What if MySQL database forgets its password???

thought

Close the service , Skip password verification , Opening service , Password-free login , Change Password , Restart service password login

Realization

 Close the service ：systemctl stop mysqld
 Skip password verification ： stay /etc/my.cnf Medium [mysqld] Add below skip-grant-tables
 Opening service ：systemctl  start  mysqld
 Access to database  mysql -uroot 
 Get into mysql library ：use mysql;
 Update the password ：update user  set  authentication_string=password("qf1234") where user="root";
 Refresh the permissions ：flush privileges;
 Exit database ： exit
 take skip-grant-tables notes 
 restart systemctl restart mysqld
 Log in with the new password