Cluster Constraints

Ordering Constraints

Set up the constraints which services need to run on the same machine

#if node gets drbd master for sync, mount /sync there
pcs constraint order promote ClusterDataSyncS  then start ClusterDataSyncFS kind=Mandatory

#start mounting /sync if drbd gets started
pcs constraint order start   ClusterDataSyncFS then start openvpn-server    kind=Mandatory

#start the oVirt manager VM on the node that is DRBD master of the virt device (VM root hd)
pcs constraint order promote ClusterDataVirtS  then start vm-guest1         kind=Mandatory

#start OpenVPN if IPs get available
pcs constraint order start   ClusterIP         then start openvpn-server    kind=Mandatory

#start the IP addresses on the node where the PostgreSQL server is master
pcs constraint order promote msPostgresql      then start IP-Group          score=INFINITY symmetrical=false

#stop IP resources if the PostgreSQL server migrates inside the cluster
pcs constraint order demote  msPostgresql      then stop  IP-Group          score=0        non-symmetrical=false

Colocation Constraints

#oVirt root hd has to be on the same node as the PostgreSQL master
pcs constraint colocation add ClusterDataVirtS  with msPostgresql      rsc-role=Started with-rsc-role=Master score=INFINITY

#/sync has to be on the same node as PostgreSQL master
pcs constraint colocation add ClusterDataSyncS  with msPostgresql      rsc-role=Started with-rsc-role=Master score=INFINITY

#/sync filesystem has to be on the same node as DRBD master
pcs constraint colocation add ClusterDataSyncFS with ClusterDataSyncS  rsc-role=Started with-rsc-role=Master score=INFINITY

#IP addresses have to be on the same node as PostgreSQL
pcs constraint colocation add IP-Group          with msPostgresql      rsc-role=Started with-rsc-role=Master score=INFINITY

#OpenVPN needs to access the config on /sync
pcs constraint colocation add openvpn-server    with ClusterDataSyncFS                                       score=INFINITY

#oVirt VM has to be on the same node as its root disk
pcs constraint colocation add vm-guest1         with ClusterDataVirtS  rsc-role=Started with-rsc-role=Master score=INFINITY