Error: Could not open command file ‘/usr/local/nagios/var/rw/nagios.cmd’ for update!

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If you’re updating nagios, and/or you are trying to reschedule checks manually, and you get the error below:

Error: Could not open command file ‘/usr/local/nagios/var/rw/nagios.cmd’ for update!

Then it means that the permissions on the folder are messed up. Don’t bother setting up the permissions on the file itself, nagios.cmd,  since that file gets recreated very often, so:

chown nagios.nagcmd /usr/local/nagios/var/rw 
chmod g+rwx /usr/local/nagios/var/rw 
chmod g+s /usr/local/nagios/var/rw

This should get you up and running without problems.

Originally posted 2016-03-01 00:43:51.

13 COMMENTS

  1. i have done the same steps over and over again.. but has not worked for me…[[email protected] sbin]# /usr/local/nagios/bin/nagios -V

    Nagios Core 3.2.2

    —————————–

    ll -d /usr/local/nagios/var/rw/
    drwxrwsr-x 2 nagios nagcmd 4096 May  2 02:02 /usr/local/nagios/var/rw/
    [[email protected] sbin]# ll /usr/local/nagios/var/rw/
    total 0
    prwxrwxrwx 1 nagios nagcmd 0 May  2 02:06 nagios.cmd

    Only works after I give full permission to nagios.cmd… after a restart…

  2. Guys,

    This means the the nagios.cmd file doesn’t has a permission to execute from the WEB i.e., apache. do the following and restart the Nagios and Apache/httpd
    /etc/group

    nagios:x:500:nagios,apache
    nagcmd:x:501:nagios,apache

    your are done..

    • This one worked for me on RedHat 5.
      After I added the “nagios, apache, www-data ” tip it was still not working , so this “chcon” solved it.

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