ansible作为运维利器十分方便，如果部署服务，尽量用串行比较保险。答案来自 stackoverflow

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You can use the forks with adhoc command and serial: 1 inside the playbook.

On adhoc command:

ansible aws -a "hostname" --forks=1

Inside the playbook:

- hosts: aws
  become: yes
  gather_facts: yes
  serial: 1
  tasks:
    - YOUR TASKS HERE

ansible设置串行的方法