nagios 出现nagios Permission denied类似的报错，具体报错我贴在下面，这样的原因就是selinux没关。关闭即可
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1、临时关闭（不用重启机器）：
setenforce 0 ##设置SELinux 成为permissive模式
##setenforce 1 设置SELinux 成为enforcing模式
2、修改配置文件需要重启机器：
修改/etc/selinux/config 文件
将SELINUX=enforcing改为SELINUX=disabled
重启机器即可
Permission denied: exec of '/usr/local/nagios/sbin/status.cgi' failed, referer:[Thu Jun 01 23:59:34 2017]
[error] [client 192.168.226.1] (13)Permission denied: exec of '/usr/local/nagios/sbin/status.cgi' failed, referer: http://192.168.226.128/nagios/side.php
[Thu Jun 01 23:59:34 2017] [error] [client 192.168.226.1] Premature end of script headers: status.cgi, referer: http://192.168.226.128/nagios/side.php
[Thu Jun 01 23:59:36 2017] [error] [client 192.168.226.1] (13)Permission denied: exec of '/usr/local/nagios/sbin/status.cgi' failed, referer: http://192.168.226.128/nagios/side.php
[Thu Jun 01 23:59:36 2017] [error] [client 192.168.226.1] Premature end of script headers: status.cgi, referer: http://192.168.226.128/nagios/side.php
[Thu Jun 01 23:59:37 2017] [error] [client 192.168.226.1] (13)Permission denied: exec of '/usr/local/nagios/sbin/statusmap.cgi' failed, referer: http://192.168.226.128/nagios/side.php
[Thu Jun 01 23:59:37 2017] [error] [client 192.168.226.1] Premature end of script headers: statusmap.cgi, referer: http://192.168.226.128/nagios/side.php
[Fri Jun 02 00:04:16 2017] [notice] caught SIGTERM, shutting down
[Fri Jun 02 00:04:31 2017] [notice] SELinux policy enabled; httpd running as context unconfined_u:system_r:httpd_t:s0
