Error: Could not open command file '/opt/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.
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最近nagios出现以上问题，
解决方法：
将nagios和apache放到一个组nagcmd，问题解决
此问题可能与我修改了一次nagios数组有关系
[root@localhost etc]# id nagios
uid=607(nagios) gid=605(nagios) groups=605(nagios),607(nagcmd)
[root@localhost etc]# id apache
uid=48(apache) gid=48(apache) groups=48(apache),607(nagcmd)
另外修改完后，还需要重启一下apache
刚开始修改完毕后。我没有重启apache，还是出现问题。重启后问题解决
还有一个方法是：
手动修改它的权限改成777
/opt/nagios/var/rw/nagios.cmd
重启nagios还要修改权限
还有一个思路是
vim nagios.cfg
# NAGIOS GROUP
# This determines the effective group that Nagios should run as.
# You can either supply a group name or a GID.
nagios_group=nagcmd
将这里的nagios的数组改成nagcmd
无论怎么重启，都没问题
