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，然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 ****
TASK ****
ok:
TASK **
**ok: => {
"msg": "The contents is# Created by anacondaNETWORKING_IPV6=noPEERNTP=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，然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
ok: => {
"msg": "The contents is2018-02-03 "
}
4.lookups redis_kv
redis_kv就是从redis数据库中get数据，需要安装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 }}
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