[ClusterLabs] I want to have some resource monitored and based on that make an acton. Is it possible?

[Roman Hershkovich]

DB servers are not in PCS cluster. Basically you say that i need to add
them to PCS cluster and then start them? but in case if DB1 fails - DB2
autopromoted and not required start of service again>

Regarding colocation rule - i'm kind of missing logic how it works - how i
can "colocate" 1 of 2 APP servers to be around a master DB ?

On Tue, Mar 10, 2020 at 8:42 PM Strahil Nikolov <hunter86_bg at yahoo.com>
wrote:

> On March 10, 2020 7:31:27 PM GMT+02:00, Roman Hershkovich <
> warpik at gmail.com> wrote:
> >I have 2 DB servers (master/slave with replica) and 2 APP servers.
> >2 APP servers managed by pacemaker  (active/passive) , but i want also
> >to
> >monitor "which DB is master".  I can't use VIP (which could be sticked
> >on
> >master DB) - it is very limited virtual environment.
> >
> >Is it possible to create a rule or some other scenario, so in case if
> >master moved - pacemaker will restart APP (app does not support
> >failover) ?
>
> Hi Roman,
>
> If you set an order rule that  starts  first the master  and then the app,
> during a failover  the app will be stoped  and once the master  is
> switched  (slave is promoted) the  app will be started again.
>
> Also you can consider  a  colocation rule that all  apps are  started
> where  the master  DB is running  -  so the lattency will be minimal.
>
> Best Regards,
> Strahil Nikolov
>
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