Ansible：安装包后无法启动httpd服务

Question

我正在测试剧本

以下 playbook 可以安装 apache 并启动服务：

- hosts: apacheweb
  user: ansibleuser
  become: yes
  gather_facts: no
  tasks:
  - name: Install the apache web server
    yum: pkg=httpd state=latest
    notify: Start HTTPD
  handlers:
  - name: Start HTTPD
    systemd: name=httpd state=started enabled=yes

但不是下一个，因为它确实安装了 httpd 包，但没有启动服务并启用它。

- hosts: apacheweb
  user: ansibleuser
  become: yes
  gather_facts: no
  tasks:
  - name: Install the apache web server
    yum: pkg=httpd state=latest
    notify: Start HTTPD
  - name: verify that the web service is running
    command: systemctl status httpd
    register: result
  - debug: var=result
  handlers:
  - name: Start HTTPD
    systemd: name=httpd state=started enabled=yes

错误输出：

PLAY [apacheweb] ******************************************************************************************************************

TASK [Install the apache web server] **********************************************************************************************
changed: [host.learn.com]

TASK [verify that the web service is running] *************************************************************************************
fatal: [host.learn.com]: FAILED! => {"changed": true, "cmd": ["systemctl", "status", "httpd"], "delta": "0:00:00.032030", "end": "2020-04-14 17:59:18.295428", "msg": "non-zero return code", "rc": 3, "start": "2020-04-14 17:59:18.263398", "stderr": "", "stderr_lines": [], "stdout": "● httpd.service - The Apache HTTP Server\n   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)\n   Active: inactive (dead)\n     Docs: man:httpd(8)\n           man:apachectl(8)\n\nApr 14 14:50:31 host.learn.com systemd[1]: Starting The Apache HTTP Server...\nApr 14 14:50:31 host.learn.com systemd[1]: Started The Apache HTTP Server.\nApr 14 14:53:45 host.learn.com systemd[1]: Stopping The Apache HTTP Server...\nApr 14 14:53:46 host.learn.com systemd[1]: Stopped The Apache HTTP Server.\nApr 14 17:56:51 host.learn.com systemd[1]: Starting The Apache HTTP Server...\nApr 14 17:56:51 host.learn.com systemd[1]: Started The Apache HTTP Server.\nApr 14 17:57:32 host.learn.com systemd[1]: Stopping The Apache HTTP Server...\nApr 14 17:57:33 host.learn.com systemd[1]: Stopped The Apache HTTP Server.", "stdout_lines": ["● httpd.service - The Apache HTTP Server", "   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)", "   Active: inactive (dead)", "     Docs: man:httpd(8)", "           man:apachectl(8)", "", "Apr 14 14:50:31 host.learn.com systemd[1]: Starting The Apache HTTP Server...", "Apr 14 14:50:31 host.learn.com systemd[1]: Started The Apache HTTP Server.", "Apr 14 14:53:45 host.learn.com systemd[1]: Stopping The Apache HTTP Server...", "Apr 14 14:53:46 host.learn.com systemd[1]: Stopped The Apache HTTP Server.", "Apr 14 17:56:51 host.learn.com systemd[1]: Starting The Apache HTTP Server...", "Apr 14 17:56:51 host.learn.com systemd[1]: Started The Apache HTTP Server.", "Apr 14 17:57:32 host.learn.com systemd[1]: Stopping The Apache HTTP Server...", "Apr 14 17:57:33 host.learn.com systemd[1]: Stopped The Apache HTTP Server."]}

RUNNING HANDLER [Start HTTPD] *****************************************************************************************************

PLAY RECAP ************************************************************************************************************************
host.learn.com : ok=1    changed=1    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0

我创建的第二个剧本可能有什么问题？

Answer 1

启动服务的处理程序 Start HTTPD 没有运行因为任务 verify that the web service is running 失败。

On each host, Handlers are run only once after all the tasks in a play are complete.

在您的剧本中，有三个任务。尽管第一个任务 Install the apache web server 通知了处理程序，但只有在完成该游戏中的所有三个任务后，ansible 运行才会通知处理程序。

When a task fails on a host, handlers which were previously notified will not be run on that host.

并且第二个任务的失败停止了该主机上运行ning 的处理程序，因此服务没有启动。

如果你想运行处理程序而不考虑任务失败，你可以在你的游戏中设置force_handlers: True。

阅读更多：Handlers, Handler Failures

Ansible：安装包后无法启动httpd服务

Ansible: Unable to start the httpd service after installing its package

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