mysql5.7修改密码

　　为了提高安全性 mysql5.7中 user 表的 password 被 authentication_string 字段所取代，下面简绍几种mysql5.7下修改root密码的方法（其他用户也大同小异）。

法一：

mysql> alter user 'root'@'localhost' identified by 'cy7m0ypu8CpLFperzI45';

法二：

mysql> set password for 'root'@'localhost'=password('cy7m0ypu8CpLFperzI45');

法三：

mysql> update mysql.user set authentication_string=password('cy7m0ypu8CpLFperzI45') where user='root' and Host = 'localhost';

-- 记得最后要刷新权限
mysql> flush privileges;

具体示例：

[mysql@db134 application]$ /data/mysql/application/mysql/bin/mysql -uroot -p -h localhost --socket=/data/mysql/percona_server_new/run/mysql.sock
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.17-13-log

Copyright (c) 2009-2016 Percona LLC and/or its affiliates
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> set global validate_password_policy=LOW;
Query OK, 0 rows affected (0.00 sec)

mysql> set password for 'root'@'localhost'=password('cy7m0ypu8CpLFperzI45');
Query OK, 0 rows affected, 1 warning (0.08 sec)

mysql> alter user 'root'@'localhost' identified by 'cy7m0ypu8CpLFperzI45';
Query OK, 0 rows affected (0.01 sec)

mysql> update mysql.user set authentication_string=password('cy7m0ypu8CpLFperzI45') where user='root' and Host = 'localhost';
Query OK, 0 rows affected, 1 warning (0.05 sec)
Rows matched: 1  Changed: 0  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

-- 验证登录
[mysql@db134 application]$ /data/mysql/application/mysql/bin/mysql -uroot -p -h localhost --socket=/data/mysql/percona_server_new/run/mysql.sock 
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.17-13-log Percona Server (GPL), Release 13, Revision fd33d43

Copyright (c) 2009-2016 Percona LLC and/or its affiliates
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> exit
Bye
[mysql@db134 application]$