Installation guide

Important
Although the Clu st er C o n f ig u rat io n T o o l provides a Q u o ru m Vo t es parameter in the
Properties dialog box of each cluster member, that parameter is intended only for use
during initial cluster configuration. Furthermore, it is recommended that you retain the default
Q u o ru m Vo t es value of 1. For more information about using the Clu st er Co n f ig u rat io n
T o o l, refer to Chapter 5, Configuring Red Hat Cluster With system-config-cluster.
To edit the cluster configuration file, click the Clu st er Co n f ig u rat io n tab in the cluster
configuration GUI. Clicking the Clu st er Co n f ig u rat io n tab displays a graphical representation of
the cluster configuration. Change the configuration file according 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 Clu st er Co n f ig u rat io n T o o l 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 Clu st er Co n f ig u rat io n T o o l is not a member of the cluster. If the Send
to Cluster button is not displayed, you can still use the Clu st er C o n f ig u rat io n
T o o l; however, you cannot propagate the configuration. You can still save the
configuration file. For information about using the Clu st er Co n f ig u rat io n T o o l for
a new cluster configuration, refer to Chapter 5, Configuring Red Hat Cluster With
system-config-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 Clu st er Man ag emen t tab and verify that the changes have been propagated to
the cluster members.
6.4 . Backing Up and Rest oring t he Clust er Dat abase
The Clu st er Co n f ig u rat io n T o o l 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 Clu st er C o n f ig u rat io n T o o l 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.
⁠Chapt er 6 . Managing Red Hat Clust er Wit h syst em- config- clust er
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