Installation guide

Fig u re 5.9 . Add in g a Clu st er Service
4. If you want to restrict the members on which this cluster service is able to run, choose a
failover domain from the Failo ver Do main drop-down box. (Refer to Section 5.6,
“ Configuring a Failover Domain” for instructions on how to configure a failover domain.)
5. Au t o st art T h is Service checkbox — This is checked by default. If Au t o st art T h is
Service is checked, the service is started automatically when a cluster is started and
running. If Au t o st art T h is Service is not checked, the service must be started manually any
time the cluster comes up from stopped state.
6. Ru n Exclu sive checkbox — This sets a policy wherein the service only runs on nodes that
have no other services running on them. For example, for a very busy web server that is
clustered for high availability, it would would be advisable to keep that service on a node
alone with no other services competing for his resources — that is, Ru n Exclu sive checked.
On the other hand, services that consume few resources (like NFS and Samba), can run
together on the same node without little concern over contention for resources. For those
types of services you can leave the Ru n Exclu sive unchecked.
Red Hat Ent erprise Linux 5 Clust er Administ rat ion
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