serial.yml

---
- name: Test serial
  hosts: test
  serial: 2
  tasks:
    - name: task1
      ping:

    - name: task2
      ping:

    - name: task3
      ping:

############################# Output ############################################

#PLAY [Test serial] *************************************************************
#
#TASK [setup] *******************************************************************
#ok: [hoge1.example.com]
#ok: [hoge2.example.com]
#
#TASK [task1] *******************************************************************
#ok: [hoge1.example.com] => {"changed": false, "ping": "pong"}
#ok: [hoge2.example.com] => {"changed": false, "ping": "pong"}
#
#TASK [task2] *******************************************************************
#ok: [hoge1.example.com] => {"changed": false, "ping": "pong"}
#ok: [hoge2.example.com] => {"changed": false, "ping": "pong"}
#
#TASK [task3] *******************************************************************
#ok: [hoge1.example.com] => {"changed": false, "ping": "pong"}
#ok: [hoge2.example.com] => {"changed": false, "ping": "pong"}
#
#PLAY [Test serial] *************************************************************
#
#TASK [setup] *******************************************************************
#ok: [hoge3.example.com]
#ok: [hoge4.example.com]
#
#TASK [task1] *******************************************************************
#ok: [hoge4.example.com] => {"changed": false, "ping": "pong"}
#ok: [hoge3.example.com] => {"changed": false, "ping": "pong"}
#
#TASK [task2] *******************************************************************
#ok: [hoge4.example.com] => {"changed": false, "ping": "pong"}
#ok: [hoge3.example.com] => {"changed": false, "ping": "pong"}
#
#TASK [task3] *******************************************************************
#ok: [hoge4.example.com] => {"changed": false, "ping": "pong"}
#ok: [hoge3.example.com] => {"changed": false, "ping": "pong"}
#
#PLAY RECAP *********************************************************************
#hoge2.example.com : ok=4    changed=0    unreachable=0    failed=0
#hoge1.example.com : ok=4    changed=0    unreachable=0    failed=0
#hoge3.example.com : ok=4    changed=0    unreachable=0    failed=0
#hoge4.example.com : ok=4    changed=0    unreachable=0    failed=0