mysql5.7安装上后，会生成随机密码，登录时需要查看cat /var/log/mysqld.log ，

里面有随机生成的密码

[Note] A temporary password is generated for root@localhost: 2Hh,uKryPJ-k

登录成功后，会强制要求先改密码

修改密码会报错

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

原因是mysql增强了安全性，对密码要求较严格

alter user ‘root‘@‘localhost‘ identified by ‘2HhuKryPJ-k‘; 

本文出自 “青春邓勇” 博客，请务必保留此出处http://dengyong.blog.51cto.com/8409869/1855841

mysql 5.7