Once MySQL was installed, an error was reported when executing MySQL – uroot – p123456: access denied for user ‘root’ @’localhost ‘

Scheme:

Use sudo to execute the command: sudo?MySQL – uroot – p123456

After entering mysql, give the corresponding user permission

This problem can be solved by modifying variables.
Note: 8.0 is more variable with “. “than 5.7, so only half setting is not enough.

Separately executed:
set global validate_password.policy=0;

set global validate_password.length=4;