[Pacemaker] "Grouping" of master/slave resources

[emmanuel segura]

ms_MySQL:Master  it's not a resource just one state

2012/6/25 Stallmann, Andreas <AStallmann at conet.de>

>   Hi!****
>
> ** **
>
> We are currently switching from mysql-on-drbd with tomcat and a shared IP
> to mysql-master-slave with tomcat-master-slave and shared IP and an
> additonal cloned service (activemq).****
>
> ** **
>
> Up until now we had quite an easy setup – especially for the admins who
> did the daily maintenance. All services (exept drbd) where grouped like
> this:****
>
> ** **
>
> Resource Group: cluster_grp****
>
>      fs_r0      (ocf::heartbeat:Filesystem):    Started qs-cms-appl01****
>
>      sharedIP   (ocf::heartbeat:IPaddr2):       Started qs-cms-appl01****
>
>      database_res       (ocf::heartbeat:mysql): Started qs-cms-appl01****
>
>      tomcat_res (ocf::ucrs:tomcat):     Started qs-cms-appl01****
>
> Master/Slave Set: ms_drbd_r0****
>
>      Masters: [ qs-cms-appl01 ]****
>
>      Slaves: [ qs-cms-appl02 ]****
>
> ** **
>
> There was only one further colocation-constrain, which let fs_r0 only run
> where ms_drbd was running in Master mode. Easy.****
>
> ** **
>
> Now, with our new scenario, the situation is a little more complex. First,
> the start order:****
>
> ** **
>
> sharedIP****
>
> ms_MySQL:Master****
>
> activemq_clone****
>
> ms_tomcat:Master****
>
> ** **
>
> then the constrains:****
>
> ** **
>
> ms_MySQL:Master only where shared_IP****
>
> ms_tomcat:Master only where database****
>
> activemq_clone only where database ****
>
> ** **
>
> I thought this might be quite easy to achieve with grouping the services,
> but crm won’t let me put Master/Slave resource into a group. Why is that?
> ****
>
> ** **
>
> If I try...****
>
> ** **
>
> group cluster-grp p_writer_vip ms_MySQL:Master activemq_clone
> ms_tomcat:Master****
>
> ** **
>
> I get:****
>
> ** **
>
> ERROR: object ms_MySQL:Master does not exist****
>
> ERROR: object ms_tomcat:Master does not exist****
>
> ** **
>
> Any ideas welcome.****
>
> ** **
>
> Cheers and thanks,****
>
> ** **
>
> Andreas****
>
> ** **
>
> --
> CONET Solutions GmbH ****
>
>
>
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