[ClusterLabs] Multiple apache services running

[Vijay Partha]

Thanks a lot Ken. for the second case whatever you said , is it possible to
control even for multiple instances of apache? like i have node 1 running 2
instances of apache and another node running 1 instance in apache. If my
apache server goes down will all these instances be restarted?

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.
>
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-- 
With Regards
P.Vijay
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