Installation guide

8. You may skip this step (restarting cluster software) if you have made only the following
configuration changes:
Deleting a node from the cluster configuration—except where the node count changes
from greater than two nodes to two nodes. For information about deleting a node from a
cluster and transitioning from greater than two nodes to two nodes, refer to Section 8.2,
“ Deleting or Adding a Node” .
Adding a node to the cluster configuration—except where the node count changes from
two nodes to greater than two nodes. For information about adding a node to a cluster
and transitioning from two nodes to greater than two nodes, refer to Section 8.2.2,
“ Adding a Node to a Cluster”.
Changes to how daemons log information.
HA service/VM maintenance (adding, editing, or deleting).
Resource maintenance (adding, editing, or deleting).
Failover domain maintenance (adding, editing, or deleting).
Otherwise, you must restart the cluster software as follows:
a. At each node, stop the cluster software according to Section 8.1.2, “Stopping Cluster
Software” .
b. At each node, start the cluster software according to Section 8.1.1, “ Starting Cluster
Software” .
Stopping and starting the cluster software ensures that any configuration changes that are
checked only at startup time are included in the running configuration.
9. Verify that that the nodes are functioning as members in the cluster and that the HA services
are running as expected.
a. At any cluster node, run cman_too l no d es 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_to o l no d es
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
b. At any node, using the cl ustat utility, verify that the HA services are running as
expected. In addition, cl ustat 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,
Red Hat Ent erprise Linux 6 Clust er Administ rat ion
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