如何有条件地在ansible上执行任务组?

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我想有条件地执行一组任务.

I want to conditionally execute a set of tasks. Is there any syntax available that would let me execute a group of tasks, where the condition is evaluated once per whole group (like in a if statement in programming languages)?

看看下面的代码片段.我知道差异很小，但是第一个代码更好地表达了我的意图，而不会用其他变量(user_home_result2)污染名称空间.

Take a look at the code snippets below. I know the difference is small, but the first code better expresses my intention without polluting the namespace with additional variables (user_home_result2).

- name: Capturing user's home directory shell: "getent passwd {{ user }} | awk -F: '{ print $6 }'" register: user_home_result - set_fact: user_home={{ user_home_result.stdout }} - when: user_home != '' - name: Setting up user {{ user }} user: > generate_ssh_key=yes name="{{ user }}" - name: Capturing user's home directory shell: "getent passwd {{ user }} | awk -F: '{ print $6 }'" register: user_home_result - set_fact: user_home={{ user_home_result.stdout }}

解决方法:

- name: Capturing user's home directory shell: "getent passwd {{ user }} | awk -F: '{ print $6 }'" register: user_home_result - set_fact: user_home={{ user_home_result.stdout }} - name: Setting up user {{ user }} user: > generate_ssh_key=yes name="{{ user }}" when: user_home != '' - name: Capturing user's home directory shell: "getent passwd {{ user }} | awk -F: '{ print $6 }'" register: user_home_result2 when: user_home != '' - set_fact: user_home={{ user_home_result2.stdout }} when: user_home != ''

推荐答案

您可以将任务放入新的yml文件中，并使用条件包含:

You can put the tasks in a new yml file and use a conditional include:

# subtasks.yml --- - name: Setting up user {{ user }} user: > generate_ssh_key=yes name="{{ user }}" - name: Capturing user's home directory shell: "getent passwd {{ user }} | awk -F: '{ print $6 }'" register: user_home_result - set_fact: user_home={{ user_home_result.stdout }}

在剧本中:

- name: Capturing user's home directory shell: "getent passwd {{ user }} | awk -F: '{ print $6 }'" register: user_home_result - set_fact: user_home={{ user_home_result.stdout }} - include: subtask.yml when: user_home != ''