Guys I'm testing nagios 3.0a and I'm thinking there is a notification bug. I have the following config: define timeperiod{ timeperiod_name 24x7 alias 24 Hours A Day, 7 Days A Week sunday 00:00-24:00 monday 00:00-24:00 tuesday 00:00-24:00 wednesday 00:00-24:00 thursday 00:00-24:00 friday 00:00-24:00 saturday 00:00-24:00 } define contact{ name generic-contact ; The name of this contact template service_notification_period 24x7 ; service notifications can be sent anytime host_notification_period 24x7 ; host notifications can be sent anytime service_notification_options w,u,c,r,f,s ; send notifications for all service states, flapping events, and scheduled downtime events host_notification_options d,u,r,f,s ; send notifications for all host states, flapping events, and scheduled downtime events service_notification_commands notify-service-by-email ; send service notifications via email host_notification_commands notify-host-by-email ; send host notifications via email register 0 ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL CONTACT, JUST A TEMPLATE! } define contact{ contact_name astuck use generic-contact alias SysAdmin1 email & nbsp; {my email} } define contactgroup{ contactgroup_name admins alias SysAdmins members astuck } define host{ name generic-host ; 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 failure_prediction_enabled 1 ; Failure prediction 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 notification_period 24x7 ; Send host notifications at any time register 0 ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL HOST, JUST A TEMPLATE! } define host{ name generic-linux use generic-host check_period 24x7 check_interval 5 retry_interval 1 max_check_attempts 10 check_command check-host-alive notification_interval 120 notification_options d,u,r register 0 } define host{ name nonprod use generic-linux contact_groups admins register 0 } define host{ use nonprod host_name lithium alias Oracle Dev 2 address lithium } As far as I see it I should get all host/service notification 24/7. However, when I reboot 'lithium' I get a host down notification but when it comes back I don't get anything. I turned on notification debugging : [1181695731.149796:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Wed Dec 31 16:00:00 1969 [1181695731.149852:032.0] Notification viability test passed. [1181695731.149861:032.1] Current notification number: 1 [1181695731.149867:032.2] Creating list of contacts to be notified. [1181695731.149873:032.1] Host notification will NOT be escalated. [1181695731.149879 :032.2] Adding contact 'astuck' to notification list. [1181695731.149985:032.2] ** Attempting to notifying contact 'astuck'... [1181695731.149994:032.2] ** Checking host notification viability for contact 'astuck'... [1181695731.150005:032.2] ** Host notification viability for contact 'astuck' PASSED. [1181695731.150014:032.2] ** Notifying contact 'astuck' [1181695731.150071:032.2] Raw Command: /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAddress: $HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | /bin/mail -s "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **" $CONTACTEMAIL$ [1181695731.150078:032.2] Processed Command: /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: PROBLEM\nHost: lithium\nState: DOWN\nAddress: lithium\nInfo: (No output returned from host check)\n\nDate/Time: Tue Jun 12 17:48:51 PDT 2007\n" | /bin/mail -s "** PROBLEM Host Alert: lithium is DOWN **" {my email} [1181695731.194505:032.0] No contacts were notified. Next possible notification time: Tue Jun 12 19:48:51 2007 [1181695731.194527:032.0] 1 contacts were notified.[1181695741.047809:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Tue Jun 12 17:48:51 2007 [1181695741.047834:032.1] Its not yet time to re-notify the contacts about this host problem... [1181695741.047843:032.1] Next acceptable notification time: Tue Jun 12 19:48:51 2007 [1181695741.047850:032.0] Notification viability test failed. No notification will be sent out. [1181695751.160027:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Tue Jun 12 17:48:51 2007 [1181695751.160058:032.1] Its not yet time to re-notify the contacts about this host problem... [1181695751.160068:032.1] Next acceptable notification time: Tue Jun 12 19:48:51 2007 [1181695751.160074:032.0] Notification viability test failed. No notification will be sent out. [1181695811.210449:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Tue Jun 12 17:48:51 2007 [1181695811.210479:032.1] Its not yet time to re-notify the contacts about this host problem... [1181695811.210489:032.1] Next acceptable notification time: Tue Jun 12 19:48:51 2007 [1181695811.210495:032.0] Notification viability test failed. No notification will be sent out. [1181695821.068538:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Tue Jun 12 17:48:51 2007 [1181695821.068569:032.1] Its not yet time to re-notify the contacts about this host problem... [1181695821.068580:032.1] Next acceptable notification time: Tue Jun 12 19:48:51 2007 [1181695821.068586:032.0] Notification viability test failed. No notification will be sent out. [1181695821.068895:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Tue Jun 12 17:48:51 2007 [1181695821.068915:032.1] Its not yet time to re-notify the contacts about this host problem... [1181695821.068924:032.1] Next