基本設定

1. ansible-core 套件中 /etc/ansible/hosts 是一個 inventory 範例檔。
   範例說明：

   ceuser@deyu:$ cat /etc/ansible/hosts 
   # This is the default ansible 'hosts' file.
   #
   # It should live in /etc/ansible/hosts
   #
   #   - Comments begin with the '#' character  # 并號開頭為註解
   #   - Blank lines are ignored  # 空白行忽略
   #   - Groups of hosts are delimited by [header] elements # 群組以 [...] 區隔
   #   - You can enter hostnames or ip addresses  # 可以使用主機名稱或IP位址
   #   - A hostname/ip can be a member of multiple groups # 主機名稱/ip 可以是多個
   

2. 範例一：不屬於群組的主機。

   # Ex 1: Ungrouped hosts, specify before any group headers:
   
   ## green.example.com
   ## blue.example.com
   ## 192.168.100.1
   ## 192.168.100.10
   

3. 範例二：屬於 webservers 群組的主機。

   # Ex 2: A collection of hosts belonging to the 'webservers' group:
   
   ## [webservers]
   ## alpha.example.org
   ## beta.example.org
   ## 192.168.1.100
   ## 192.168.1.110
   

4. 使用 pattern 指定多台主機，以下範例是 www1.example.com 至 www6.example.com 6 台主機，db-99-node.example.com 至 db-101-node.example.com 三台主機。

   # If you have multiple hosts following a pattern, you can specify
   # them like this:
   
   ## www[001:006].example.com
   
   # You can also use ranges for multiple hosts:
   
   ## db-[99:101]-node.example.com
   

5. 範例三：屬於 dbservers 群組的主機。

   # Ex 3: A collection of database servers in the 'dbservers' group:
   
   ## [dbservers]
   ##
   ## db01.intranet.mydomain.net
   ## db02.intranet.mydomain.net
   ## 10.25.1.56
   ## 10.25.1.57
   

6. 多台主機被分組，例如：“Debian” 和 “openSUSE”。

   # Ex4: Multiple hosts arranged into groups such as 'Debian' and 'openSUSE':
   
   ## [Debian]
   ## alpha.example.org
   ## beta.example.org
   
   ## [openSUSE]
   ## green.example.com
   ## blue.example.com