wget：无法解析主机地址。这就能看出是DNS解析的问题。
解决办法：
- 登入root（VPS）。
- 进入/etc/resolv.conf。
- 修改内容为下
nameserver 8.8.8.8 #google域名服务器
nameserver 8.8.4.4 #google域名服务器
wget: unable to resolve host address “mirrors.163.com” 的解决办法
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