今天又重新部署了下easyhadoop，结果apache后台服务器报这个错误：
[Fri Dec 13 10:32:41 2013] [notice] SIGHUP received. Attempting to restart
[Fri Dec 13 10:32:41 2013] [notice] Digest: generating secret for digest authentication ...
[Fri Dec 13 10:32:41 2013] [notice] Digest: done
[Fri Dec 13 10:32:41 2013] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 configured -- resuming normal operations
[Fri Dec 13 10:33:00 2013] [error] [client 192.168.137.119] PHP Warning: require_once(/var/www/html/system/core/CodeIgniter.php): failed to open stream: Permission denied in /var/www/html/index.php on line 202
[Fri Dec 13 10:33:00 2013] [error] [client 192.168.137.119] PHP Fatal error: require_once(): Failed opening required '/var/www/html/system/core/CodeIgniter.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/index.php on line 202
结果搞了很久，哎，其实就是权限问题，我就不明白了，我都是一模一样的安装，系统都是一样的，居然安装后的权限不一样。仔细查看下，还居然真是权限不一样，晕。参考这里 http://stackoverflow.com/questions/5326531/php-warning-unknown-failed-to-open-stream
直接运行：
chmod -R 755 /var/www
即可，默认是root用户；
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