第 12 章 Determining the order in which cluster resources are run

resource_id

The name of a resource on which an action is performed.

action

The action to be ordered on the resource. Possible values of the action property are as follows:

* start - Order start actions of the resource.

* stop - Order stop actions of the resource.

* promote - Promote the resource from an unpromoted resource to a promoted resource.

* demote - Demote the resource from a promoted resource to an unpromoted resource.

If no action is specified, the default action is start.

kind option

How to enforce the constraint. The possible values of the kind option are as follows:

* Optional - Only applies if both resources are executing the specified action. For information about optional ordering, see Configuring advisory ordering.

* Mandatory - Always enforce the constraint (default value). If the first resource you specified is stopping or cannot be started, the second resource you specified must be stopped. For information about mandatory ordering, see Configuring mandatory ordering.

* Serialize - Ensure that no two stop/start actions occur concurrently for the resources you specify. The first and second resource you specify can start in either order, but one must complete starting before the other can be started. A typical use case is when resource startup puts a high load on the host.

symmetrical option

If true, the reverse of the constraint applies for the opposite action (for example, if B starts after A starts, then B stops before A stops). Ordering constraints for which kind is Serialize cannot be symmetrical. The default value is true for Mandatory and Optional kinds, false for Serialize.