[ClusterLabs] resource cloned group colocations

[Klaus Wenninger]

On Thu, Mar 2, 2023 at 8:41 AM Gerald Vogt <vogt at spamcop.net> wrote:

> Hi,
>
> I am setting up a mail relay cluster which main purpose is to maintain
> the service ips via IPaddr2 and move them between cluster nodes when
> necessary.
>
> The service ips should only be active on nodes which are running all
> necessary mail (systemd) services.
>
> So I have set up a resource for each of those services, put them into a
> group in order they should start, cloned the group as they are normally
> supposed to run on the nodes at all times.
>
> Then I added an order constraint
>    start mail-services-clone then start mail1-ip
>    start mail-services-clone then start mail2-ip
>
> and colocations to prefer running the ips on different nodes but only
> with the clone running:
>
>    colocation add mail2-ip with mail1-ip -1000
>    colocation ip1 with mail-services-clone
>    colocation ip2 with mail-services-clone
>
> as well as a location constraint to prefer running the first ip on the
> first node and the second on the second
>
>    location ip1 prefers ha1=2000
>    location ip2 prefers ha2=2000
>
> Now if I stop pacemaker on one of those nodes, e.g. on node ha2, it's
> fine. ip2 will be moved immediately to ha3. Good.
>
> However, if pacemaker on ha2 starts up again, it will immediately remove
> ip2 from ha3 and keep it offline, while the services in the group are
> starting on ha2. As the services unfortunately take some time to come
> up, ip2 is offline for more than a minute.
>
> It seems the colocations with the clone are already good once the clone
> group begins to start services and thus allows the ip to be removed from
> the current node.
>

To achieve this you have to add orders on top of collocations.

Klaus


>
> I was wondering how can I define the colocation to be accepted only if
> all services in the clone have been started? And not once the first
> service in the clone is starting?
>
> Thanks,
>
> Gerald
>
>
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