What to do if CentOS7 cannot connect to the network
Step one: Modify the configuration file
Use vi editor to modify /etc/sysconfig/network-scripts/ifcfg-eth0
Enter the /etc/sysconfig/network-scripts directory (recommended learning: MySQL video tutorial)
cd /etc/sysconfig/network-scripts # 打开配置文件 vi ifcfg-ens33 # 这里可能你的文件名不是这个，但是找前面是 ifcfg-ens 的就是了
Change ONBOOT=no in the file to ONBOOT=yes, then save and exit (don’t forget to save!!)
Step 2: Restart the network service
After the modification is completed, you need to restart the network service for it to take effect. Use the following command.
service network restart
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