ansible jinja2模板概述

目录

ansible jinja2模板概述

ansible允许jinja2模板中使用条件判断和循环，但是不允许在playbook中使用

ansible jinja2模板使用

基本语法

{{ expr }}输出变量值，会输出自定义的变量值或facts
1)playbook文件使用template模块
2)模板文件里面变量使用{{名称}}，比如{{port}}或使用facts

jinja2模板逻辑判断

#循环表达式
{% for i in expr %}
{% endfor %}

#条件判断
{% if expr %}
{% elif expr %}
{% else %}
{% ednif %}

#注释
{# comment #}

jinja2示例

• 编辑playbook

[root@m01 ~]# vim jinja2.yml
- hosts: web_group
  tasks:
    - name: copy template file
      template:
        src: ./motd.j2
        dest: /etc/motd

• 准备motd.j2

[root@m01 ~]# vim motd.j2
welcome to {{ ansible_fqdn }}
this system total mem is : {{ ansible_memtotal_mb }} mb
this system free mem is: {{ ansible_memfree_mb }} mb

• 执行playbook

ansible jinja2管理nginx

使用playbook推送文件

1.编辑playbook

[root@m01 ~]# vim lb.yml
- hosts: lb_group
  vars:
    http_port: 80
    server_name: www.drz.com
  tasks:
    - name: copy
      template:
        src: ./www.drz.com.conf.j2
        dest: /etc/nginx/conf.d/www.drz.com.conf
      notify: reload nginx
  handlers:
    - name: reload nginx
      systemd:
        name: nginx
        state: reloaded

2.准备配置文件

[root@m01 ~]# vim lb.yml
- hosts: lb_group
  vars:
    http_port: 80
    server_name: www.drz.com
  tasks:
    - name: copy
      template:
        src: ./www.drz.com.conf.j2
        dest: /etc/nginx/conf.d/www.drz.com.conf
      notify: reload nginx
  handlers:
    - name: reload nginx
      systemd:
        name: nginx
        state: reloaded

ansible jinja2管理keepalived

keepalived原配

#keepalived master 配置文件
global_defs {
    router_id lb01
}

vrrp_instance vi_1 {
    state master
    interface eth0
    virtual_router_id 50
    priority 150
    advert_int 1
    authentication {
        auth_type pass
        auth_pass 1111
    }
    virtual_ipaddress {         
        10.0.0.3
    }
}


#keepalived backup配置文件
global_defs {
    router_id lb02
}

vrrp_instance vi_1 {
    state backup        
    interface eth0
    virtual_router_id 50
    priority 100
    advert_int 1
    authentication {    
        auth_type pass
        auth_pass 1111
    }
    virtual_ipaddress {
        10.0.0.3
    }
}

推送keepalived配置文件

[root@m01 ~]# vim keepalived.yml
- hosts: lb_group
  tasks:
    - name: copy file
      template:
        src: ./keepalived.j2
        dest: /etc/keepalived/keepalived.conf
      notify: restart keepalived

  handlers:
    - name: restart keepalived
      systemd:
        name: keepalived
        state: restarted

准备keepalived配置文件

[root@m01 ~]# vim keepalived.j2
global_defs {
    router_id {{ ansible_fqdn }}
}

vrrp_instance vi_1 {
{% if ansible_fqdn == "lb01" %}
    state master
    priority 150
{% else %}
    state backup
    priority 100
{% endif %}

    interface eth0
    virtual_router_id 50
    advert_int 1
    authentication {
        auth_type pass
        auth_pass 1111
    }
    virtual_ipaddress {         
        10.0.0.3
    }
}