1.在root用户下，停止mysql

service mysqld stop

2.vi /etc/my.cnf

在[mysqld]的段中加上一句skip-grant-tables

[mysqld]

skip-grant-tables

shift+z+z;保存退出

3.重新启动mysql

systemctl start mysqld

3.登录修改mysql 的密码

[root@python2 hadoop]# mysql -uroot -p

Enter password:

一直敲回车

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2

Server version: 5.7.21 MySQL Community Server (GPL)

看到welcome登录成功

5.FLUSH PRIVILEGES;  执行这条命令刷新

6.授权

mysql> GRANT ALL PRIVILEGES ON . TO ‘myuser’@’%'IDENTIFIED BY ‘mypassword’ WITH GRANT OPTION;

Query OK, 0 rows affected, 1 warning (0.01 sec)

6：修改密码

mysql> ALTER USER ‘root’@‘localhost’ IDENTIFIED BY ‘123456’;

Query OK, 0 rows affected (0.00 sec)

7.退出  quit;

8. 到vi /etc/my.cnf 删除skip-grant-tables

7.登录mysql 成功修改密码并登录
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原文链接：https://blog.csdn.net/baiyan_er/article/details/79966217