs] Multiple apache services running

[Ken Gaillot]

On 08/04/2015 07:49 AM, Vijay Partha wrote:
> hi..
> 
> on-fail="restart" is not working.

In what way?

Your logs will generally point you in the right direction. You should be
able to see whether Pacemaker detected a failure, whether it tried to
execute the resource agent, and what value the resource agent returned.

Figuring out which of those steps failed will help you figure out how to
fix it.

> On Wed, Jul 29, 2015 at 7:26 PM, Ken Gaillot <kgaillot at redhat.com> wrote:
> 
>> On 07/29/2015 08:05 AM, Vijay Partha wrote:
>>> Hi.
>>>
>>> Victor, Whatever you said i had tried and got it working. Thank you.
>>>
>>> Could you guys answer the following questions please?
>>>
>>> 1.) I have 2 apache services running on the same node. If the services go
>>> down can pacemaker restart it?
>>
>> Yes, that's what pacemaker is for :)
>>
>> If by two services you mean two server instances of apache, then you
>> would configure two apache resources in pacemaker. If you mean two web
>> apps running in one apache server, you'd configure one apache resource
>> in pacemaker.
>>
>> You would also need a monitor operation, which tells pacemaker to
>> periodically check the health of the service.
>>
>> The migration-threshold and on-fail options determine what the cluster
>> does on failure. See the documentation for possible values, but the
>> default behavior is to try to restart the service on the same node.
>>
>> The documentation for all the options is at
>>
>> http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Pacemaker_Explained/index.html
>>
>>> 2.) I have 2 apache services running on different nodes. Can i control
>> both
>>> the resources from a single node by making use of pacemaker?
>>
>> The various cluster tools work from any node, to affect any or all
>> nodes. Most commonly you'd use one of the high-level cluster shells
>> (crmsh or pcs). They have commands to enable/disable a resource, move a
>> resource to a different node, put a node in standby mode, etc.