前言：本文主要介绍了因为SELinux对网站目录权限控制的不当而引起网站无法正常操作和访问的问题。
正文开始：今天下午闲着没有事做于是突然兴起想尝试安装下Drupal。以前用Wordpress做博客久了，总想着尝尝新。
按照Installtion Guide提示的安装步骤进行操作如下：
wgettar-zxvfdrupal-7.12.tar.gzmvdrupal-7.12/var/www/html/home_startcd /var/www/html/home_startcpsites/default/default.settings.phpsites/default/settings.phpchmoda+wsites/default/settings.phpchmoda+wsites/defaultmysqladmin-uusername-pcreatedatabasename #用正确的字符串代替username和databasename一切准备就绪！就等着进网站目录进行下一步配置了！
不幸的是，在浏览器中打开网站的目录后就遭遇了httpd的403拒绝访问提示。
这很显然，根据以往的经验可以判断是目录权限存在问题。
为了验证这一说法，我们可以检查httpd的错误日志。默认情况下日志就存在在/var/log/httpd/目录中。
[root@localhost~]#grep Permission /var/log/httpd/error_log[TueApr1009:07:042012][error][client127.0.0.1](13)Permissiondenied:accessto/startdenied[TueApr1009:07:502012][error][client127.0.0.1](13)Permissiondenied:accessto/start/denied[TueApr1009:08:072012][error][client127.0.0.1](13)Permissiondenied:accessto/start/denied[TueApr1009:10:062012][error][client127.0.0.1](13)Permissiondenied:accessto/start/denied[TueApr1009:11:082012][error][client127.0.0.1](13)Permissiondenied:accessto/start/denied[TueApr1009:11:172012][error][client127.0.0.1](13)Permissiondenied:accessto/startdenied[TueApr1009:11:342012][error][client::1](13)Permissiondenied:accessto/startdenied[TueApr1009:13:352012][error][client::1](13)Permissiondenied:accessto/startdenied[TueApr1009:13:512012][error][client::1](13)Permissiondenied:accessto/start/site/default/denied[TueApr1009:13:572012][error][client::1](13)Permissiondenied:accessto/start/sitesdenied[TueApr1009:14:512012][error][client::1](13)Permissiondenied:accessto/start/install.phpdenied[TueApr1009:18:572012][error][client::1](13)Permissiondenied:accessto/start/install.phpdenied[TueApr1009:19:012012][error][client::1](13)Permissiondenied:accessto/start/denied[TueApr1009:22:032012][error][client::1](13)Permissiondenied:accessto/startdenied[TueApr1009:22:212012][error][client::1](13)Permissiondenied:accessto/startdenied[TueApr1009:22:242012][error][client::1](13)Permissiondenied:accessto/startdenied[TueApr1009:22:272012][error][client127.0.0.1](13)Permissiondenied:accessto/startdenied[TueApr1009:27:022012][error][client127.0.0.1](13)Permissiondenied:accessto/startdenied[TueApr1009:27:052012][error][client127.0.0.1](13)Permissiondenied:accessto/startdenied[TueApr1009:27:072012][error][client127.0.0.1](13)Permissiondenied:accessto/startdenied[TueApr1012:09:582012][error][client127.0.0.1](13)Permissiondenied:accessto/home_startdenied[TueApr1012:42:382012][error][client127.0.0.1](13)Permissiondenied:accessto/home_startdenied[TueApr1012:42:402012][error][client127.0.0.1](13)Permissiondenied:accessto/home_startdenied[TueApr1012:44:152012][error][client127.0.0.1](13)Permissiondenied:accessto/home_startdenied[TueApr1012:44:202012][error][client127.0.0.1](13)Permissiondenied:accessto/home_startdenied[TueApr1020:53:212012][error][client::1](13)Permissiondenied:accessto/home_startdenied[TueApr1021:07:212012][error][client::1](13)Permissiondenied:accessto/home_startdenied[TueApr1021:14:482012][error][client::1](13)Permissiondenied:accessto/home_startdenied[root@localhost~]#再检查网站目录和文件的权限。为方便起见直接用-lZ选项。用于显示详细信息和SELinux权限信息
[root@localhosthtml]#ls-lZ-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0archive.htmldrwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0blogdrwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0blog_backup-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0blog.htm-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0blog.htmldrwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0cssdrwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0home_pagedrwxr-xr-x.rootrootunconfined_u:object_r:admin_home_t:s0home_start #问题行drwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0images-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0index.htm-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0index.html-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0info_php.phpdrwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0js-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0logdrwxr-xr-x.rootrootunconfined_u:object_r:admin_home_t:s0php #以前的遗留问题drwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0phpMyAdmin-3.4.10.1-all-languagesdrwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0PSDs-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0readme.txt-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0style.htm-rw-r–r–.rootrootunconfined_u:object_r:httpd_sys_content_t:s0style.htmldrwxr-xr-x.rootrootunconfined_u:object_r:httpd_sys_content_t:s0wiki显然上面显示的结果中的09、16两行的权限与其他网站目录不同。
再查看selinx的工作状态，判断是不是SELinux引起的。
[root@localhosthttpd]#sestatusSELinuxstatus:enabledSELinuxfsmount:/selinuxCurrentmode:enforcingModefromconfigfile:enforcingPolicyversion:24Policyfromconfigfile:targeted这就是导致网站权限不正确的原因。
我猜测可能是在selinux启用时对目录或文件进行操作导致的。因为最近我对SELinux进行了升级（以前没有遇到）。
所以使用chcon更改SELinux权限以及显示结果如下：
然后，再次打开浏览器输入地址，验证能否访问，如果可以访问就可以进行下一步配置了！
最后，还是那句话，遇到问题一定要仔细分析，，尽可能的通过自己的努力和分析发现问题所在，这样才能体会到解决问题的快乐！
乐观者在灾祸中看到机会;悲观者在机会中看到灾祸
