mysql 安装配置问题

gistfile1.txt

1. root登录mysql出错

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)


由于需要注意5.7.* 之后的版本，需要找到初始密码，登录后修改密码：
```
$ sudo grep 'temporary password' /var/log/mysqld.log

$ mysql -uroot -p

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass$'; 
```

2. 修改密码失败

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

```
mysql> set global validate_password_policy=0;
```

参考：
http://stackoverflow.com/questions/21944936/error-1045-28000-access-denied-for-user-rootlocalhost-using-password-y

http://www.cnblogs.com/ivictor/p/5142809.html