msyql 禁止遠程訪問

1. use mysql
2. select host , user from user; 查看用戶 與 對應的host
3. 將 host 中是 %的改爲 localhost， 酌情也可以其他用戶 的host限制爲localhost
update user set host = "localhost" where user = "root" and host = "%"
4. 重啓mysql