doc: update ansible.md (#31)
				
					
				
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		@@ -33,28 +33,40 @@ Ansible 备忘清单
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#### 静态Inventory
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`/etc/ansible/hosts`
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```INI
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mail.example.com
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[webservers]
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foo.example.com
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bar.example.com
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```
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Inventory主机组使用多个IP和域名
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 [web]
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### Inventory 主机组使用多个IP和域名
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```
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[web]
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172.18.12.5[1:4]
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[webservers]
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www[01:50].example.com
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```
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Inventory主机组使用子主机组
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### Inventory 主机组使用子主机组
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```ini
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[usa:children]
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southeast
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northeast
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southwest
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northwest
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```
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给多台主机设置变量 : group variables
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### 给多台主机设置变量
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`group variables`
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如果组中的所有主机共享一个变量值,则可以一次将该变量应用于整个组
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```ini
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[atlanta]
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host1
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host2
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