文章目录

一，jinja2二，演示1. 变量中的循环语句2. 使用判断语法推送不同文件3. 使用inventory 方式来生成不同配置文件*4. 使用 jinja方式来生成不同文件(if，变量)

一，jinja2

1.概述

Jinja2 是一个现代的，设计者友好的，模板语言。 它速度快，被广泛使用，并且提供了可选的沙箱模板执行环境保证安全。

当利用jinja2进行渲染的时候，它会把这些特殊的占位符进行填充/替换，jinja2支持python中所有的Python数据类型比如列表、字段、对象等。

2.Ansible 如何使用 jinja2 模板

Ansible 使用 jinja2 模板，也就是 template 模板。该模块和 copy 模块一样，都是将文件复制到目标机器，但是区别在于 template 模块可以获取要复制文件中的变量的值，而 copy 则是原封不动的把文件内容复制过去。

比如：针对不同的主机定义不同的变量，template 会在将文件分发前读取变量到 jinja2 模板，之后再然后分发到不同的被管理主机上。

3.jinja2渲染NginxProxy配置文件用到的语法三种语法

控制结构 {% %} 变量取值 {{ }} 注释 {# #}。

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二，演示

1 变量中的循环语句案例：nginx proxy2 变量中的判断语法案例：keeplive不同主机的配置3 nventory方式实现案例：keeplive不同主机的配置*4. jinja变量方式实现案例：keeplive不同主机的配置

1. 变量中的循环语句

给10台主机装上Nginx服务，但是要求每台主机的端口都不一样，如何解决？

（ jianja配置文件模板，根据不同主机生成不同文件配置nginx proxy）

主机清单：

[root@manager ansible_roles]# cat proxy_blog.oldxu.com.conf.j2

upstream {{ blog_site }} { {% for host in groups['webservers'] %} server {{ host }}; {% endfor %} server { listen 80; server_name {{ blog_site }}; location / { proxy_pass http://{{ blog_site }}; include proxy_params; } }

playbook — 将nginx.conf文件批量拷到对端 [root@manager ansible_roles]# cat nginx_proxy.yml

- hosts: webservers vars: - blog_site: blog.oldxu.com tasks: - name: Configure Nginx Proxy Vurtual File template: src: ./proxy_blog.oldxu.com.conf.j2 dest: /tmp/proxy_blog.oldxu.com.conf

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2. 使用判断语法推送不同文件

常规写法：首先需要写好两个不同配置的文件，再判断不同主机推送不同配置（太笨重） [root@manager ansible_roles]# cat keepalived.yml #keepalive的安装，配置，启动

- hosts: lbservers tasks: - name: Install Keepalived Server yum: name: keepalived state: present - name: Configure Keepalived Server copy: src: ./keepalived-master.conf.j2 dest: /etc/keepalived/keepalived.conf when: ( ansible_hostname == "lb01" ) notify: Restart Keepalived Server - name: Configure Keepalived Server copy: src: ./keepalived-backup.conf.j2 dest: /etc/keepalived/keepalived.conf when: ( ansible_hostname == "lb02" ) notify: Restart Keepalived Server - name: Started Keepalived Server systemd: name: keepalived state: started enabled: yes handlers: - name: Restart Keepalived Server systemd: name: keepalived state: restarted

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3. 使用inventory 方式来生成不同配置文件

主机清单 　　　　　#预先定义好变量

hosts: [lbservers] 172.16.1.5 state=MASTER priority=150 172.16.1.6 state=BACKUP priority=120

[root@manager ansible_roles]# cat keepalived-template.conf.j2 #keepalvie配置文件

global_defs { router_id {{ ansible_hostname }} } vrrp_instance VI_1 { state {{ state }} priority {{ priority }} interface eth0 virtual_router_id 50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.3 } }

[root@manager ansible_roles]# cat keepalived.yml 　#keepalive的安装，配置，启动

- hosts: lbservers tasks: - name: Install Keepalived Server yum: name: keepalived state: present - name: Configure Keepalived Server template: src: keepalived-template.conf.j2 dest: /etc/keepalived/keepalived.conf notify: Restart Keepalived Server - name: Started Keepalived Server systemd: name: keepalived state: started enabled: yes handlers: - name: Restart Keepalived Server systemd: name: keepalived state: restarted

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*4. 使用 jinja方式来生成不同文件(if，变量)

主机清单 [root@manager ansible_roles]# cat hosts

[lbservers] 172.16.1.5 172.16.1.6

[root@manager ansible_roles]# cat keepalived-template.conf.j2　＃keepalive配置的 jinja2文件

global_defs { router_id {{ ansible_hostname }} } vrrp_instance VI_1 { {% if ansible_hostname == "lb01" %} state MASTER priority 200 {% elif ansible_hostname == "lb02" %} 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 } }

[root@manager ansible_roles]# cat keepalived.yml #keepalive的安装，配置，启动

- hosts: lbservers tasks: - name: Install Keepalived Server yum: name: keepalived state: present - name: Configure Keepalived Server template: src: keepalived-template.conf.j2 dest: /etc/keepalived/keepalived.conf notify: Restart Keepalived Server - name: Started Keepalived Server systemd: name: keepalived state: started enabled: yes handlers: - name: Restart Keepalived Server systemd: name: keepalived state: restarted

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