MySQL5.7.12新密码登录方式及密码策略

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在Centos6.6上安装MySQL5.7.12时,遇到了一个问题

安装后在/root目录下没有发现有.mysql_secret这个文件,所以没有没法按照官方文档上说的那样使用,这里记录下,

解决方式:

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首先修改MySQL授权登录方式---(跳过授权验证方式启动MySQL):
[root@test ~]# mysqld_safe --skip-grant-tables &[1] 3401[root@test ~]# 2016-05-19T12:47:56.564385Z mysqld_safe Logging to '/var/log/mysqld.log'.2016-05-19T12:47:56.589376Z mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
检查MySQL启动情况[root@test
~]# ps -ef | grep mysqlroot 3401 2880 0 20:47 pts/1 00:00:00 /bin/sh /usr/bin/mysqld_safe --skip-grant-tablesmysql 3548 3401 0 20:47 pts/1 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --skip-grant-tables --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock
这时登录MySQL不再需要验证
[root@test ~]# mysql
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成功登录MySQL后:

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切换到mysql系统库:mysql> use mysql;修改root账户登录密码:mysql> update user set password=password('') where user='root';ERROR 1054 (42S22): Unknown column 'password' in 'field list'---报错没有password这个数据字段列描述user表mysql> desc user;...| authentication_string  | text                              | YES  |     | NULL                  |       || password_expired       | enum('N','Y')                     | NO   |     | N                     |       || password_last_changed  | timestamp                         | YES  |     | NULL                  |       || password_lifetime      | smallint(5) unsigned              | YES  |     | NULL                  |       || account_locked         | enum('N','Y')                     | NO   |     | N                     |       |+------------------------+-----------------------------------+------+-----+-----------------------+-------+---没发现password列,但是找到这5个跟密码相关的数据字段查询一下相关的密码信息:mysql> select user,host,authentication_string,password_expired from user;+-----------+-----------+-------------------------------------------+------------------+| user      | host      | authentication_string                     | password_expired |+-----------+-----------+-------------------------------------------+------------------+| root      | localhost | *9AA01F6E2A80A823ACB72CC07337E2911404B5B8 | Y                || mysql.sys | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | N                |+-----------+-----------+-------------------------------------------+------------------+---到这里不难发现root账户的密码已过期,还比5.6多出了一个mysql.sys用户修改密码mysql> update user set authentication_string=password('123abc') where user='root';Query OK, 1 row affected (0.00 sec)Rows matched: 1  Changed: 1  Warnings: 0mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)mysql> exit
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密码修改成功,测试:

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重启MySQL:[root@test ~]# /etc/init.d/mysqld restart登录测试:[root@test ~]# mysql -pEnter password: Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 3Server version: 5.7.12-enterprise-commercial-advanced...mysql> show databases;ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.---报错,需要使用alter user 修改密码
mysql
> alter user root@'localhost' identified by 'oracle';ERROR 1819 (HY000): Your password does not satisfy the current policy requirements---报错,密码不满足制定的密码负责度要求
mysql
> alter user 'root'@'localhost' identified by 'Abc!123D';Query OK, 0 rows affected (0.01 sec)mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema || sys |+--------------------+4 rows in set (0.00 sec)
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 关于密码策略

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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 (0.02 sec) mysql> show plugins;+----------------------------+----------+--------------------+----------------------+-------------+| Name                       | Status   | Type               | Library              | License     |+----------------------------+----------+--------------------+----------------------+-------------+| binlog                     | ACTIVE   | STORAGE ENGINE     | NULL                 | PROPRIETARY |...| validate_password          | ACTIVE   | VALIDATE PASSWORD  | validate_password.so | PROPRIETARY |+----------------------------+----------+--------------------+----------------------+-------------+---可以通过在配置文件[mysqld]标签中添加 validate_passwor=off ,来关闭密码策略如下:...| validate_password          | DISABLED | VALIDATE PASSWORD  | validate_password.so | PROPRIETARY |+----------------------------+----------+--------------------+----------------------+-------------+
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总结

1) 安装好mysql后,第一次启动时,root管理密码会在/root/.mysql_secret中随机生成

2) 至5.7后,MySQL的 mysql.user 表中的密码字段由之前的 password 改为 authentication_string

3) 使用--skip-grant-tables 参数启动,跳过MySQL的授权验证,--skip-networking参数,跳过远程登录

4) 修改MySQL密码方式:

法1:update user set authentication_string=password('123abc') where user='root';

法2:set password=password('newpassword');

法3:alter user root@'localhost' identified by 'oracle';

法4:在shell下使用MySQL工具:mysqladmin -uroot -poldpassword pasword "newpassword"

5) 关于MySQL密码策略:

决定是否使用该插件(及强制/永久强制使用)
--validate-password=ON/OFF/FORCE/FORCE_PLUS_PERMANENT
 
validate_password_dictionary_file           > 插件用于验证密码强度的字典文件路径。
validate_password_length                        > 密码最小长度。
validate_password_mixed_case_count     > 密码至少要包含的小写字母个数和大写字母个数。
validate_password_number_count    > 密码至少要包含的数字个数。
validate_password_policy                         > 密码强度检查等级,0/LOW、1/MEDIUM、2/STRONG
validate_password_special_char_count    > 密码至少要包含的特殊字符数。
 
其中关于validate_password_policy-密码强度检查等级:
0/LOW    > 只检查长度
1/MEDIUM      > 检查长度、数字、大小写、特殊字符
2/STRONG      > 检查长度、数字、大小写、特殊字符字典文件

后记

经过一段时间后,发现mysql初始密码原来被记录到了日志文件中

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查找日志位置
[root@test /var/lib/mysql]# ps -ef | grep mysqlroot 5604 1 0 22:40 pts/1 00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysqlmysql 5802 5604 5 22:40 pts/1 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sockroot 5837 2880 0 22:40 pts/1 00:00:00 grep --color mysql
藏在日志文件中的临时密码[root@test
/var/lib/mysql]# grep "A temporary password" /var/log/mysqld.log 2016-05-17T16:46:53.059632Z 1 [Note] A temporary password is generated for root@localhost: +wGVA#to(4tu
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