mysql ubuntu 開啟3306端口，設置遠程訪問

遠程登陸數據庫的時候出現了下面出錯信息 :
ERROR 2003 ( HY000 ) : Can 't connect to MySQL server on ' xxx.xxx.xxx.xxx ',
經過今天下午的反復糾結,關於MySql數據庫無法遠程連接的問題可以歸結為以下幾點:
1). 沒有授予相應的權限:

例如，你想root使用123456從任何主機連接到mysql服務器

mysql>GRANT ALL PRIVILEGES ON *.* TO ' root '@' % ' IDENTIFIED BY ' 123456 ' WITH GRANT OPTION;
mysql>FLUSH RIVILEGES

如果你想允許用戶jack從ip為10.10.50.127的主機連接到mysql服務器，並使用654321作為密碼

mysql>GRANT ALL PRIVILEGES ON *.* TO ' jack '@’10.10.50.127’ IDENTIFIED BY ' 654321 ' WITH GRANT OPTION;
mysql>FLUSH RIVILEGES

2). 修改mysql數據庫中的user表使相應的用戶能從某一主機登陸

mysql -u root –p
mysql>use mysql;
mysql>update user set host = ' % ' where user = ' root ';
mysql>select host, user from user;

3). 防火牆禁止了3306端口，以ufw為例　　　　

root@xxx:~/python_pro/newsite# ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip
root@xxx:~/python_pro/newsite# ufw allow 3306
Rule added
Rule added (v6)
root@vultr:~/python_pro/newsite# ufw reload
Firewall reloaded

 

4). 修改MySQL的配置文件
(我這邊是在這個目錄，每個人目錄不同) /etc/mysql/mysql.conf.d/mysqld.cnf，
因為默認3306端口只允許本地訪問的，注釋掉這行

# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.

#bind-address = 127.0.0.1

然后重啟Mysql，service mysql restart