Nagios – Check Host without Ping

As my previous post about Firewall(iptables) on servers, I like to disable PING(ICMP) on my server.

But Nagios will mark them as [Down] when you using Nagios to monitor the server.

Solution:

If it is web hosting server, means HTTP is public accessible.

I do this on my Nagios 4.0.5 build:

/usr/local/nagios/etc/objects/templates.cfg

# NO PING web host
define host{
        name                            generic-noping-webhost    ; The name of this host template
        notifications_enabled           1               ; Host notifications are enabled
        event_handler_enabled           1               ; Host event handler is enabled
        flap_detection_enabled          1               ; Flap detection is enabled
        process_perf_data               1               ; Process performance data
        retain_status_information       1               ; Retain status information across program restarts
        retain_nonstatus_information    1               ; Retain non-status information across program restarts
        check_command                   check_http      ;
        max_check_attempts              10              ; Check each server 10 times (max)
        notification_interval           30              ; Resend notifications every 30 minutes
        notification_period             24x7            ; Send host notifications at any time
        notification_options            d,u,r           ; Only send notifications for specific host states
        contact_groups                  admins          ; Notifications get sent to the admins by default
        register                        0               ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL HOST, JUST A TEMPLATE!
        }

Then in the hosts.cfg define add:

define host{
        use                     generic-noping-webhost
        host_name               bpt-milliondollarserver
        alias                   bpt-milliondollarserver
        address                 
        }

Just in case your server doesn't event have HTTP service.
Try:

check_command                   check_dummy      ;

And define check_dump in commands.cfg

check_command                   check_tcp_port_1234;

Add define check_tcp -p 80 in commands.cfg

Replace:

check_command                   check_http      ;