Part2 :BigData Cluster Monitoring (Ganglia Metric configuration with Nagios)

Ganglia Metric configuration with Nagios

In order to set up ganglia metrics with nagios,do the following steps;

1. Download the Ganglia Metrics script (https://github.com/ganglia/ganglia-web/wiki/Nagios-Integration).Note the script requires PHP CLI binary

To test invoke PHP from the command line e.g. php --version or php5 --version. If you get something back you are good to go. Otherwise

Under Ubuntu install using apt-get:

sudo apt-get install php5-cli

2. You have to have Ganglia Web package installed and you have to configure it (conf.php) so that it pulls data off a server that aggregates data off of servers you want to monitor. By default Ganglia Web connects to localhost. Default local for ganglia-webfrontend on Ubuntu is /usr/share/ganglia-web-frontend.

Change following variables if your set up is different

sudo vi conf.php

$ganglia_ip = "127.0.0.1";

$ganglia_port = 8652;

3. Once you have Ganglia Web installed adjust the path in the check_ganglia_metric.php script to point to it e.g. it defaults to

$GANGLIA_WEB="/usr/share/ganglia-webfrontend" {for Ubuntu}

4. Now execute the script you downloaded above ie. php check_ganglia_metric.php. You should see

  Usage:  check_ganglia_metric.phps <hostname> <metric> <less|more|equal|notequal> <critical_value> ie.

5) At this point try to run an actual test e.g.

    check_ganglia_metric.php localhost disk_free less 10

If that succeeded you are now ready to configure Nagios

6) Now configure the Nagios Plugin config file

sudo vi /etc/nagios-plugins/config/ganglia.cfg

Add the following

# check Ganglia metrics

define command {

command_name check_ganglia

command_line /usr/lib/nagios/plugins/config/check_ganglia_metric.php localhost $ARG1$ $ARG2$ $ARG3$

}

7) Now you can use it in a service check. For instance say you want to be alerted if 1-minute load average went over 5 you would add following directive

define service{

use  generic-service         ; Name of service template to use

host_name                       localhost

service_description             Ganglia Checking

check_command                    check_ganglia!load_one!more|5

        }

   

8) Restart Nagios server.

9) Now click on the Ganglia-Checking service from Nagios webUI