Error: Could not open command file '/usr/local/nagios-4.0.7/

[tokiwinter]

Hi,

I'm receiving the well-known "Error: Could not open command file '/usr/local/nagios/var/rw/nagios.cmd' for update!" error message on Nagios Core 4.0.7 on Ubuntu 14.04 LTS running under Nginx.

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# ls -ld /usr/local/nagios/var/rw
drwxrwsr-x 2 nagios nagcmd 4096 Jul 11 21:32 /usr/local/nagios/var/rw
# ls -l /usr/local/nagios/var/rw
total 0
prw-rw---- 1 nagios nagcmd 0 Jul 11 21:32 nagios.cmd
srw-rw---- 1 nagios nagcmd 0 Jul 11 21:32 nagios.qh
# groups www-data
www-data : www-data nagcmd

I can su to the www-data user and create files in that directory, as well as echo data to the pipe.

Any ideas as to where the problem may be? I'm pretty sure everything is set up correctly and I've performed many Nagios installations previously without encountering this problem.

I've tried it with Apparmor disabled too in case that was a problem, which it isn't.

Cheers,
Toki

[sreinhardt]

I just want to start by clarifing, are you seeing:

"Error: Could not open command file '/usr/local/nagios/var/rw/nagios.cmd' for update!"
OR
"Error: Could not open command file '/usr/local/nagios-4.0.7/var/rw/nagios.cmd' for update!"

I only ask because the title seems rather specific and different from what you were showing in the post.

[tokiwinter]

Thanks for the reply. I'm seeing ""Error: Could not open command file '/usr/local/nagios-4.0.7/var/rw/nagios.cmd' for update!"" - but /usr/local/nagios is just a symlink to /usr/local/nagios-4.0.7.

[abrist]

Is the nagcmd group configured?

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grep nag /etc/group

Did you configure with the command grouop option?

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./configure --with-command-group=nagcmd

[tokiwinter]

Hi,

The group is configured:

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# grep nagcmd /etc/group
nagcmd:x:1001:nagios,www-data

And I did configure with the --with-command-group option:

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# history | grep -- --with-command-group
   70  ./configure --prefix=/usr/local/nagios-4.0.7 --sysconfdir=/etc/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-command-user=nagios --with-command-group=nagcmd

As a workaround, I can:

Code: Select all

 chgrp www-data nagios.cmd

But it should work fine without that - any more ideas?

Cheers,
Toki

[lmiltchev]

70 ./configure --prefix=/usr/local/nagios-4.0.7 --sysconfdir=/etc/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-command-user=nagios --with-command-group=nagcmd

You would normally use

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./configure --with-command-group=nagcmd

when you compile nagios, and

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./configure --with-nagios-user=nagios --with-nagios-group=nagios

when you compile nagios plugins... It seems you used them all in one go... Is there any reason why you used "--with-command-user=nagios"?

[tokiwinter]

Thanks for getting back to me. I saw '--with-command-user=nagios' as a configure option and used it - although looking at the Quickstart guide it seems this isn't required and is perhaps the cause of my issue. Should I recompile Nagios with these options (including the --with-nagios-group and --with-nagios-user options) removed from the configure?

[tokiwinter]

Looking at the output at the end of configure, it defaults to using these values anyway:

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...
General Options:
 -------------------------
        Nagios executable:  nagios
        Nagios user/group:  nagios,nagios
       Command user/group:  nagios,nagcmd
...

I've reconfigured after a make clean with:

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./configure --prefix=/usr/local/nagios-4.0.7 --with-command-group=nagcmd --sysconfdir=/etc/nagios

Then make all, make install, make install-commandmode

And the problem persists:

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Error: Could not open command file '/usr/local/nagios-4.0.7/var/rw/nagios.cmd' for update!

Cheers,
Toki

[abrist]

Does your nagios.cfg have the correct path for the "command_file" directive?

[tokiwinter]

It does:

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# grep command_file /etc/nagios/nagios.cfg
command_file=/usr/local/nagios-4.0.7/var/rw/nagios.cmd
# ls -l /usr/local/nagios-4.0.7/var/rw/nagios.cmd
prw-rw---- 1 nagios nagcmd 0 Jul 16 11:38 /usr/local/nagios-4.0.7/var/rw/nagios.cmd