使用Python字典编写Ansible剧本 [英] Write Ansible playbooks using Python dictionary

问题描述

我正在尝试使用python脚本执行以下剧本.

I am trying execute the following playbook using python script.

playbook = dict(
        name = "Enable Site",
        hosts = [host],
        gather_facts = 'no',
        tasks = [
            dict(action=dict(
                module='find', args=dict(paths="/etc/apache2/sites-enabled")), register='files_found'),
            dict(action=dict(
                module='shell', args="cd /etc/apache2/sites-enabled && a2dissite *"), register='shell_out', when='files_found.matched > 0'),
            dict(action=dict(module='shell', args="a2ensite " + site_name), register='shell_out'),
            dict(action=dict(module='service', args="name='apache2' state='reloaded'"), register='shell_out'),
        ]
    )

这本剧本基本上会检查是否启用了任何apache站点，然后通过从/etc/apache2/sites-enabled中删除所有文件来禁用它们.

This playbook basically checks if any apache site is enabled if yes then it disables them by removing all the files from /etc/apache2/sites-enabled.

第二个任务应该在目录/etc/apache2/sites-enabled为空时执行.但是条件总是在何时"被评估为真.即使我写when="False".还尝试了when="eval(False)"

The second task is supposed to be executed when the directory /etc/apache2/sites-enabled is empty. But the "when" the condition is always evaluated to be true. Even if I write when="False". Also tried when="eval(False)"

推荐答案

如果我将您的playbook词典转换为常规的Ansible剧本，就像这样:

If I convert your playbook dictionary to a regular Ansible playbook, like this:

- name: Enable Site
  hosts:
    - localhost
  gather_facts: no
  tasks:
    - action:
        module: find
        args:
          paths: /etc/apache2/sites-enabled
      register: files_found
    - action:
        module: shell
        args: cd /etc/apache2/sites-enabled && a2dissite *
      register: shell_out
      when: files_found.matched > 0
    - action:
        module: shell
        args: a2ensite 100-mysite.conf
      register: shell_out
    - action:
        module: service
        args: name='apache2' state='reloaded'
      register: shell_out

它似乎按预期运行.也就是说，如果我从一个空的/etc/apache2/sites-enabled目录开始，我会看到:

It seems to run as intended. That is, if I start with an empty /etc/apache2/sites-enabled directory, I see:

PLAY [Enable Site] *******************************************************************

TASK [find] **************************************************************************
ok: [localhost]

TASK [shell] *************************************************************************
skipping: [localhost]

TASK [shell] *************************************************************************
changed: [localhost]

您可以看到它正在跳过第二个Shell任务.但是，请考虑一下您的剧本会做什么:

You can see it's skipping the second shell task there. However, think about what your playbook does:

• 它检查目录是否为空
• 如果不是，它将禁用所有功能
• 它将文件安装到目录中

这意味着每次运行此剧本，它都会清空/etc/apache2/sites-enabled，然后重新启用以site_name变量命名的站点.

That means every time you run this playbook, it's going to empty out /etc/apache2/sites-enabled, and then re-enable the site named in your site_name variable.

这篇关于使用Python字典编写Ansible剧本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！