检测是否为selinux导致httpd启动失败，若setenforce 0以后就可以启动，就表示selinux配置不当。
首先本机要支持semanage命令，安装方法网上有。
semanage port -l | grep http //查看润徐httpd的端口
[root@localhost logs]# semanage port -l | grep http
http_cache_port_t tcp , , , , -
http_cache_port_t udp ,
http_port_t tcp , , , , ,
pegasus_http_port_t tcp
pegasus_https_port_t tcp
semanage port -a -t http_port_t -p tcp 81 //添加81端口
http_port_t tcp , , , , , ,
再看就有了，然后
[root@localhost logs]# setenforce
[root@localhost logs]# service httpd start
Starting httpd:
[root@localhost logs]# service httpd status
httpd (pid ) is running...
开机启动
chkconfig httpd on
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页面错误
httpd You don't have permission to access / on this server.
日志显示
Permission denied: /home/airc/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable
解决
chmod -R 755 /home/airc/
原因DocumentRoot的父目录权限错误