What to do if the yum command cannot be used in centos7 system

1. Use vi editor to modify the network card file

vi /etc/sysconfig/network-scripts/ifcfg-ens33

(Recommended tutorial: centos tutorial)

2. Modify ONBOOT=no to yes

3. Restart the network card

service network restart

4. Re-execute the yum command.

Recommended related video tutorials: linux video tutorial

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