Red Hat CLUSTER FOR ENTERPRISE LINUX 5.0 Configuration Manual page 86

Chapter 5. Configuring Red Hat Cluster With
a Failover Domain"
5. Autostart This Service checkbox — This is checked by default. If Autostart This Service is
checked, the service is started automatically when a cluster is started and running. If
Autostart This Service is not checked, the service must be started manually any time the
cluster comes up from stopped state.
6. Run Exclusive 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, Run Exclusive 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 Run Exclusive unchecked.
Note
Circumstances that require enabling Run Exclusive are rare. Enabling Run
Exclusive can render a service offline if the node it is running on fails and no
other nodes are empty.
7. Select a recovery policy to specify how the resource manager should recover from a service
failure. At the upper right of the Service Management dialog box, there are three Recovery
Policy options available:
• Restart — Restart the service in the node the service is currently located. The default
setting is Restart. If the service cannot be restarted in the current node, the service is
relocated.
• Relocate — Relocate the service before restarting. Do not restart the node where the
service is currently located.
• Disable — Do not restart the service at all.
8. Click the Add a Shared Resource to this service button and choose the a resource listed
that you have configured in
Note
If you are adding a Samba-service resource, connect a Samba-service resource
directly to the service, not to a resource within a service. That is, at the Service
Management dialog box, use either Create a new resource for this service or
Add a Shared Resource to this service; do not use Attach a new Private
Resource to the Selection or Attach a Shared Resource to the selection.
76
for instructions on how to configure a failover domain.)
Section 7, "Adding Cluster
system-config-cluster
Resources".