Backing Up And Restoring The Cluster Database - Red Hat ENTERPRISE LINUX 4 - ADMINISTRATION Manual

Chapter 6. Managing Red Hat Cluster With system-config-cluster
Important
If you are changing the number of cluster members, refer to
Deleting Members". You must take into account certain circumstances for both DLM and
GULM clusters when adding or deleting members.
To edit the cluster configuration file, click the Cluster Configuration tab in the cluster configuration
GUI. Clicking the Cluster Configuration tab displays a graphical representation of the cluster
configuration. Change the configuration file according the the following steps:
1. Make changes to cluster elements (for example, create a service).
2. Propagate the updated configuration file throughout the cluster by clicking Send to Cluster.
Note
The Cluster Configuration Tool does not display the Send to Cluster button if
the cluster is new and has not been started yet, or if the node from which you are
running the Cluster Configuration Tool is not a member of the cluster. If the Send
to Cluster button is not displayed, you can still use the Cluster Configuration Tool;
however, you cannot propagate the configuration. You can still save the configuration
file. For information about using the Cluster Configuration Tool for a new cluster
configuration, refer to
cluster.
3. Clicking Send to Cluster causes a Warning dialog box to be displayed. Click Yes to save and
propagate the configuration.
4. Clicking Yes causes an Information dialog box to be displayed, confirming that the current
configuration has been propagated to the cluster. Click OK.
5. Click the Cluster Management tab and verify that the changes have been propagated to the
cluster members.

6.4. Backing Up and Restoring the Cluster Database

The Cluster Configuration Tool automatically retains backup copies of the three most recently used
configuration files (besides the currently used configuration file). Retaining the backup copies is useful
if the cluster does not function correctly because of misconfiguration and you need to return to a
previous working configuration.
Each time you save a configuration file, the Cluster Configuration Tool saves backup copies
of the three most recently used configuration files as /etc/cluster/cluster.conf.bak.1,
/etc/cluster/cluster.conf.bak.2, and /etc/cluster/cluster.conf.bak.3. The
backup file /etc/cluster/cluster.conf.bak.1 is the newest backup, /etc/cluster/
cluster.conf.bak.2 is the second newest backup, and /etc/cluster/cluster.conf.bak.3
is the third newest backup.
If a cluster member becomes inoperable because of misconfiguration, restore the configuration file
according to the following steps:
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Chapter 5, Configuring Red Hat Cluster With system-config-
Section 5.5, "Adding and