ansible jinja2模板概述

目錄

• ansible jinja2模板概述
• ansible jinja2模板使用
  • 基本語法
  • jinja2模板邏輯判斷
• ansible jinja2管理nginx
• ansible jinja2管理keepalived
  • keepalived原配
  • 推送keepalived配置文件
  • 準備keepalived配置文件

ansible jinja2模板概述

ansible允許jinja2模板中使用條件判斷和迴圈，但是不允許在playbook中使用

ansible jinja2模板使用

基本語法

{{ EXPR }}輸出變數值，會輸出自定義的變數值或facts
1)playbook文件使用template模塊
2)模板文件裡面變數使用{{名稱}}，比如{{PORT}}或使用facts

jinja2模板邏輯判斷

#迴圈表達式
{% for i in EXPR %}
{% endfor %}

#條件判斷
{% if EXPR %}
{% elif EXPR %}
{% else %}
{% ednif %}

#註釋
{# COMMENT #}

jinja2示例

• 編輯playbook

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

• 準備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

• 執行playbook

ansible jinja2管理nginx

使用playbook推送文件

1.編輯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.準備配置文件

[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

準備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
    }
}