CentOS7 で yum を使用して MySQL をインストールする方法

[root@localhost ~]# wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

[root@localhost ~]# yum -y install mysql57-community-release-el7-10.noarch.rpm

[root@localhost ~]# yum -y install mysql-community-server

[root@localhost ~]# systemctl start  mysqld.service

[root@localhost ~]# systemctl status mysqld.service

[root@localhost ~]# grep "password" /var/log/mysqld.log

[root@localhost ~]# mysql -uroot -p

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password';

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password_check_user_name    | OFF   |
| validate_password_dictionary_file    |       |
| validate_password_length             | 4     |
| validate_password_mixed_case_count   | 1     |
| validate_password_number_count       | 1     |
| validate_password_policy             | LOW   |
| validate_password_special_char_count | 1     |
+--------------------------------------+-------+
7 rows in set (0.01 sec)

validate_password_length = validate_password_number_count + validate_password_special_char_count + (2 * validate_password_mixed_case_count)我的是已经修改过的，初始情况下第一个的值是ON，validate_password_length是8。可以通过如下命令修改：

mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;