*无法联网的明显表现会有：
1、yum install出现 Error: cannot find a valid baseurl or repo:base
2、ping host会提示unknown host
解决方案
1、打开 vi /etc/sysconfig/network-scripts/ifcfg-ens33
（每个机子都可能不一样，具体请使用ifconfig命令查看自己的网卡名），
把ONBOOT=no，改为ONBOOT=yes
2、重启网络：service network restart
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