遠程連接mysql 提示 Access denied for user 'root'@'192.168.3.20' (using password: YES)

是因爲沒有正確的開放mysql遠程權限
1.
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
用戶root 密碼是123456
2.
mysql> FLUSH PRIVILEGES;
3.重啓mysql
/etc/init.d/mysql restart