ansible playbook lookups组件

1.lookups file
支持从外部数据拉取信息，例如从数据库里拉取信息，而后定义给一个变量的形式

• hosts: all
  gather_facts: true
  vars:
  contents: "{{ lookup('file', '/etc/sysconfig/network') }}"
  tasks:
  • name: debug lookups
    debug: msg="The contents is {% for i in contents.split("\n") %} {{ i }} {% endfor %}"
    结果：
    PLAY [all] ****

TASK [Gathering Facts] ****
ok: [192.168.1.1]

TASK [debug lookups] **
**ok: [192.168.1.1] => {
"msg": "The contents is # Created by anaconda NETWORKING_IPV6=no PEERNTP=no "
}

PLAY RECAP *
192.168.1.1 : ok=2 changed=0 unreachable=0 failed=0 **

2.lookups password对传入的内容进行加密处理

• hosts: all
  gather_facts: False
  vars:
  contents: "{{ lookup('password', 'ansible_book') }}"
  tasks:
  • name: debug lookups
    debug: msg="The contents is {{ contents }}"

3.lookups pipe
pipe lookups控制机上调用subprocess.Popen执行命令，而后将命令的结果传递给变量

• hosts: all
  gather_facts: False
  vars:
  contents: "{{ lookup('pipe', 'date +%Y-%m-%d') }}"
  tasks:
  • name: debug lookups
    debug: msg="The contents is {% for i in contents.split("\n") %} {{ i }} {% endfor %}"
    结果：
    TASK [debug lookups]
    ok: [47.100.16.187] => {
    "msg": "The contents is 2018-02-03 "
    }

4.lookups redis_kv
redis_kv就是从redis数据库中get数据，须要安装redis python库:yum install python-redis

5.lookups template
读取文件template.j2,里面定义的变量是每台主机的fatcs信息
worker_processes {{ ansible_processor_cores }};
IPaddress {{ ansible_eth0.ipv4.address }}