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

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

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.

About admin

I have been working with Linux based systems since 2002. I hope the article published on this site will be useful to those new to server administration.
  • Linbynd

    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…

    • jj

      not working.

      • Admin

        This does not apply to every situation since there could be other issues as well, but this is a method to try and has fixed it for our situations.

  • Babu Dhinakaran S


    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


    your are done..

    • Aniruddha

      Thanks Babu Dhinakaran S…..Works like dream. Thanks a lot!!!! 🙂

    • srikanth

      Its not working

    • JohnOCFII

      Thanks Babu – some how in a partial re-installation apache was left out of the permissions in /etc/group. This fixed me right up!

  • me


  • Pawel

    try that:
    chcon -R -t httpd_sys_script_rw_t /usr/local/nagios/var/rw

    • Ariel Rivera

      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.

  • Pingback: Nagios: Could not open command file '/usr/local/nagios/var/rw/nagios.cmd' for update! | FreyrLin's()

  • Andy

    That got it working for me on my Raspberry Pi. Thanks.

  • Christopher Alexander La Barba

    Worked like a charm thank you!!!!