ansible/examples/playbooks/batch_size_control.yml

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# ordinarily, without the 'serial' keyword set, ansible will control all of your machines in a play at once, in parallel.
# if you want to perform a rolling update, so that each play completes all the way through on a certain number of hosts
# before moving on to the remaining hosts, use the 'serial' keyword like so:
---
- hosts: all
serial: 3
# now each of the tasks below will complete on 3 hosts before moving on to the next 3, regardless of how many
# hosts are selected by the "hosts:" line
tasks:
- name: ping
action: ping
- name: ping2
action: ping