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



On Tue, Mar 15, 2011 at 11:02 AM, Budai Laszlo <laszlo budai gmail com> wrote:
> Is pacemaker a supported alternative for rgmanager?

Not yet, although it is available as of 6.0

> 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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