Cluster administration

You can manually migrate cluster resources from one node to another with the following command as root user:

root@prihana ~]# pcs resource move SAPHana_HDB_00-master
Warning: Creating location constraint cli-ban-SAPHana_HDB_00-
master-on-prihana with a score of -INFINITY for resource 
SAPHana_HDB_00-master on node prihana.
This will prevent SAPHana_HDB_00-master from running on prihana 
until the constraint is removed. This will be the case even if 
prihana is the last node in the cluster.

You can check the status of the cluster again to verify the status of resource migration.

[root@prihana ~]#pcs status
Thu Nov 12 10:45:14 2020

Cluster name: rhelhanaha
Stack: corosync
Current DC: sechana (version 1.1.19-8.el7_6.5-c3c624ea3d) - partition with quorum
Last updated: Thu Nov 12 10:45:14 2020
Last change: Thu Nov 12 10:45:06 2020 by root via crm_attribute on sechana

2 nodes configured
6 resources configured

Online: [ prihana sechana ]

Full list of resources:

 clusterfence   (stonith:fence_aws):    Started prihana
 Clone Set: SAPHanaTopology_HDB_00-clone [SAPHanaTopology_HDB_00]
     Started: [ prihana sechana ]
 Master/Slave Set: SAPHana_HDB_00-master [SAPHana_HDB_00]
     Masters: [ sechana ]
     Stopped: [ prihana ]
 hana-oip       (ocf::heartbeat:aws-vpc-move-ip):       Started sechana

Daemon Status:
  corosync: active/enabled
  pacemaker: active/enabled
  pcsd: active/enabled

Clean up the failed actions as shown in next section. With each pcs resource move command invocation, the cluster creates location constraints to cause the resource to move. These constraints must be removed to allow automated failover in the future. To remove the constraints created by the move, run the following command:

root@prihana ~]# pcs resource clear SAPHana_HDB_00-master

Check the status of the cluster:

root@prihana ~]# pcs status
Cluster name: rhelhanaha
Stack: corosync
Current DC: sechana (version 1.1.19-8.el7_6.5-c3c624ea3d) - partition with quorum
Last updated: Thu Nov 12 10:49:44 2020
Last change: Thu Nov 12 10:49:12 2020 by root via crm_attribute on sechana

2 nodes configured
6 resources configured

Online: [ prihana sechana ]

Full list of resources:

 clusterfence   (stonith:fence_aws):    Started prihana
 Clone Set: SAPHanaTopology_HDB_00-clone [SAPHanaTopology_HDB_00]
     Started: [ prihana sechana ]
 Master/Slave Set: SAPHana_HDB_00-master [SAPHana_HDB_00]
     Masters: [ sechana ]
     Slaves: [ prihana ]
 hana-oip       (ocf::heartbeat:aws-vpc-move-ip):       Started sechana

Daemon Status:
  corosync: active/enabled
  pacemaker: active/enabled
  pcsd: active/enabled