[caibo@localhost /]firewall−cmd–zone=public–add−port=3306/tcp–permanentsuccess[caibo@localhost/]firewall−cmd–zone=public–add−port=3306/tcp–permanentsuccess[caibo@localhost/]<script type="math/tex" id="MathJax-Element-1"> firewall-cmd –zone=public –add-port=3306/tcp –permanent success [caibo@localhost /]</script> firewall-cmd –reload

systemctl stop firewalld.service #停止
systemctl disable firewalld.service #禁用
mysql安装后还要允许远程连接，其他服务器才能连接到本地的数据库。

mysql账户是否不允许远程连接。如果无法连接可以尝试以下方法：

mysql -u root -p    //登录MySQL 
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'WITH GRANT OPTION;     //任何远程主机都可以访问数据库 
mysql> FLUSH PRIVILEGES;    //需要输入次命令使修改生效
mysql> EXIT    //退出

也可以通过修改表来实现远程：

mysql -u root -p

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