[Nagiosplug-help] Nagios SCHEDULE_FORCED_HOST_CHECK not running

Rob Felsburg rfelsburg at gmail.com
Tue Jul 20 19:28:45 CEST 2010

In nagios, when I force a host check, I can clearly see in the logs:

[1279640879] EXTERNAL COMMAND:

However it never actually runs the check-host-alive check, which is check_ping.

It doesn't appear in the scheduling queue, and even though the host in
not pingable, and running the command itself fails it still shows as
being up.

/usr/local/nagios/libexec/check_ping -H random-host.domain.org -w
3000.0,80% -c 5000.0,100% -p 1

CRITICAL - Host Unreachable (random-host.domain.org)

Host Status:          UP
Status Information:         PING OK - Packet loss = 0%, RTA = 1.10 ms
Performance Data:
Current Attempt:             1/10
State Type:         HARD
Last Check Type:              ACTIVE
Last Check Time:              07-19-2010 16:02:03
Status Data Age:               0d 0h 0m 30s
Next Scheduled Active Check:  N/A
Latency:               0.000 seconds
Check Duration:                0.053 seconds
Last State Change:           04-01-2009 15:58:50
Current State Duration: 474d 0h 3m 43s
Last Host Notification:    N/A
Current Notification Number:    0
Is This Host Flapping?       NO
Percent State Change:   0.00%
In Scheduled Downtime?               NO
Last Update:      07-19-2010 16:02:25

I can grep back through my archive logs, and see where hosts have been
reported down however the above host was down for almost 30 minutes
and we still received no alert:

HOST ALERT: some-other-random-host.org;DOWN;SOFT;1;CRITICAL - Host
Unreachable (some-other-random-host.org)

My host and check-host-alive settings are:

    define host{
    name                            linuxprod-server
    use                             generic-host
    check_period                    24x7
    max_check_attempts              10
    check_command                   check-host-alive
    notification_period             24x7
    notification_interval           120
    notification_options            d,u,r
    contact_groups                  linux admins
    register                        0

and check-host-alive is defined here:

# 'check-host-alive' command definition
    define command{
            command_name    check-host-alive
            command_line    $USER1$/check_ping -H $HOSTALIAS$ -w
3000.0,80% -c 5000.0,100% -p 1


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