Installation guide
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. D oing 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 and modifying a failover domain:
Section 3.7.1, “ Adding a Failover Domain”
Section 3.7.2, “ Modifying a Failover Domain”
3.7.1. Adding a Failover Domain
To add a failover domain, follow the steps in this section. The starting point of the procedure is at the
cluster-specific page that you navigate to from Choose a cluster to administer displayed on
the clu st er tab.
1. At the detailed menu for the cluster (below the clu st ers menu), click Failo ver D o main s.
Clicking Failo ver Do main s causes the display of failover domains with related services and
the display of menu items for failover domains: Ad d a Failo ver Do main and Co n f ig u re a
Failo ver D o main .
2. Click Ad d a Failo ver D o main . Clicking Ad d a Failo ver Do main causes the display of the
Add a Failover Domain page.
3. At the Add a Failover Domain page, specify a failover domain name at the Failo ver
Do main Name text box.
Note
The name should be descriptive enough to distinguish its purpose relative to other
names used in your cluster.
4. To enable setting failover priority of the members in the failover domain, click the Prio rit iz ed
checkbox. With Prio rit iz ed checked, you can set the priority value, Prio rit y, for each node
selected as members of the failover domain.
Chapt er 3. Configuring Red Hat Clust er Wit h Conga
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