[Pacemaker] Configuring Dependencies and Groups in CRM

[Andrew Beekhof]

> On 17 Nov 2014, at 12:54 am, Stephan <stephan at projectlabs.de> wrote:
> 
> Hello,
> 
> I've a cluster with two nodes with a master-slave DRBD and filesystem. On top of the filesystem there are several OpenVZ containers which are managed by ocf:heartbeat:ManageVE.
> 
> Currently I've configured the VEs within one group together with DRBD and filesystem. This setup is running fine but creates a depencency between the VEs which is not neccessary and makes it impossible to stop one VE without restarting all VEs that come later in the group.
> 
> Is there any possibility to configure the filesystem as depencency for all VEs but not to define an order between the VEs? I've tried to create seperate groups for all VEs but then CRM warns that the filesystem resource is already in use.

Don't use groups. Use colocation and ordering constraints instead.

> 
> Important parts from CRM:
> 
> ------------------------------------------------------------
> primitive res_DRBD ocf:heartbeat:drbd
> primitive res_Filesystem ocf:heartbeat:Filesystem
> 
> primitive res_ve100 ocf:heartbeat:ManageVE
> primitive res_ve101 ocf:heartbeat:ManageVE
> primitive res_ve102 ocf:heartbeat:ManageVE
> primitive res_ve103 ocf:heartbeat:ManageVE
> 
> group group_VE res_Filesystem res_ve100 res_ve101 res_ve102 res_ve103
> 
> ms ms_DRBD res_DRBD
> 
> colocation col_FSDRBD inf: group_VE ms_DRBD:Master
> 
> order order_DRBDFS inf: ms_DRBD:promote group_VE:start
> ------------------------------------------------------------
> 
> Thanks, Stephan
> 
> 
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