Retrieve root password--Mysql5.7.17

System environment:

[root@db02 ~]# uname -m
x86_64
[root@db02 ~]# uname -r
2.6.32-696.el6.x86_64
[root@db02 ~]# cat /etc/redhat-release 
CentOS release 6.9 (Final)

5.6 and 5.7 are a bit different, in 5.6 the column name is password, but 5.7 is authentication_string

Operation process:

1. Modify /etc/my.cnf and add skip-grant-tables in the line below [mysqld]

[root@db02 ~]# vim /etc/my.cnf
[mysqld]
skip-grant-tables
……………………

2. Start mysql

/etc/init.d/mysqld-5.7.17 start

3. Enter the database without password and change the password

mysql> use mysql;
mysql> update user set authentication_string=PASSWORD('123yk') where user='root' and host='localhost';
mysql> flush privileges;

4. Modify /etc/my.cnf again and remove the skip-grant-tables just added

[root@db02 ~]# vim /etc/my.cnf
[mysqld]
# skip-grant-tables

5. Restart mysql

/etc/init.d/mysqld-5.7.17 restart

6. Log in with the newly modified password

/application/mysql-5.7.17/bin/mysql -uroot -p

Note: Users can modify and set passwords according to their own system environment and conditions. This blog post is for reference only.