需要代码来使用 Ansible 检查服务器连接

Question

下面是我如何调用我的 ansible 游戏

ansible-playbook -v -i /web/admin/playbooks/applist.hosts /web/admin/playbooks/restart.yml -e ENV=dev -e ACTION=start --tags checkserver

下面是我的剧本：

- hosts: "{{ENV}}_*"
  user: "{{USER}}"
  gather_facts: yes
  pre_tasks:

       - name: Check PING
         ping:
         tags: checkserver


- hosts: "{{ENV}}_*"
  user: "{{USER}}"
  gather_facts: yes
  pre_tasks:

       - name: Check if all hosts are reachable
         fail:
           msg: >
             [REQUIRED] ALL hosts to be reachable, so flagging {{ inventory_hostname }} as failed,
              because host {{ item }} has no facts, meaning it is UNREACHABLE.
         when: hostvars[item].ansible_facts is defined
         with_items: "{{ ansible_play_hosts }}"
         run_once: true
         tags: checkserver

我确定那里的连接良好并且目标主机可以访问。

从下面成功的ansible ping 模块输出中可以看出这一点：

PLAY [dev_*] *******************************************************************

TASK [Gathering Facts] *********************************************************
[1;35m[WARNING]: Platform sunos on host remotehost7.com is using the[0m
[1;35mdiscovered Python interpreter at /usr/bin/python, but future installation of[0m
[1;35manother Python interpreter could change the meaning of that path. See https://d[0m
[1;35mocs.ansible.com/ansible/2.10/reference_appendices/interpreter_discovery.html[0m
[1;35mfor more information.[0m
[0;32mok: [remotehost7.com][0m

PLAY [dev_*] *******************************************************************

TASK [Gathering Facts] *********************************************************
[0;32mok: [remotehost7.com][0m

TASK [Check PING] **************************************************************
[0;32mok: [remotehost7.com] => {"changed": false, "ping": "pong"}[0m

PLAY [dev_*] *******************************************************************

TASK [Gathering Facts] *********************************************************
[0;32mok: [remotehost7.com][0m

TASK [Check if all hosts are reachable] ****************************************
[0;31mfailed: [remotehost7.com] (item=remotehost7.com) => {"ansible_loop_var": "item", "changed": false, "item": "remotehost7.com", "msg": "[REQUIRED] ALL hosts to be reachable, so flagging remotehost7.com as failed,\n because host remotehost7.com has no facts, meaning it is UNREACHABLE.\n"}[0m

NO MORE HOSTS LEFT *************************************************************

PLAY RECAP *********************************************************************
[0;31mremotehost7.com[0m    : [0;32mok=4   [0m changed=0    unreachable=0    [0;31mfailed=1   [0m skipped=0    rescued=0    ignored=0   

我在此处从 stackoverflow 获取代码：Ansible: Abort Execution if a host is unreachable

我使用的是 ansible 版本 2.9.x

注意：这段代码曾经在旧版本的 ansible 上运行良好，比如 2.4

你能推荐一下吗？

Answer 1

当ansible_facts 被定义时，你明显失败了，这通常意味着主机是可访问的。也许你只是把你的逻辑倒退了？我想你的意思是：

- name: Check if all hosts are reachable
  fail:
    msg: >
      [REQUIRED] ALL hosts to be reachable, so flagging {{ inventory_hostname }} as failed,
       because host {{ item }} has no facts, meaning it is UNREACHABLE.
  when: hostvars[item].ansible_facts is not defined
  with_items: "{{ ansible_play_hosts }}"
  run_once: true
  tags: checkserver

但即使逻辑固定，我认为这不会让你得到任何东西： 您正在迭代 ansible_play_hosts，并从 documentation:

ansible_play_hosts

当前播放运行的主机列表，不受序列号限制。此列表中排除了失败/无法访问的主机。

也就是说，无法访问的主机不会包含在 anisble_play_hosts，所以你的任务是检查是否可达 主机是可访问的，这将永远是正确的。