设置用户密码
方法一
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('NewPassword');
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123456');
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> q
Bye
[root@node ~]# mysql -uroot -p123456
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 5
Server version: 5.6.39 MySQL Community Server (GPL)
Copyright (c) 2000, 2018, 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>
方法二
UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root';
mysql> UPDATE mysql.user SET Password = PASSWORD('234567') WHERE user = 'root';
Query OK, 2 rows affected (0.00 sec)
Rows matched: 2 Changed: 2 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> q
Bye
# 这里使用新密码登陆
[root@node ~]# mysql -uroot -p234567
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 16
Server version: 5.6.39 MySQL Community Server (GPL)
Copyright (c) 2000, 2018, 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>
丢失root密码找回
两种方式：
- 在启动的时候增加
--skip-grant-tables参数启动 - 在
my.cnf配置文件中的mysql模块中添加下面参数skip-grant-tables = 1
上面两种方式效果相同
使用后，启动mysql，就可以使直接使用mysql 命令登陆，无需密码，进入后直接修改root密码即可，最后去掉参数或者配置文件中的参数重启数据库即可；