ansible:针对一组主机(多个托管主机)运行 playbook 时仅执行一次 local_action

ansible:针对一组主机(多个托管主机)运行 playbook 时仅执行一次 local_action

local_action在针对一组主机运行剧本时,是否可以在 ansible 中使任务仅运行一次?

问题如下:

hosts:
    - macbooks
    - localhost
tasks:

#...<some_remote_tasks>...#

    - local_action: command
        ssh-keygen -o -a 100 -t ed25519 -f {{ ssh_key }} -q -N ''
      become: yes

结果:

fatal: [laptop -> localhost]: FAILED! => {"changed": true, "cmd": ["ssh-keygen", "-o", "-a", "100", "-t", "ed25519", "-f", "/etc/ssh/id_ed25519-HostCA", "-q", "-N", "", "-C", "SSH Host Certificate Authority for cypherpunk.synology.me"], "delta": "0:00:00.014818", "end": "2018-06-01 17:02:41.599111", "msg": "non-zero return code", "rc": 1, "start": "2018-06-01 17:02:41.584293", "stderr": "", "stderr_lines": [], "stdout": "/etc/ssh/id_ed25519-HostCA already exists.\nOverwrite (y/n)? ", "stdout_lines": ["/etc/ssh/id_ed25519-HostCA already exists.", "Overwrite (y/n)? "]}
changed: [localhost -> localhost] 

这是有道理的,因为剧本中的任何任务都必须为每个托管主机运行。

但因为它是一个本地操作,所以它第一次按预期运行并创建密钥文件。第二次运行该文件已经存在,ansible 收到错误:"/etc/ssh/id_ed25519-HostCA already exists. Overwrite (y/n)?"with return code 1。所以实际上它只能运行一次(至少在这种情况下)。

我可以做类似的事情:

- local_action: shell >
         [[ ! -f {{ ssh_key }} ]] && \
         ssh-keygen -o -a 100 -t ed25519 -f {{ ssh_key }} -q -N ''; \
         exit 0
      become: yes

但我想知道是否有 ansible 推荐的解决方案?你们将如何解决这个问题?

答案1

也许你应该检查:run_once&delegate_to

- command: /opt/application/upgrade_db.py
  run_once: true
  delegate_to: web01.example.org

文件:https://docs.ansible.com/ansible/latest/user_guide/playbooks_delegation.html

亲切的问候,

C

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