mysql修改root密码的多种方法

方法1： 用SET PASSWORD命令

　　mysql -u root

　　mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');

方法2：用mysqladmin

　　mysqladmin -u root password "newpass"

　　如果root已经设置过密码，采用如下方法

　　mysqladmin -u root password oldpass "newpass"

方法3： 用UPDATE直接编辑user表

　　mysql -u root

　　mysql> use mysql;

　　mysql> UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root';

　　mysql> FLUSH PRIVILEGES;

在丢失root密码的时候，可以这样

[root@mysql ~]# /etc/init.d/mysqld stop
Shutting down MySQL. SUCCESS!

[root@mysql ~]# mysqld_safe --skip-grant-tables&
[1] 27426
[root@mysql ~]# 170220 18:48:38 mysqld_safe Logging to '/application/mysql/data/mysql.err'.
170220 18:48:38 mysqld_safe Starting mysqld daemon with databases from /application/mysql/data

[root@mysql ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.5.49 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> UPDATE mysql.user SET password=PASSWORD("oldboy123") WHERE user='root';
Query OK, 4 rows affected (0.00 sec)
Rows matched: 4 Changed: 4 Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

mysql> exit
Bye

 方法四：

自己查找路径:

/etc/mysql/conf.d/

/etc/mysql/mysql.conf.d/