Installation guide

38 Chapter 3. Installing and Conﬁguring Red Hat Cluster Suite Software

• Managed Resources — Deﬁnes failover domains, resources, and services.

• Failover Domains — Use this section to conﬁgure one or more subsets of cluster

nodes used to run a service in the event of a node failure. Failover domains are rep-

resented as subordinate elements under Failover Domains. Using conﬁguration but-

tons at the bottom of the right frame (below Properties), you can create failover do-

mains (when Failover Domains is selected) or edit failover domain properties (when

a failover domain is selected).

• Resources — Use this section to conﬁgure resources to be managed by the system.

Choose from the available list of ﬁle systems, IP addresses, NFS mounts and exports,

and user-created scripts and conﬁgure them individually. Resources are represented

as subordinate elements under Resources. Using conﬁguration buttons at the bottom

of the right frame (below Properties), you can create resources (when Resources is

selected) or edit resource properties (when a resource is selected).

• Services — Use this section to create and conﬁgure services that combine cluster

resources, nodes, and failover domains as needed. Services are represented as subor-

dinate elements under Services. Using conﬁguration buttons at the bottom of the right

frame (below Properties), you can create services (when Services is selected) or edit

service properties (when a service is selected).

Warning

Do not manually edit the contents of the /etc/cluster/cluster.conf ﬁle without guid-

ance from an authorized Red Hat representative or unless you fully understand the con-

sequences of editing the /etc/cluster/cluster.conf ﬁle manually.

Figure 3-2 shows the hierarchical relationship among cluster conﬁguration components.

The cluster comprises cluster nodes. The cluster nodes are connected to one or more fenc-

ing devices. Nodes can be separated by failover domains to a cluster service. The services

comprise managed resources such as NFS exports, IP addresses, and shared GFS partitions.

The structure is ultimately reﬂected in the /etc/cluster/cluster.conf XML struc-

ture. The Cluster Conﬁguration Tool provides a convenient way to create and manipulate

the /etc/cluster/cluster.conf ﬁle.