First, add the MySQL Yum repository to your system's repository list. This is a one-time operation, which can be performed by installing an RPM provided by MySQL. Follow these steps:
Go to the Download MySQL Yum Repository page (http://dev.mysql.com/downloads/repo/yum/) in the MySQL Developer Zone.
Select and download the release package for your platform.
Install the downloaded release package with the following command (except for EL5-based systems), replacing_platform-and-version-specific-package-name
_with the name of the downloaded RPM package:
shell> sudo yum localinstall platform-and-version-specific-package-name.rpm
yum update
Install MySQL by the following command (for dnf-enabled systems, replaceyumin the command withdnf):
shell> sudo yum install mysql-community-server
Start the MySQL server with the following command:
shell> sudo service mysqld start
vi my.cnf
[mysqld]
--skip-grant-tables
更改密码:
mysql> use mysql; mysql> update mysql.user set authentication_string=password('root') where user='root'and Host ='localhost'; mysql> flush privileges;
mysql> create database yan1; ERROR 1820 (HY000): You must SET PASSWORD before executing this statement mysql> SET PASSWORD = PASSWORD('root'); Query OK, 0 rows affected (0.03 sec) mysql> create database yan1; Query OK, 1 row affected (0.00 sec)
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements 这个其实与validate_password_policy的值有关。 validate_password_policy有以下取值: Policy Tests Performed 0 or LOW Length 1 or MEDIUM Length; numeric, lowercase/uppercase, and special characters 2 or STRONG Length; numeric, lowercase/uppercase, and special characters; dictionary file 默认是1,即MEDIUM,所以刚开始设置的密码必须符合长度,且必须含有数字,小写或大写字母,特殊字符。 有时候,只是为了自己测试,不想密码设置得那么复杂,譬如说,我只想设置root的密码为123456。 必须修改两个全局参数: 首先,修改validate_password_policy参数的值 mysql> set global validate_password_policy=0; Query OK, 0 rows affected (0.00 sec)
【问题】
有时候,只是为了自己测试,不想密码设置得那么复杂,譬如只想设置root的密码为123456。
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123456');
但是会报错:
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123'); ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
【原因】
原来MySQL5.6.6版本之后增加了密码强度验证插件validate_password,相关参数设置的较为严格。
使用了该插件会检查设置的密码是否符合当前设置的强度规则,若不满足则拒绝设置。影响的语句和函数有:create user,grant,set password,password(),old password。
【解决】
1) 查看MySQL全局参数配置
该问题其实与mysql的validate_password_policy的值有关。
查看一下msyql密码相关的几个全局参数:
mysql> select @@validate_password_policy; +----------------------------+ | @@validate_password_policy | +----------------------------+ | MEDIUM | +----------------------------+ 1 row in set (0.00 sec) 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 (0.08 sec)
)参数解释
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,参数默认为8,它有最小值的限制,最小值为:validate_password_number_count + validate_password_special_char_count + (2 * validate_password_mixed_case_count)
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。有以下取值:
Policy Tests Performed
0 or LOW Length
1 or MEDIUM Length; numeric, lowercase/uppercase, and special characters
2 or STRONG Length; numeric, lowercase/uppercase, and special characters; dictionary file
默认是1,即MEDIUM,所以刚开始设置的密码必须符合长度,且必须含有数字,小写或大写字母,特殊字符。
validate_password_special_char_count
密码至少要包含的特殊字符数。
3)修改mysql
参数配置
mysql> set global validate_password_policy=0; Query OK, 0 rows affected (0.05 sec) mysql> mysql> mysql> set global validate_password_mixed_case_count=0; Query OK, 0 rows affected (0.00 sec) mysql> set global validate_password_number_count=3; Query OK, 0 rows affected (0.00 sec) mysql> set global validate_password_special_char_count=0; Query OK, 0 rows affected (0.00 sec) mysql> set global validate_password_length=3; Query OK, 0 rows affected (0.00 sec) mysql> SHOW VARIABLES LIKE 'validate_password%'; +--------------------------------------+-------+ | Variable_name | Value | +--------------------------------------+-------+ | validate_password_dictionary_file | | | validate_password_length | 3 | | validate_password_mixed_case_count | 0 | | validate_password_number_count | 3 | | validate_password_policy | LOW | | validate_password_special_char_count | 0 | +--------------------------------------+-------+ 6 rows in set (0.00 sec)
4)修改简单密码:
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123'); Query OK, 0 rows affected, 1 warning (0.00 sec)