acceptable notification time: Tue Jun 12 19:48:51 2007 [1181695821.068931:032.0] Notification viability test failed. No notification will be sent out. [1181695831.174383:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Tue Jun 12 17:48:51 2007 [1181695831.174418:032.1] Its not yet time to re-notify the contacts about this host problem... [1181695831.174427:032.1] Next acceptable notification time: Tue Jun 12 19:48:51 2007 [1181695831.174434:032.0] Notification viability test failed. No notification will be sent out. [1181695831.174731:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Tue Jun 12 17:48:51 2007 [1181695831.174745:032.1] Its not yet time to re-notify the contacts about this host problem... [1181695831.174754:032.1] Next acceptable notification time: Tue Jun 12 19:48:51 2007 [1181695831.174760:032.0] Notification viability test failed. No notification will be sent out. [1181695851.144314:032.0] ** Host Notification Attempt ** Host: 'lithium', Type: 0, Current State: 1, Last Notification: Tue Jun 12 17:48:51 2007 [1181695851.144338:032.1] Its not yet time to re-notify the contacts about this host problem... [1181695851.144347:032.1] Next acceptable notification time: Tue Jun 12 19:48:51 2007 [1181695851.144354:032.0] Notification viability test failed. No notification will be sent out. [1181696025.034559:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'DISK USAGE /tmp', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696025.034582:032.1] We shouldn't notify about this recovery. [1181696025.034589:032.0] Notification viability test failed. No notification will be sent out. [1181696031.130428:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'LOAD', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696031.130452:032.1] We shouldn't notify about this recovery. [1181696031.130460:032.0] Notification viability test failed. No notification will be sent out. [1181696031.131081:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'DISK USAGE /usr/local', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696031.131095:032.1] We shouldn't notify about this recovery. [1181696031.131102:032.0] Notification viability test failed. No notification will be sent out. [1181696111.052735:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'CFENVD', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696111.052759:032.1] We shouldn't notify about this recovery. [1181696111.052766:032.0] Notification viability test failed. No notification will be sent out. [1181696111.052971:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'PERC CONTROLLER', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696111.052984:032.1] We shouldn't notify about this recovery. [1181696111.052992:032.0] Notification viability test failed. No notification will be sent out. [1181696111.053334:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'CFEXECD', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696111.053348:032.1] We shouldn't notify about this recovery. [1181696111.053355:032.0] Notification viability test failed. No notification will be sent out. [1181696121.163710:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'MEM', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696121.163738:032.1] We shouldn't notify about this recovery. [1181696121.163746:032.0] Notification viability test failed. No notification will be sent out. [1181696121.163984:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'DISK USAGE /var', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696121.163998:032.1] We shouldn't notify about this recovery. [1181696121.164005:032.0] Notification viability test failed. No notification will be sent out. [1181696141.130999:032.0] ** Service Notification Attempt ** Host: 'lithium', Service: 'DISK USAGE /', Type: 0, Current State: 0, Last Notification: Wed Dec 31 16:00:00 1969 [1181696141.131023:032.1] We shouldn't notify about this recovery. [1181696141.131031:032.0] Notification viability test failed. No notification will be sent out. Clearly, nagios decided that I shouldn't get a host up notification. I just don't understand why. From the log files I'd say the following logic takes place : 1. Host goes down - service check fails 2. Nagios checks to see if host is down - YES 3. Because of step 2. no service notifications are sent 4. Host down notification is sent instead 5. Host comes back 6. Service checks start recovering - no service recovery notification is sent since no service problem notifications were sent in the first place. 7. Host is assumed to be up since service is up 8. Hence - no host up notification. First I thought my host up notification might not make it through one of the notification filters but according to the log there is NO HOST check after the reboot therefore there is no host notification attempt. Looks to me like a design bug but I wanna make sure I'm not getting this wrong. It just doesn't make sense to me that I wouldn't be notified about a host coming back. I understand the part about the services. INTERESTING: I have rebooted a few times and it appears that sometimes I do get host up notifications but most of the time I don't so it seems to have to do with when exactly the reboot occurs. Also, I turned off flapping globally but no difference. Anyone seen this behaviour ? -- stucky