MySQL5.7查看初始密码以及设置密码复杂度

1.查看初始密码：

[root@VM_225_102_centos ~]# grep 'temporary password' /var/log/mysqld.log 
2016-07-08T02:25:46.311098Z 1 [Note] A temporary password is generated for root@localhost: MtPqF0/oN5zo

mysql> set global validate_password_policy=0; 策略设为0，表示只检查密码长度

mysql> set global validate_password_length=6; 默认密码长度为6

mysql> alter user root@"localhost" identified by '123456'; 修改完成