<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7654.12"> <TITLE>host check strangeness - odd behavior in Nagios scheduling queue</TITLE> </HEAD> <BODY>  Greetings All, I'm seeing a problem with our host check scheduling. There are two major issues, I can't tell if they are symptoms of the same problem or two separate issues. I've provided the configs and information that I know to be applicable, if there's other pertinent information please let me know, I'm more than happy to provide it. First Here's my Nagios config: Single Nagios box (no distributed setup) 64-bit RHEL 5.3 Nagios 3.1.2 (I upgraded from 3.0.6 to see if that would fix the issues) Problem 1. Some host checks are getting *stuck* in scheduling queue. When I look at the scheduling queue these hosts are always listed with the 'last check' time the same as it's 'next check' time. See attached screen shot (problem 1). They typically stay at the top of the queue for an hour or two. Host configuration for one of them: define host { host_name hostxxx alias Oracle use srvhost-os-2000,srvhost-physical,srvhost-oracle,srvhost-non-production,srvhost-all notification_period aperture register 1 } Applicable Templates: define host { name generic-host check_period 24x7 event_handler_enabled 1 flap_detection_enabled 1 process_perf_data 1 retain_status_information 1 retain_nonstatus_information 1 notifications_enabled 1 register 0 } define host { name generic-pnp action_url /pnp/index.php?host=$HOSTNAME$' onmouseover="get_g('$HOSTNAME$','_HOST_')" onmouseout="clear_g()" register 0 } define host { name srvhost-all alias All Servers check_command check-nt-alive use generic-pnp,generic-host max_check_attempts 3 check_interval 60 retry_interval 1 active_checks_enabled 1 passive_checks_enabled 1 flap_detection_enabled 1 process_perf_data 1 retain_status_information 1 retain_nonstatus_information 1 contact_groups +servers notification_interval 240 notification_period 24x7 notification_options d,u,r notifications_enabled 1 register 0 } define host { name srvhost-non-production alias Non production servers hostgroups +SRV_Cls-non-production check_interval 120 retry_interval 20 passive_checks_enabled 1 contact_groups +servers notification_interval 480 notification_period workhours notification_options d,u,r notifications_enabled 1 register 0 } define host { name srvhost-oracle alias Oracle servers hostgroups +SRV_app-oracle contact_groups +oracle register 0 } define host { name srvhost-physical alias Servers that are running on physical hardware hostgroups +SRV_platform-physical register 0 } define host { name srvhost-os-2000 alias Servers running Windows 2000 Server hostgroups +SRV_os-win2000 check_command check-nt-alive register 0 } Problem 2. Many of our hosts are not running host checks, they are in the scheduling queue but don't execute. Looking at the scheduling queue I can see many of the hosts that have host 'last check' times from several weeks ago. They show up in the queue but never run their host checks (or don't seem to). These same hosts run service checks on time without issue. Screen shot attached (problem 2). Host config for one of the hosts not running host checks: define host { host_name hostxxxx alias media server use srvhost-production,srvhost-physical,srvhost-os-2003,srvhost-all register 1 } define host { name generic-host check_period 24x7 event_handler_enabled 1 flap_detection_enabled 1 process_perf_data 1 retain_status_information 1 retain_nonstatus_information 1 notifications_enabled 1 register 0 } define host { name generic-pnp action_url /pnp/index.php?host=$HOSTNAME$' onmouseover="get_g('$HOSTNAME$','_HOST_')" onmouseout="clear_g()" register 0 } define host { name srvhost-all alias All Servers check_command check-nt-alive use generic-pnp,generic-host max_check_attempts 3 check_interval 60 retry_interval 1 active_checks_enabled 1 passive_checks_enabled 1 flap_detection_enabled 1 process_perf_data 1 retain_status_information 1 retain_nonstatus_information 1 contact_groups +servers notification_interval 240 notification_period 24x7 notification_options d,u,r notifications_enabled 1 register 0 } define host { name srvhost-os-2003 alias Servers running Windows 2003 hostgroups +SRV_os-win2003 check_command check-nt-alive register 0 } define host { name srvhost-physical alias Servers that are running on physical hardware hostgroups +SRV_platform-physical register 0 } define host { name srvhost-production alias All servers in production mode hostgroups +SRV_Cls-production contact_groups +helpdesk,servers,servers-off-hours,thesolver register 0 } define command { command_name check-nt-alive command_line $USER1$/check_tcp -H $HOSTADDRESS$ -p 135 -t 30 } Any ideas or help is tracking this down is appreciated. I'm pretty sure it's a bug in the code, but I suppose it's possible my configuration is off somehow. :-) Thanks Again, -greg </BODY> </HTML>