A-Playbook-template

template功能：根据模块文件动态生成对应的配置文件

template文件必须存放于templates目录下，且命名为 .j2 结尾

yaml/yml 文件需和templates目录平级，目录结构如下

./
├── temnginx.yml
└── templates
└── nginx.conf.j2

示例：利用template 同步nginx配置文件

准备templates/nginx.conf.j2文件

vim temnginx.yml
- hosts: websrvs
  remote_user: root
 tasks:
 - name: template config to remote hosts
   template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf

Playbook中template变更替换

修改文件nginx.conf.j2 下面行为

worker_processes {{ ansible_processor_vcpus }};  

Playbook中template算术运算

worker_processes {{ ansible_processor_vcpus**2 }};
worker_processes {{ ansible_processor_vcpus+2 }};

迭代： with_items

迭代：当有需要重复性执行的任务时，可以使用迭代机制 对迭代项的引用，固定变量名为” item“ 要在task中使用with_items给定要迭代的元素列表 列表格式： 字符串 字典

- name: add several users
  user: name={{ item }} state=present groups=wheel
  with_items:
  - testuser1
  - testuser2

上面语句的功能等同于下面的语句

- name: add user testuser1
  user: name=testuser1 state=present groups=wheel
- name: add user testuser2
  user: name=testuser2 state=present groups=wheel  

将多个文件进行copy到被控端

---
- hosts: testsrv
  remote_user: root
  tasks
  - name: Create rsyncd config
    copy: src={{ item }} dest=/etc/{{ item }}
    with_items:
    - rsyncd.secrets
    - rsyncd.conf

- hosts: websrvs
  remote_user: root
  tasks:
  - name: copy file
  copy: src={{ item }} dest=/tmp/{{ item }}
  with_items:
  - file1
  - file2
  - file3
  - name: yum install httpd
    yum: name={{ item }} state=present
    ith_items:
    - apr
    - apr-util
    - httpd

- hosts： websrvs
  remote_user: root
  tasks：
  - name: install some packages
  yum: name={{ item }} state=present
  with_items:
  - nginx
  - memcached
  - php-fpm

迭代嵌套子变量

- hosts： websrvs
  remote_user: root
  tasks:
  - name: add some groups
    group: name={{ item }} state=present
    with_items:
    - group1
    - group2
    - group3
  - name: add some users
    user: name={{ item.name }} group={{ item.group }} state=present
    with_items:
    - { name: 'user1', group: 'group1' }
    - { name: 'user2', group: 'group2' }
    - { name: 'user3', group: 'group3' }