Nagios master configuration

As discussed in earlier chapters, Nagios is a monitoring platform and works very well for the Hadoop monitoring needs. Let's see how to configure Nagios for Hadoop service checks.

On the Nagios server, called mnode, we need to set up service definitions, command definitions, and the host definition. All these plugins are available at the Nagios website and can be downloaded from there.

• JobTracker health check: This is used to check the JobTracker status:

  define command{
    command_name check_jobtracker_health
    command_line $PATH$/check_hadoop_mapreduce_nodes.pl -H $HOSTADDRESS$ -P $PORT$
  }
  
  define host {
    
    use hadoop-server
    host_name jt1
    alias Remote
    Host address 192.168.0.1
    contact_groups admins
  }
  Service definition:
  
  define service {
    
    use generic-service
    service_description jobtracker
    contact_groups admins
    
    check_command check_jobtracker_health
  }

  Note

  For further information, refer to

  http://exchange.nagios.org/directory/Plugins/Clustering...