[ClusterLabs] I want to have some resource monitored and based on that make an acton. Is it possible?
warpik at gmail.com
Tue Mar 10 15:03:27 EDT 2020
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>
> 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
> >monitor "which DB is master". I can't use VIP (which could be sticked
> >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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