Retrieve root password--Mysql5.6.36

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)

skip-grant-tables skip grant tables    during startup

In this mode, you can log in without a password, and commands related to authorization cannot be used

Operation process:

# 停止正在运行的mysql
/etc/init.d/mysqld stop

# 启动mysql
/application/mysql/bin/mysqld_safe --skip-grant-tables --skip-networking &
# 使用--skip-networking是为了禁止用户通过网络登录，此时无密登录，仅让自己无密登录进行设置密码

# 进入mysql进行操作
# 将root密码改为123456
mysql> use mysql;
mysql> update user set password=PASSWORD('123456') where user='root' and host='localhost';
mysql> flush privileges;

restart mysql

/etc/init.d/mysqld restart

login mysql with new password at login

Note: Readers modify the user's password according to their own situation, not only the root user, this blog post is for reference only!