Fix some vm cannot fetch ip of domain.

README.md

@@ -118,8 +118,14 @@ $ sudo apt update && apt-cache policy libssl1.0-dev
 $ sudo apt-get install libssl1.0-dev
 ```
 
-
-
+## 設定host IP(避免VM抓不到domain對應的IP)
+```sh
+# sudo vim /etc/hosts 加入以下內容
+59.120.142.210 gitlab.tp.rulingcom.com
+59.120.142.206 ruling.digital store.tp.rulingcom.com
+151.101.1.227 index.rubygems.org rubygems.org
+104.192.141.1 bitbucket.org
+```
 ## 安裝 RVM (Ruby 版本和套件的管理程式)
 
 ```sh