案例：获取所有主机基础信息

一、背景

项目需求：需要获取以下主机信息
主机名称、内核版本、IP地址、网关

二、操作步骤

#创建role，get-host

ansible-galaxy init role/get-host

#编辑roles/get-host/templates/Host_info.j2

{% for host in groups['node'] %}
设备名称：{{ hostvars[host].ansible_hostname }}
内核版本：{{ hostvars[host].ansible_kernel }}
IP地址：{{ hostvars[host].ansible_ens192.ipv4.address }}
网关： {{ hostvars[host].ansible_default_ipv4.gateway }}
{% endfor %}

#编辑roles/get-host/tasks/main.yml

---
# tasks file for roles/get-host
  - name: ceshi
    template:
      src: Host_info.j2
      dest: /tmp/Host_info

#编辑Host_info.yaml

---
- name: Get all controlled hostnames
  hosts: node
  roles:
    - get-host

#ansible-playbook运行Host_info.yaml

ansible-playbook --syntax-check Host_info.yaml #检擦yaml格式
ansible-playbook  Host_info.yaml	#执行剧本