[ClusterLabs] Pacemaker for 389 directory server with multi-master replication

[Andreas Kurz]

Hello,

On Sat, Feb 20, 2016 at 1:50 PM, Bernie Jones <
bernie at securityconsulting.ltd.uk> wrote:

> Hi all,
>
>
>
> I’m new to this list and fairly new to pacemaker and have just spent a
> couple of days trying unsuccessfully to solve a configuration challenge.
>
>
>
> I have seen a relevant post on this list from around four years ago but it
> doesn’t seem to have helped – here’s what I want to do.
>
>
>
> I have 389 directory server running on two Centos servers. It’s configured
> for MMR and my plan is to use one replica as the primary LDAP server,
> failing over to the secondary only if there’s a problem. This is to avoid
> frequent writes to both replicas causing high levels of bi-directional
> replication traffic. SO I’m looking for failover rather than load balancing.
>
>
>
> This works fine using a traditional load balancer configured appropriately
> for weighting and stickiness with a simple heartbeat to the LDAP server but
> I’d like to see if I can use Pacemaker instead using a floating IP across
> the two LDAP servers and appropriate monitoring to control switch over.
>
>
>
> I’ve configured a floating IP resource OK but am struggling with the
> question of how to monitor the 389 server.
>
>
>
> If I create a resource using lsb:dirsrv then I find that the server is
> started up on the primary cluster node but not on the second – which is
> understandable but not what I need.
>
>
>
> What I would like to be able to achieve is to have the 389 instances
> monitored but not controlled such that the floating IP address switches
> across when required but without stopping or starting the 389 instances.
>

I'd say you want to create a clone resource from your 389 resource, so
there is one instance running on each node.

Regards,
Andreas


> Right now I’m not sure whether I should be using the dirsrv resource or
> looking for some kind of simple ‘LDAP ping’ resource that could be used.
>
>
>
> Any advice would be hugely appreciated.
>
>
>
> Kind regards,
>
> Bernie
>
>
>
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