1.jinja2渲染NginxProxy配置文件

• jinja2

  • 房屋建筑设计固定的?

• jinja2模板与Ansible关系

• Ansible如何使用jinja2模板

  • template模块 拷贝文件?
  • template copy 区别?
    • template会解析配置文件中的变量
    • copy 不会解析任何的变量,只会拷贝文件

Ansible允许jinja2模板中使用判断 循环，但是jinja判断循环语法不允许在playbook中使用。

注意: 不是每个管理员都需要这个特性，但是有些时候jinja2模板能大大提高效率。

1.jinja模板基本语法1)要想在配置文件中使用jinj2，playbook中的tasks 必须使用template模块

2)模板配置文件里面使用变量，比如 {{ PORT }} 或使用 {{ facts 变量 }}

2.jinja模板逻辑关系{% for i in EXPR %}...{% endfor%} 作为循环表达式

{% if EXPR %}...{% elif EXPR %}...{% endif%} 作为条件判断

{# COMMENT #} 表示注释

{% for i in range(1,10)%}server 172.16.1.{{i}};
{% endfor %}#判断
{% if ansible_fqdn == "web01" %}echo 123
{% elif ansible_fqdn == "web02" %}echo 456
{% else %}echo 789
{% endif %}

nginxproxy配置文件

[root@manager jinja2]# cat j_nginx.yml
- hosts: lbserverstasks:#安装nginx- name: Installed nginx Serveryum: name: nginxstate: present#配置nginx vhosts- name: Configure nginx Servertemplate:src: ./file/proxy_kod.oldxu.com.conf.j2dest: /etc/nginx/conf.d/proxy_kod.oldxu.com.confnotify: Restart Nginx Server#启动Nginx- name: Systemd Nginx Serversystemd:name: nginxstate: startedenabled: yes handlers:- name: Restart Nginx Serversystemd: name: nginxstate: restarted# nginx组变量
[root@manager jinja2]# cat group_vars/all
kod_http_port: 80
kod_server_name: kod.oldxu.com
kod_web_site: /code/kod#nginx proxy配置文件渲染
[root@manager jinja2]# cat file/proxy_kod.oldxu.com.conf.j2
upstream {{ kod_server_name }} {{% for host in groups['webservers'] %}server {{host}}:{{kod_http_port}};{% endfor %}
}server {listen {{ kod_http_port }};server_name  {{ kod_server_name }};location / {proxy_pass http://{{ kod_server_name }};proxy_set_header Host $http_hosts;}
}[root@manager jinja2]# cat ../hosts
[webservers]
172.16.1.7
172.16.1.8

2.Keepalived配置文件 master slave

​ 1.准备多个配置文件 master backup

[root@manager jinja2]# cat j_keepalived.yml
- hosts: lbserverstasks:- name: Installed Keepalived Serveryum:name: keepalivedstate: present- name: Configure Keepalived Mastercopy:src: ./file/keepalived-master.conf.j2dest: /etc/keepalived/keepalived.confwhen: ( ansible_hostname == "lb01" )notify: Restart Keepalived Server- name: Configure Keepalived Backupcopy:src: ./file/keepalived-backup.conf.j2dest: /etc/keepalived/keepalived.confwhen: ( ansible_hostname == "lb02" )notify: Restart Keepalived Server- name: Systemd Keepalived Serversystemd:name: keepalivedstate: startedenabled: yeshandlers:- name: Restart Keepalived Serversystemd:name: keepalivedstate: restarted

​ 2.设定host_vars变量 5和6设定相同的变量,不同的值

#1.准备一份keepalived配置文件
#2.需要在keepalived配置文件中使用变量方式  ---> jinja[root@manager jinja2]# cat ./file/keepalived-vars.conf.j2
global_defs {     router_id {{ ansible_hostname }}
}vrrp_instance VI_1 {state  {{ state }}priority {{ priority }}interface eth0virtual_router_id 50advert_int 1authentication {auth_type PASSauth_pass 1111
}virtual_ipaddress {10.0.0.3}
}[root@manager jinja2]# cat host_vars/172.16.1.5
state: MASTER
priority: 200
[root@manager jinja2]# cat host_vars/172.16.1.6
state: BACKUP
priority: 99[root@manager jinja2]# cat var_keepalived.yml
- hosts: lbserverstasks:- name: Installed Keepalived Serveryum:name: keepalivedstate: present- name: Configure Keepalived Mastertemplate:src: ./file/keepalived-vars.conf.j2dest: /etc/keepalived/keepalived.confnotify: Restart Keepalived Server- name: Systemd Keepalived Serversystemd:name: keepalivedstate: startedenabled: yeshandlers:- name: Restart Keepalived Serversystemd:name: keepalivedstate: restarted#为不同的主机设定相同的变量,  只不过值不一样.

3.jinja2判断方式

[root@manager jinja2]# cat jinja_keepalived.yml
- hosts: lbserverstasks:- name: Installed Keepalived Serveryum:name: keepalivedstate: present- name: Configure Keepalived Mastertemplate:src: ./file/keepalived.conf.j2dest: /etc/keepalived/keepalived.confnotify: Restart Keepalived Server- name: Systemd Keepalived Serversystemd:name: keepalivedstate: startedenabled: yeshandlers:- name: Restart Keepalived Serversystemd:name: keepalivedstate: restarted[root@manager jinja2]# cat file/keepalived.conf.j2
global_defs {     router_id {{ ansible_hostname }}
}vrrp_instance VI_1 {
{% if ansible_hostname == "lb01" %}state  MASTERpriority 150
{% elif ansible_hostname == "lb02" %}state  BACKUPpriority 100
{% endif %}
#########################相同的内容interface eth0virtual_router_id 50advert_int 1authentication {auth_type PASSauth_pass 1111
}virtual_ipaddress {10.0.0.3}
}