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摘要:MySQL 5.7设置root密码方法update mysql.user set authentication_string=PASSWORD('****') where user='root' and host='localhost';
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操作系统：
[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.1.1503
MysQL版本5.7
mysql> select version();
+-----------+
| version() |
+-----------+
| 5.7.9 |
+-----------+
1 row in set (0.00 sec)
安装MySQL的yum repo源：
[root@localhost ~]# rpm -ivh http://repo.mysql.com//mysql57-community-release-el7-7.noarch.rpm
安装MySQL
[root@localhost ~]# yum -y install mysql-community-server mysql-community-client
修改mysql配置文件跳过密码验证
[root@localhost ~]# vim /etc/my.cnf
[mysqld]
skip-grant-tables
skip-networking
重启MySQL：
[root@localhost ~]# systemctl mysqld restart
匿名登录MySQL设置root密码：
[root@localhost ~]# mysql -uroot -p
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.9 MySQL Community Server (GPL)
Copyright (c) 2000, 2015, 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('test') where user='root' and host='localhost';
ERROR 1054 (42S22): Unknown column 'PASSWORD' in 'field list'
提醒：从5.7开始使用authentication_string不再使用password字段存放密码所以提示出错。
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'test' ;
ERROR 1131 (42000): You are using MySQL as an anonymous user and anonymous users are not allowed to change passwords
查看mysql.user表密码字段：
mysql>
desc mysql.user;
mysql> update mysql.user set authentication_string=PASSWORD('test') where user='root' and host='localhost';
Query OK, 1 row affected, 1 warning (0.07 sec)
Rows matched: 1 Changed: 1 Warnings: 1
mysql> flush privileges;
Query OK, 0 rows affected (0.06 sec)
mysql> select host,user,password from mysql.user;
mysql> exit;
Bye
取消跳过密码认证：
[root@localhost ~]# vim /etc/my.cnf
[mysqld]
#skip-grant-tables
#skip-networking
重启MySQL：
[root@localhost ~]# systemctl mysqld restart
必须使用alter user重置密码：
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
重新设置新密码：
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '********'
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement
密码需要复杂度要求：
mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name | Value |
+--------------------------------------+--------+
| validate_password_dictionary_file| |
| validate_password_length | 8 |
| validate_password_mixed_case_count| 1 |
| validate_password_number_count| 1 |
| validate_password_policy | MEDIUM |
| validate_password_special_char_count| 1 |
+--------------------------------------+--------+
6 rows in set (0.00 sec)
mysql> set password=password('xxxx');
Query OK, 0 rows affected (0.00 sec)