四、ansible的templates

4、ansible的templates

jinja2模板：该模板文件里面可以包含普通字符串，也可以使用变量，部署该文件时需要使用template模块，文件里面的变量会对应转换成变量所对应的值。

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https://jinja.palletsprojects.com/en/3.1.x/ #官方文档
http://docs.jinkan.org/docs/jinja2/ #中文文档

jinjia2中的条件判断：

bash 复制代码

#写法1
{% if EXPR %}
...
{% endif %}

#写法2
{% if EXPR %}
...
{% else %}
...
{% endif %}
#写法3
{% if EXPR %}
...
{% elif EXPR %}
...
{% else %}
...
{% endif %}

jinjia2中的for循环：

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{% for i in EXPR %}
...
{% endfor %}

示例1：

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[devops@master chap03]$ cat test1.j2
{{ username }}
{{ ansible_facts.default_ipv4.address }}
[devops@master chap03]$ cat template.yml
---
- name: test template
  hosts: master
  vars:
    - username: test1
  tasks:
    - name: test template
      template:
        src: ./test1.j2
        dest: /tmp/test1.txt
[devops@master chap03]$ ansible-playbook  template.yml
[devops@master chap03]$ cat /tmp/test1.txt
test1
192.168.168.10

示例2：

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[devops@master chap03]$ cat test2.j2
{% if var1 != 'hello' %}
var1 is hi
{% endif %}

{% if var2 > 3 %}
var2 > 3
{% elif var2 == 3 %}
var2 == 3
{% else %}
var2 < 3
{% endif %}

{% for i in range(1,4) %}
{{ i }}  {{ i+10 }}
{% endfor %}

{% for i in var3 %}
{{ i.ip }} : {{ i.port }}
{% endfor %}
[devops@master chap03]$ cat template2.yml
---
- name: test template
  hosts: master
  vars:
    var1: hi
    var2: 4
    var3:
      - ip: 192.168.168.10
        port: 22
      - ip: 192.168.168.21
        port: 80
  tasks:
    - template:
        src: ./test2.j2
        dest: /tmp/template.yml
[devops@master chap03]$ ansible-playbook  template2.yml
[devops@master chap03]$ cat  /tmp/template.yml
var1 is hi

var2 > 3

1  11
2  12
3  13

192.168.168.10 : 22
192.168.168.21 : 80

示例3：

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[devops@master chap03]$ cat hosts.j2
{% for host in groups.all %}
{{ hostvars[host]['ansible_facts']['fqdn'] }} {{ hostvars[host]['ansible_facts']['default_ipv4']['address'] }}
{% endfor %}
[devops@master chap03]$ cat hosts.yml
---
- name: test template hosts
  hosts: all
  tasks:
    - name: template hosts
      template:
        src: ./hosts.j2
        dest: /tmp/hosts
[devops@master chap03]$ ansible-playbook  hosts.yml
[devops@master chap03]$ ansible all -a 'cat /tmp/hosts'
master | CHANGED | rc=0 >>
node02 192.168.168.22
master 192.168.168.10
node01 192.168.168.21
node02 | CHANGED | rc=0 >>
node02 192.168.168.22
master 192.168.168.10
node01 192.168.168.21
node01 | CHANGED | rc=0 >>
node02 192.168.168.22
master 192.168.168.10
node01 192.168.168.21