Adding A Failover Domain - Red Hat ENTERPRISE LINUX 5 - ADMINISTRATION Manual

Chapter 5. Configuring Red Hat Cluster With system-config-cluster
Note
Failover domains are not required for operation.
By default, failover domains are unrestricted and unordered.
In a cluster with several members, using a restricted failover domain can minimize the work to set up
the cluster to run a cluster service (such as httpd), which requires you to set up the configuration
identically on all members that run the cluster service). Instead of setting up the entire cluster to
run the cluster service, you must set up only the members in the restricted failover domain that you
associate with the cluster service.
Note
To configure a preferred member, you can create an unrestricted failover domain
comprising only one cluster member. Doing that causes a cluster service to run on that
cluster member primarily (the preferred member), but allows the cluster service to fail over
to any of the other members.
The following sections describe adding a failover domain, removing a failover domain, and removing
members from a failover domain:
Section 5.6.1, "Adding a Failover Domain"
•
Section 5.6.2, "Removing a Failover Domain"
•
Section 5.6.3, "Removing a Member from a Failover Domain"
•

5.6.1. Adding a Failover Domain

To add a failover domain, follow these steps:
1. At the left frame of the Cluster Configuration Tool, click Failover Domains.
2. At the bottom of the right frame (labeled Properties), click the Create a Failover Domain button.
Clicking the Create a Failover Domain button causes the Add Failover Domain dialog box to be
displayed.
3. At the Add Failover Domain dialog box, specify a failover domain name at the Name for new
Failover Domain text box and click OK. Clicking OK causes the Failover Domain Configuration
dialog box to be displayed
Domain").
Note
The name should be descriptive enough to distinguish its purpose relative to other
names used in your cluster.
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(Figure 5.7, "Failover Domain Configuration: Configuring a Failover