After installing the CentOS7 text interface version, the Internet cannot be connected, and the yum installation software prompts cannot find a valid baseurl for repo:base/7/x86_

*The obvious manifestations of not being able to connect to the Internet are:

　　1. Error: cannot find a valid baseurl or repo:base appears in yum install

　　2. Ping host will prompt unknown host



Method 1.

　　1. Open vi /etc/sysconfig/network-scripts/ifcfg -eth0 (each machine may be different, but the format will be "ifcfg-eth number"), change ONBOOT=no to ONBOOT=yes

　　2. Restart the network: service network restart

Method 2.

　　1. Open vi /etc /resolv.conf, add nameserver 8.8.8.8

　　2. Restart the network: service network restart