[root@example-01 ~]# service rgmanager stop
Stopping Cluster Service Manager: [ OK ]
[root@example-01 ~]# service gfs2 stop
Unmounting GFS2 filesystem (/mnt/gfsA): [ OK ]
Unmounting GFS2 filesystem (/mnt/gfsB): [ OK ]
[root@example-01 ~]# service clvmd stop
Signaling clvmd to exit [ OK ]
clvmd terminated [ OK ]
[root@example-01 ~]# service cman stop
Stopping cluster:
Leaving fence domain... [ OK ]
Stopping gfs_controld... [ OK ]
Stopping dlm_controld... [ OK ]
Stopping fenced... [ OK ]
Stopping cman... [ OK ]
Waiting for corosync to shutdown: [ OK ]
Unloading kernel modules... [ OK ]
Unmounting configfs... [ OK ]
[root@example-01 ~]#
At any node in the cluster, edit the /etc/cluster/cluster.conf file.
Update the config_version attribute by incrementing its value (for example, changing from config_version="2" to config_version="3">).
Save /etc/cluster/cluster.conf.
Validate the updated file against the cluster schema (cluster.rng) by running the ccs_config_validate command. For example:
[root@example-01 ~]# service cman start
Starting cluster:
Checking Network Manager... [ OK ]
Global setup... [ OK ]
Loading kernel modules... [ OK ]
Mounting configfs... [ OK ]
Starting cman... [ OK ]
Waiting for quorum... [ OK ]
Starting fenced... [ OK ]
Starting dlm_controld... [ OK ]
Starting gfs_controld... [ OK ]
Unfencing self... [ OK ]
Joining fence domain... [ OK ]
[root@example-01 ~]# service clvmd start
Starting clvmd: [ OK ]
Activating VG(s): 2 logical volume(s) in volume group "vg_example" now active
[ OK ]
[root@example-01 ~]# service gfs2 start
Mounting GFS2 filesystem (/mnt/gfsA): [ OK ]
Mounting GFS2 filesystem (/mnt/gfsB): [ OK ]
[root@example-01 ~]# service rgmanager start
Starting Cluster Service Manager: [ OK ]
[root@example-01 ~]#
At any cluster node, run cman_tools nodes to verify that the nodes are functioning as members in the cluster (signified as "M" in the status column, "Sts"). For example:
[root@example-01 ~]# cman_tool nodes
Node Sts Inc Joined Name
1 M 548 2010-09-28 10:52:21 node-01.example.com
2 M 548 2010-09-28 10:52:21 node-02.example.com
3 M 544 2010-09-28 10:52:21 node-03.example.com
At any node, using the clustat utility, verify that the HA services are running as expected. In addition, clustat displays status of the cluster nodes. For example:
[root@example-01 ~]#clustat
Cluster Status for mycluster @ Wed Nov 17 05:40:00 2010
Member Status: Quorate
Member Name ID Status
------ ---- ---- ------
node-03.example.com 3 Online, rgmanager
node-02.example.com 2 Online, rgmanager
node-01.example.com 1 Online, Local, rgmanager
Service Name Owner (Last) State
------- ---- ----- ------ -----
service:example_apache node-01.example.com started
service:example_apache2 (none) disabled
If the cluster is running as expected, you are done updating the configuration.
