Nagios 4.1.1: fixing the Nagios - "Could not open command file /usr/local/nagios/var/rw/nagios.cmd’ for update"

Nagios - Could not open command file /usr/local/nagios/var/rw/nagios.cmd’ for update

Whenever we are trying to disable/enable  active check for a service through a Nagios web interface, but we can't make it.

The Nagios instance is running and configured on a Centos 6.7 distribution
Each time when we try to stop the service we get this message:  Could not open command file ‘/usr/local/nagios/var/rw/nagios.cmd’ for update!
Please follow these steps to fix this issue

 We have to stop the nagios and apache services

# service httpd stop

# service nagios stop

We needed to add the users nagios and apache to nagcmd group

# usermod -a -G nagcmd nagios

# usermod -a -G nagcmd apache

# usermod -a -g nagios apache

Change the permission of the folder where the nagios.cmd are there

# chown nagios:nagcmd /usr/local/nagios/var/rw

We needed to change start the nagios services

# service nagios start 

We needed to change the permissions of the nagios user and nagcmd group to the

# chown nagios:nagcmd /usr/local/nagios/var/rw/nagios.cmd

Restart the nagios services and start the apache services

# service httpd start

# service nagios start

Hope this will fix the isses 

Please check this while running this commands 

ls -l /usr/local/nagios/var/rw

We needed to check the SElinux if it is enforced change it to permissive, to check the SElinux status

# sestatus 

To change the SElinux temperorary

# getenforce

# setenforce 0

# service nagios restart

To change permenent

# vi /etc/sysconfig/selinux

# SELINUX=permissive

Nagios 4.1.1 other links 


Installing Nagios Core 4.1.1 on Centos 6.7

Adding Nagios Linux host to Nagios core server 

Adding Windows host to Nagios Core server

Adding MRTG to Nagios Core 4.1.1

Adding Nagios Graph to Nagios core 4.1.1

Keywords: Nagios, Monitoring, Linux host, Ading Linux host, Errors, Nagios Errors