playbook详解—YAML格式的文本

在playbook中有一些核心的指令

hosts：指明命令运行在哪个node之上 
remote_user：在远端的node之上以什么用户的身份运行命令 
var：给模板传递变量值 
tasks：指明需要执行的命令 
template：指明模板文件 
handler：指明句柄所在文件目录名 
Roles：指明需要运行的角色名

（一）检查playbook是否正确

ansible-playbook --syntax-check first.yml

（二）预执行playbook

ansible-playbook --check first.yml

（三）查看执行命令的node节点的IP地址或主机名

ansible-playbook --list-hosts first.yml

first.yml

 

- hosts: webservers

remote_user: root

tasks:

- name: install httpd

yum: name=httpd state=latest

- name: distribute config file

copy: src=config/httpd.conf dest=/etc/httpd/conf/httpd.conf

tags: redistibute

notify: restart httpd

- name: start httpd

service: name=httpd state=started enabled=yes

- name: check httpd started

shell: netstat -lntup | grep 80

 

 

handlers:

- name: restart httpd

service: name=httpd state=restarted enabled=yes

（四）使用vars定义变量

- hosts: dbservers

remote_user: root

vars:

- username: home

- groupname: uplooking

tasks:

- name: add group

group: name={{ groupname }}

- name: add user

user: name={{ username }} state=present