Nagios custom scripts

Create Nagios Plugins With Bash On CentOS

Step :1 - Install RPMForge Repository and NRPE on client VPS

#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

#cd /usr/lib64/nagios/plugins/

# cat check_warnings.sh

#!/bin/bash

countWarnings=$(df -h / | grep -v Filesystem | awk '{print $5}' | sed 's/%//g')

 if (($countWarnings<=5)); then

                echo "OK - Usage of /  $countWarnings services in Warning state"

                exit 0

        elif ((6<=$countWarnings && $countWarnings<=9)); then

# This case makes no sense because it only adds one warning.

# It is just to make an example of all possible exits.

      echo "WARNING - Usage of / $countWarnings services in Warning state"

     exit 1

elif ((10<=$countWarnings && $countWarnings<=99)); then

       echo "CRITICAL - Usage of / $countWarnings services in Warning state"

       servername=nagios.example.com filesystem=/

        echo "$servername $filesystem"

     curl -D - \

      -X "POST" -H "Accept: application/json" \

     -H "Content-Type: application/json" \

     -H "X-Rundeck-Auth-Token: 8h7eFvQ1Nb5JrhulUdYrHvAKzwWw18gp" \

     -d "{\"argString\":\"-servername $servername -filesystem $filesystem \"}" \

     http://192.168.1.10:4440/api/16/job/2ed8d8c9-3f46-46d3-ba5f-e71d3211a40c/executions

      exit 2

    else

       echo "UNKNOWN - $countWarnings"

      exit 3

 fi

#chmod +x check_warnings.sh

Step 3 - Add Script to NRPE configuration on client host

#vi /etc/nagios/nrpe.cfg

log_facility=daemon

pid_file=/var/run/nrpe/nrpe.pid

server_port=5666

nrpe_user=nrpe

nrpe_group=nrpe

allowed_hosts=198.211.117.251

dont_blame_nrpe=1

debug=0

command_timeout=60

connection_timeout=300

include_dir=/etc/nrpe.d/

command[usedspace_bash]=/usr/lib64/nagios/plugins/usedspace.sh

#service nrpe restart 

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

#vi /usr/local/nagios/etc/objects/commands.cfg

# Custom plugins commands...

define command{

command_name check_warnings

command_line $USER1$/check_warnings.sh

}

#vi /usr/local/nagios/etc/server/jira.cfg

define service {

use generic-service

host_name jira.example.com

service_description Centos.Example.com Disk usage

check_command usedspace_bash

}

Restart Nagios:

#service nagios restart

Relevant Blogs:

Nagios threshold 

configuration Nagios adding Linux and windows nodes 

Terraform AWS Three Tier Application

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