31.2. Manually moving cluster resources

You can override the cluster and force resources to move from their current location. There are two occasions when you would want to do this:

To move all resources running on a node to a different node, you put the node in standby mode. For information about putting a cluster node in standby node, see Putting a node in standby mode.

You can move individually specified resources in either of the following ways.

Moving a resource from its current node

To move a resource off the node on which it is currently running, use the following command, specifying the resource_id of the resource as defined. Specify the destination_node if you want to indicate on which node to run the resource that you are moving.

# pcs resource move resource_id [destination_node] [--promoted] [--strict] [--wait[=n]]

When you execute the pcs resource move command, this adds a constraint to the resource to prevent it from running on the node on which it is currently running. By default, the location constraint that the command creates is automatically removed once the resource has been moved. If removing the constraint would cause the resource to move back to the original node, as might happen if the resource-stickiness value for the resource is 0, the pcs resource move command fails. If you would like to move a resource and leave the resulting constraint in place, use the pcs resource move-with-constraint command.

Moving a resource to its preferred node

After a resource has moved, either due to a failover or to an administrator manually moving the node, it will not necessarily move back to its original node even after the circumstances that caused the failover have been corrected. To relocate resources to their preferred node, use the following command. A preferred node is determined by the current cluster status, constraints, resource location, and other settings and may change over time.

# pcs resource relocate run [resource1] [resource2] ...

If you do not specify any resources, all resource are relocated to their preferred nodes.

This command calculates the preferred node for each resource while ignoring resource stickiness. After calculating the preferred node, it creates location constraints which will cause the resources to move to their preferred nodes. Once the resources have been moved, the constraints are deleted automatically. To remove all constraints created by the pcs resource relocate run command, you can enter the pcs resource relocate clear command. To display the current status of resources and their optimal node ignoring resource stickiness, enter the pcs resource relocate show command.