http://fuzongfan.blog.163.com/blog/static/978169622013101314051998/

在CentOS上使用yum命令安装mysql后，使用默认端口3306能成功启动，但在/etc/my.cnf里更改端口，mysql启动不成功，后查阅相关资料总结如下：

这是更改端口后，进入/var/log/mysqld.log里摘取的启动失败相关日志：

130823 17:21:14 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 130823 17:21:14 [Warning] '--default-character-set' is deprecated and will be removed in a future release. Please use '--character-set-server' instead. 130823 17:21:14  InnoDB: Initializing buffer pool, size = 8.0M 130823 17:21:14  InnoDB: Completed initialization of buffer pool 130823 17:21:14  InnoDB: Started; log sequence number 0 44233 130823 17:21:14 [ERROR] Can't start server: Bind on TCP/IP port: Permission denied 130823 17:21:14 [ERROR] Do you already have another mysqld server running on port: 8060 ? 130823 17:21:14 [ERROR] Aborting

130823 17:21:14  InnoDB: Starting shutdown... 130823 17:21:19  InnoDB: Shutdown completed; log sequence number 0 44233 130823 17:21:19 [Note] /usr/libexec/mysqld: Shutdown complete

解决如下：

1.  防火墙问题

vi /etc/sysconfig/iptables

添加如下行：

-A INPUT -m state --state NEW -m tcp -p tcp --dport 8060 -j ACCEPT

 第一种方法是开放外网端口，第二种方式用于本地启动；

不做第一步操作，无法远程访问数据库

2. SELinux问题

方法一： 不需要重启Linux:  [root@dytl05 ~]# setenforce 0

 方法二：需要重启Linux: vi /etc/selinux/config

SELINUX=disabled