[Pacemaker] "Grouping" of master/slave resources

[Andreas Kurz]

On 06/25/2012 06:14 PM, Stallmann, Andreas wrote:
> 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?

Groups can only contain primitive resources, though you could clone a
group or have a master-slave group.

You can use resource-sets to create constraints containing primitives
and master-slave resources quite similar to the way groups work.

Regards,
Andreas

-- 
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> 
>  
> 
> 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
> 
>  
> 
> --
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> 
>  
> 
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