ansible playbook使用jinja2语法渲染inventory下的主机名和IP到/etc/hosts

1. ansible inventory 下面的 hosts内容如下：

[all_host]
app1 ansible_host=10.2.162.147 
app2 ansible_host=10.2.162.148
app3 ansible_host=10.2.162.149
app4 ansible_host=10.2.162.150
app5 ansible_host=10.2.162.151

[nginx]
app1

2. hosts.j2内容如下

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

{% for host in groups.all_host %}
{{ hostvars[host]['ansible_host'] }} {{ hostvars[host]['inventory_hostname'] }}
{% endfor %}

3. 渲染结果：

cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

10.2.162.147 app1
10.2.162.148 app2
10.2.162.149 app3
10.2.162.150 app4
10.2.162.151 app5