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Re: [Linux-cluster] Service location (colocation)



Is pacemaker a supported alternative for rgmanager? Starting with which
version of Red Hat Enterprise Linux?

Thank you,
Laszlo


On 03/04/2011 07:06 PM, Lon Hohberger wrote:
> On Sun, Feb 27, 2011 at 06:08:41PM +0200, Budai Laszlo wrote:
>> Hi all,
>>
>> is there a way to define location dependencies among services? for
>> instance how can I define that Service A should run on the same node as
>> service B? Or the opposite: Service C should run on a different node
>> than service D?
>>
> rgmanager doesn't have this feature built-in; you can define
> 'collocated services' by simply creating one large service comprising
> all of the resources for both services.
>
> You could probably trivially extend central_processing mode to do "anti
> collocation" (i.e. run on another node).
>
> The 'follow_service.sl' script is an example of how to do part of
> 'anti-collocation'.   The way it works, it starts service A on a
> different node from service B.  If the node running service A fails, it
> is started on the same node as service B, then service B is moved away
> to another (empty, usually) node in the cluster.
>
> Alternatively, pacemaker supports this functionality.
>


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