开启MySQL远程访问权限 允许远程连接（阿里云服务器）、linux关闭防火墙
1.登陆mysql：mysql -u root -p
mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | sys | +--------------------+ 4 rows in set (0.01 sec) mysql> use mysql; # 切换到mysql数据库 Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> select host,user from user; # 查询user表 +-----------+---------------+ | host | user | +-----------+---------------+ | % | root | | localhost | mysql.session | | localhost | mysql.sys | +-----------+---------------+ 5 rows in set (0.00 sec)
如果上述查询结果，root用户对应的host不为%，则修改用户权限
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root密码' WITH GRANT OPTION; # 修改权限 Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> FLUSH PRIVILEGES; Query OK, 0 rows affected (0.00 sec)
或创建用户
mysql>insert into user (host,user,password) values('122.114.155.163','admin',password('ygpassword'));
mysql>FLUSH PRIVILEGES;
mysql>GRANT ALL PRIVILEGES ON *.* TO 'admin'@'122.114.155.163'IDENTIFIED BY 'ygpassword' WITH GRANT OPTION;
mysql>FLUSH PRIVILEGES;
完成。（如果连接不成功，继续执行下面操作）
2.阿里云的ECS需要手动添加安全组规则
3.关闭防火墙（关闭防火墙，就可以外部访问了。不受端口限制。生产环境，最好开启防火墙，开启部分端口。）
1.永久有效
1 开启： chkconfig iptables on 2 关闭： chkconfig iptables off
2.即刻生效
1 开启： service iptables start 2 关闭： service iptables stop
3.开启部分端口
1 vim /etc/sysconfig/iptables
添加想要开启的相关端口
1 -A INPUT -m state --state NEW -m tcp -p tcp --dport 6379 -j ACCEPT 2 -A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT 3 -A INPUT -m state --state NEW -m tcp -p tcp --dport 8081 -j ACCEPT 4 -A INPUT -m state --state NEW -m tcp -p tcp --dport 8082 -j ACCEPT 5 -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
4.重启防火墙服务
1 service iptables restart
方法4：（腾讯云）
配置腾讯云服务器的安全组开放3306端口
