--- # this is an example of how we can perform actions on a given host on behalf of all the hosts # in a play. # # The two main uses of this would be signalling an outage window for hosts that # we are going to start upgrading, or to take a machine out of rotation by talking to a load # balancer. # # This example cheats by replacing the load balancer script with the 'echo' command, # leaving actual communication with the load balancer as an exercise to the reader. In reality, # you could call anything you want, the main thing is that it should do something with # $inventory_hostname # NOTE: see batch_size_control.yml for an example of the 'serial' keyword, which you almost certainly # want to use in this kind of example. Here we have a mocked up example that does something to # 5 hosts at a time - hosts: all serial: 5 tasks: - name: take the machine out of rotation action: command echo taking out of rotation $inventory_hostname delegate_to: 127.0.0.1 - name: do several things on the actual host action: command echo hi mom $inventory_hostname - name: put machine back into rotation action: command echo inserting into rotation $inventory_hostname delegate_to: 127.0.0.1