[Linux-cluster] heartbeat to rgmanager design question

[Andrew Beekhof]

On Fri, Nov 28, 2008 at 18:34, Brian Kroth <bpkroth at gmail.com> wrote:
> Andrew Beekhof <beekhof at gmail.com> 2008-11-28 08:50:
>> On Thu, Nov 27, 2008 at 15:57, Brian Kroth <bpkroth at gmail.com> wrote:
>> > Hello all,
>> >
>> > I've been using Heartbeat in past to do resource failover with the
>> > following scheme:
>> >
>> > 1) Each node in the cluster runs a dummy monitoring resource agent as a
>> > clone.  This resource agent monitors the health of a service on the node
>> > using whatever rules one wants to write into it.  For instance, make
>> > sure the service is not in maintenance mode, mysql is running, queries
>> > return timely, and replication is up to date.  If all the checks pass it
>> > uses attrd_updater to set an attribute for that service on the node to
>> > 1.  Else, it is set to 0.  Note that this resource agent in no way
>> > affects the service it is monitoring.
>> >
>> > 2) The cluster configuration uses the attributes for each of the
>> > monitored services to generate a score for the machine.  The machine
>> > with the highest score gets to host the virtual ip for that service.
>> >
>> > This scheme allows one to, for instance, touch a file on a machine that
>> > will signify that it's in maintenance mode.  The service ip would then
>> > be moved to another node, leaving one to test out the service on the
>> > machine's management ip without removing it from the cluster itself
>> > which would cause a lack of gfs access.  It also provides for more
>> > granular monitoring of each service.
>> >
>> > I want to know how I would configure rgmanager with something similar to
>> > this - to have resource agents that continually monitor the status of a
>> > service on each node and then move service IPs accordingly.
>>
>> Just out of interest, where did the rgmanager requirement come from?
>>
>> <blatant-advertisement>
>> The Heartbeat resource manager also runs on OpenAIS now which, IIRC,
>> is what rgmanager uses... so, in theory, it can manage anything
>> rgmanager can.
>> </blatant-advertisement>
>
> I think that's still in development, but I may be wrong.

Its available and fully-functional right now (I happen to be the lead
developer :-)

http://clusterlabs.org has all the info.