Init, Fini, and Boot Methods

Three optional methods, Init, Fini, and Boot enable the RGM to execute initialization and termination code on a resource. The RGM invokes the Init method to perform a one-time initialization of the resource when the resource becomes managed—either when the resource group it is in is switched from an unmanaged to a managed state, or when it is created in a resource group that is already managed.

The RGM invokes the Fini method to clean up after the resource when the resource becomes unmanaged—either when the resource group it is in is switched to an unmanaged state or when it is deleted from a managed resource group. The clean up must be idempotent, that is, if the clean up has already been done, Fini exits 0 (success).

The RGM invokes the Boot method on nodes that have newly joined the cluster, that is, have been booted or rebooted.

The Boot method normally performs the same initialization as Init. This initialization must be idempotent, that is, if the resource has already been initialized on the local node, Boot and Init exit 0 (success).