B.2. Actions

All OCF resource agents are required to implement the following actions.

Table B.1. Required Actions for OCF Agents

Action	Description	Instructions
`start`	Start the resource	Return 0 on success and an appropriate error code otherwise. Must not report success until the resource is fully active.
`stop`	Stop the resource	Return 0 on success and an appropriate error code otherwise. Must not report success until the resource is fully stopped.
`monitor`	Check the resource’s state	Exit 0 if the resource is running, 7 if it is stopped, and anything else if it is failed. NOTE: The monitor script should test the state of the resource on the local machine only.
`meta-data`	Describe the resource	Provide information about this resource as an XML snippet. Exit with 0. NOTE: This is not performed as root.
`validate-all`	Verify the supplied parameters	Return 0 if parameters are valid, 2 if not valid, and 6 if resource is not configured.

Additional requirements (not part of the OCF specification) are placed on agents that will be used for advanced concepts such as clones and multi-state resources.

Table B.2. Optional Actions for OCF Resource Agents

Action	Description	Instructions
`promote`	Promote the local instance of a multi-state resource to the master (primary) state.	Return 0 on success
`demote`	Demote the local instance of a multi-state resource to the slave (secondary) state.	Return 0 on success
`notify`	Used by the cluster to send the agent pre- and post-notification events telling the resource what has happened and will happen.	Must not fail. Must exit with 0

One action specified in the OCF specs, recover, is not currently used by the cluster. It is intended to be a variant of the start action that tries to recover a resource locally.

Important

If you create a new OCF resource agent, use ocf-tester to verify that the agent complies with the OCF standard properly.