http://linuxexchange.org/questions/1108/nagios-schedule_forced_host_check-not-running<p>In nagios, when I force a host check, I can clearly see in the logs:</p> <pre><code>[1279640879] EXTERNAL COMMAND: SCHEDULE_FORCED_HOST_CHECK;random-host.domain.org;1279640878 </code></pre> <p>However it never actually runs the check-host-alive check, which is check_ping.</p> <p>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.</p> <pre><code>/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 </code></pre> <p>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:</p> <pre><code>HOST ALERT: some-other-random-host.org;DOWN;SOFT;1;CRITICAL - Host Unreachable (some-other-random-host.org) </code></pre> <p>My host and check-host-alive settings are:</p> <pre><code>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 } </code></pre> <p>and check-host-alive is defined here:</p> <pre><code># '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 } </code></pre> <p>Thoughts?</p>enWed, 21 Jul 2010 13:55:10 -0400http://linuxexchange.org/questions/1108/nagios-schedule_forced_host_check-not-running/1116<p>The CATCH is it doesn't look like its running, because it turns out nagios only logs failed checks unless you tell it to --enable-DEBUG3 at build time.</p> <p>Took me a couple of days of sorting through to realize that I was only seeing SERVICE ALERT in log files.</p> <p>Still haven't figured out why it was reporting as up, but I'll get to that next.</p>rfelsburgWed, 21 Jul 2010 13:55:10 -0400http://linuxexchange.org/questions/1108/nagios-schedule_forced_host_check-not-running/1116