抽出变量和变量文件

4.4节中提到的repo地址和apache主目录路径其实也可以作为参数提出来(其实同时也把sudo:yes提出来作为了公共属性):

---
- hosts: static_page
  become_method: sudo
  become: yes

  vars:
    packages:
      - git
      - apache2
    repo_url: https://github.com/Yaowenjie/static_page.git
    dest_dir: /var/www/html/static_page

  tasks:
    - name: Apt update
      run_once: true
      apt:
        update_cache: yes

    - name: Ensure packages installed
      apt:
        name: "{{ item }}"
        state: present
      with_items: "{{ packages }}"

    - name: Git clone remote static page repo
      git:
        repo={{ repo_url }}
        dest={{ dest_dir }}
        update=yes

实际情况下，我们可能还会遇到很多需要抽出来的变量，很多时候，把变量从主要文件内抽出来单独管理也是很有必要的，本例中我们将它抽成一个名为variables.yml：

---
packages:
  - git
  - apache2
repo_url: https://github.com/Yaowenjie/static_page.git
dest_dir: /var/www/html/static_page

同时，需要在setupstaticpage.yml中使用__vars_files引用该变量文件:

---
- hosts: static_page
  vars_files:
    - "variables.yml"

  tasks:
    - name: Apt update
      sudo: yes
      apt:
        update_cache: yes

    - name: Ensure packages installed
      sudo: yes
      apt:
        name: "{{ item }}"
        state: present
      with_items: "{{ packages }}"

    - name: Git clone remote static page repo
      sudo: yes
      git:
        repo={{ repo_url }}
        dest={{ dest_dir }}
        update=yes

同样的，记得每次改变后重新执行ansible-playbook。