How to solve the problem that root user cannot log in in CentOS system

How to solve the problem that the root user cannot log in in the CentOS system

The solution is as follows:

1. First log in as an ordinary user

2. Then switch to the root user, the command is as follows

sudo su

3. After switching, you will have root permissions, and then use the command passwd to change the password of the root user

4. This Enter the new password twice, log out of the current user and then log in again as the root user.

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