在web界面開啓服務狀態報警，提示：
Error: Could not open command file '/usr/local/nagios/var/rw/nagios.cmd' for update!
The permissions on the external command file and/or directory may be incorrect. Read the FAQs on how to setup proper permissions.
An error occurred while attempting to commit your command for processing.
Return from whence you came 
這個主要是apache 用戶 沒有執行權限 /usr/local/nagios/var/rw/nagios.cmd 造成，解決方法有幾種：
1.在啓動nagios的時候給nagios.cmd權限
通過修改nagios的啓動腳加入chmod -R 777 $NagiosVarDir/rw
[root@localhost nagios]# vim /etc/init.d/nagios 