http://blog.csdn.net/wobin/article/details/10266165
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
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