How to solve the problem of being unable to connect to the Internet after Centos7 installation

First enter the directory: /etc/sysconfig/network-scripts/

Then edit ifcfg-ens33. At this time, pay attention to whether you have editing permissions. You can su to enter the root user, use chmod 777 ifcfg-ens33 to give the file full read and write permissions, then vim ifcfg-ens33, enter the command i to enter the editing mode, and change ONBOOT=no to ONBOOT= yes

Press esc to enter command mode and enter: wq! Save and exit, then restart the network: service network restart

After that

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