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7.5.2.2 Follow Service Dependency

The follow service dependency makes use of rgmanager's RIND event scripting mechanism.

In order to activate the follow service dependency, central_processing must be enabled. Also,

the following events must be defined within the <rm> tag:

<rm>

notice("Event service triggered!");

evalfile("/usr/share/cluster/follow-service.sl");

follow_service("service:svc1", "service:svc2", "service:mastersvc");

</event>

notice("Event node triggered!");

evalfile("/usr/share/cluster/follow-service.sl");

follow_service("service:svc1", "service:svc2", "service:mastersvc");

</event>

</events>

</rm>

The event configuration for follow_service requires the following service names to be defined:

Service Description

svc1 The name of the service that should follow svc2 during a

failover operation.

svc2 The name of the service that should be followed by svc1

during a failover operation.

mastersvc The name of the service that should be started if only one

node is available.

During a failover operation, the follow service mechanism is working with the following rules:

Case 1: svc1 has to be relocated:

svc1 is relocated to a server where svc2 is not running.

If only one server is available and svc2 is running on it, svc1 will be relocated to the node only

if mastersvc==svc1,

Case 2: svc2 has to be relocated:

svc2 is relocated to the server where svc1 is running.

svc1 is relocated to another server.

If only one server is available, the service mastersvc==svc1|svc2 will be started on this node.

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Red Hat CLUSTER SUITE FOR ENTERPRISE LINUX 5.2 Guide d'installation Page 53