2.6. Set Hosts

Open /etc/nagios/objects/hadoop-hosts.cfg with a text editor.

Create a "define host { … }" entry for each host in your cluster using the following format:

define host {
       alias @HOST@
       host_name @HOST@
       use linux-server
       address @HOST@
       check_interval 0.25
       retry_interval 0.25
       max_check_attempts 4
       notifications_enabled 1
       first_notification_delay 0 # Send notification soon after
                                   change in the hard state
       notification_interval 0    # Send the notification once
       notification_options       d,u,r
  }

Replace the "@HOST@" with the hostname.