Installation guide

Chapter 6. Managing Red Hat High Availability Add-On With ccs
This chapter describes various administrative tasks for managing the Red Hat High Availability Add-
On by means of the ccs command, which is supported as of the Red Hat Enterprise Linux 6.1 release
and later. This chapter consists of the following sections:
Section 6.1, “ Managing Cluster Nodes”
Section 6.2, “ Starting and Stopping a Cluster”
Section 6.3, “ Diagnosing and Correcting Problems in a Cluster”
6.1. Managing Clust er Nodes
This section documents how to perform the following node-management functions with the ccs
command:
Section 6.1.1, “ Causing a Node to Leave or Join a Cluster”
Section 6.1.2, “ Adding a Member to a Running Cluster”
6.1.1. Causing a Node t o Leave or Join a Clust er
You can use the ccs command to cause a node to leave a cluster by stopping cluster services on
that node. Causing a node to leave a cluster does not remove the cluster configuration information
from that node. Making a node leave a cluster prevents the node from automatically joining the
cluster when it is rebooted.
To cause a node to leave a cluster, execute the following command, which stops cluster services on
the node specified with the -h option:
ccs -h host --stop
When you stop cluster services on a node, any service that is running on that node will fail over.
To delete a node entirely from the cluster configuration, use the --rmnod e option of the ccs
command, as described in Section 5.4, “ Creating and Modifying a Cluster”.
To cause a node to rejoin a cluster execute the following command, which starts cluster services on
the node specified with the -h option:
ccs -h host --start
6.1.2. Adding a Member t o a Running Clust er
To add a member to a running cluster, add a node to the cluster as described in Section 5.4,
“ Creating and Modifying a Cluster”. After updating the configuration file, propagate the file to all
nodes in the cluster and be sure to activate the new cluster configuration file, as described in
Section 5.15, “Propagating the Configuration File to the Cluster Nodes” .
6.2. St art ing and St opping a Clust er
Red Hat Ent erprise Linux 6 Clust er Administ rat ion
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