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How To Create Nagios Plugins With Bash On CentOS 6

Bash is a popular command processor available on Linux by default.
This time, we will expand on this idea and create Nagios plugins using Bash.

Step 1 - Install RPMForge Repository and NRPE on client

rpm -ivh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
yum -y install nagios-nrpe
useradd nrpe && chkconfig nrpe on

Step 2 - Create your Bash Script

It would be a good idea to keep your plugins in same directory as other Nagios plugins (/usr/lib64/nagios/plugins/ for example). For our example, we will create a script that checks current disk usage by calling "df" from shell, and throw an alert if it is over 85% used:
used_space=`df -h / | grep -v Filesystem | awk '{print $5}' | sed 's/%//g'`
case $used_space in
echo "OK - $used_space% of disk space used."
exit 0
echo "WARNING - $used_space% of disk space used."
exit 1
echo "CRITICAL - $used_space% of disk space used."
exit 2
echo "UNKNOWN - $used_space% of disk space used."
exit 3

We will save this script in /usr/lib64/nagios/plugins/usedspace.sh and make it executable:
chmod +x /usr/lib64/nagios/plugins/usedspace.sh

The entire Nagios NRPE plugin boils down to using exit codes to trigger alerts.
You introduce your level of logic to the script, and if you want to trigger an alert (whether it is OK, WARNING, CRITICAL, or UNKNOWN) - you specify an exit code.
Refer to the following Nagios Exit Codes:

Nagios Exit Codes

Exit Code Status
0 OK

Step 3 - Add Your Script to NRPE configuration on client host

Delete original /etc/nagios/nrpe.cfg and add the following lines to it:


Where is our monitoring server from previous articles. Change these to your own values.
Make sure to restart Nagios NRPE service:
service nrpe restart

Step 4 - Add Your New Command to Nagios Checks on Nagios Monitoring Server

Define new command in /etc/nagios/objects/commands.cfg
define command{
        command_name    usedspace_bash
        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c usedspace_bash

As you can see, it uses NRPE to make TCP connections to port 5666 and run command 'usedspace_bash', which we defined in /etc/nagios/nrpe.cfg on that remote host.
Add this check to your Nagios configuration file for client.
For our example, we will monitor a server called MyCentOS and edit /etc/nagios/servers/MyCentOS.cfg
define service {
        use                             generic-service
        host_name                       MyCentOS
        service_description             Custom Disk Checker In Bash
        check_command                   usedspace_bash
Restart Nagios:
service nagios restart

Verify that the new check is working and you are all done!
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