How to solve the problem that the yum command cannot be used in CentOS

Sometimes the CentOS7 system that has just been installed finds that it cannot be updated using the yum command. An error will occur during the update. We can solve it through the following steps.

How to solve the problem that the yum command cannot be used in CentOS

1. Set the network card to start automatically at boot

To solve this problem, you must first confirm whether the network card has been started. When CentOS7 is first installed, the network card may be turned off and you need to turn it on yourself.

1. Enter the command "cd /etc/sysconfig/network-scripts" and use the command "ls -a" to view all files in the directory.

2. Modify the network card configuration file of ifcfg-ens33. Enter the command "vi ifcfg-ens33" to enter the vi editor, and press the "i" or "insert" key to enter editing mode.

3. Change the value of "ONBOOT" to "yes", then press esc to exit the edit mode, enter ":wq" to save and exit

4. Restart the network card and enter the command "service network restart".

Recommended learning: Linux video tutorial

2. Set up domestic dns server

If the network card has been turned on, the problem still exists If you have a problem, you can try configuring domestic DNS.

1. Enter the command "vi /etc/resolv.conf"

2. Add "nameserver 114.114.114.114"

3. Restart the network card and enter the command "service network restart".

3. Modify the address in CentOS-Base.repo

If the above method still fails, you can try modifying the address in CentOS-Base.repo

1. Enter "/etc/yum.repos.d".

2. Edit "vi CentOS-Base.repo".

3. Comment out all "mirrorlist" and uncomment all "baseurl".

4. Restart the system.

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