Service http checks

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Service http checks

Postby anobles » Tue May 04, 2021 3:29 pm

Hey. I'm trying to setup notifications for the http service checks. They seem to work when i select send custom service notifications. They check http also works for Host and are sending notifications going that route. I noticed my https service checks only show they have completed 1 attempt until I restart nagios. I'm guessing this is the reason the notifications are not getting sent but I don't know the cause of it. As far as the logs they do not show anything after the first check has been submitted.
Server Object
Code: Select all
define host {
        use                        host
        host_name         Test3
        address                    <serveraddress>
   hostgroups         Server
}

define service {
   use          Server_HTTP
   host_name      Test3
}

Service.cfg
Code: Select all
define service{
        name                   Server_HTTP
        use         generic-service
   servicegroups           Managed_Servers
        max_check_attempts      2
        check_interval          5
        retry_interval          2
        check_command           check_http
        notification_period     24x7
        notification_interval   0
        service_description    HTTP
        contact_groups          admins
        register                0
}

template
Code: Select all
define service {

    name                            generic-service         ; The 'name' of this service template
    active_checks_enabled           1                       ; Active service checks are enabled
    passive_checks_enabled          1                       ; Passive service checks are enabled/accepted
    parallelize_check               1                       ; Active service checks should be parallelized (disabling this can lead to major performance problems)
    obsess_over_service             1                       ; We should obsess over this service (if necessary)
    check_freshness                 0                       ; Default is to NOT check service 'freshness'
    notifications_enabled           1                       ; Service notifications are enabled
    event_handler_enabled           1                       ; Service 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
    is_volatile                     0                       ; The service is not volatile
    check_period                    24x7                    ; The service can be checked at any time of the day
    max_check_attempts              3                       ; Re-check the service up to 3 times in order to determine its final (hard) state
    check_interval                  6                      ; Check the service every 6 minutes under normal conditions
    retry_interval                  2                       ; Re-check the service every two minutes until a hard state can be determined
    contact_groups                  admins                 ; Notifications get sent out to everyone in the 'admins' group
    notification_options            w,u,c,r                 ; Send notifications about warning, unknown, critical, and recovery events
    notification_interval           0                      ; Re-notify about service problems
    notification_period             24x7                    ; Notifications can be sent out at any time
    register                        0                       ; DON'T REGISTER THIS DEFINITION - ITS NOT A REAL SERVICE, JUST A TEMPLATE!
}
anobles
 
Posts: 3
Joined: Fri Nov 20, 2020 3:13 pm

Re: Service http checks

Postby benjaminsmith » Tue May 04, 2021 4:29 pm

Hi @anobles,

The nagios log will only show state changes, it's not going to log every single check. You can test this by watching the nagios log and sending passive check results.

Code: Select all
tail -f /usr/local/nagios/var/nagios.log

Make sure to check the contact group for the service (admins) for the right settings (notification handlers, notification options, time periods..etc). I would compare this against the host for differences.

By the way, searching through the objects.cache file is really helpful to view the entire object results once the various templates have been added.
Code: Select all
/usr/local/nagios/var/objects.cache

By the way, the following guide is very helpful for troubleshooting notifications (even though this is written for Nagios XI).

Nagios XI - Notification Problems

Cheers,
Benjamin
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benjaminsmith
 
Posts: 4634
Joined: Wed Aug 22, 2018 4:39 pm
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Re: Service http checks

Postby anobles » Thu May 06, 2021 4:36 pm

Hey Benjamin

when I was watching the logs using tail command, I could see the task get logged. On the first go around the check is logged then a few seconds later the results appear. After the first check, the result of the checks will no longer appear and the attempt counter never goes past 1

objects.cache
Code: Select all

define contactgroup {
   contactgroup_name   admins
   alias   Nagios Administrators
   members   me
   }

define contact {
   contact_name   me
   alias   me
   service_notification_period   24x7
   host_notification_period   24x7
   service_notification_options   r,w,u,c,f,s
   host_notification_options   r,d,u,f,s
   service_notification_commands   notify-service-by-email
   host_notification_commands   notify-support-by-email
   email   adamn@controlbynet.com
   minimum_importance   0
   host_notifications_enabled   1
   service_notifications_enabled   1
   can_submit_commands   1
   retain_status_information   1
   retain_nonstatus_information   1
   }

define service {
   host_name   Test10
   service_description   HTTP
   check_period   24x7
   check_command   check_http
   contact_groups   admins
   notification_period   24x7
   initial_state   o
   importance   0
   check_interval   5.000000
   retry_interval   2.000000
   max_check_attempts   2
   is_volatile   0
   parallelize_check   1
   active_checks_enabled   1
   passive_checks_enabled   1
   obsess   1
   event_handler_enabled   1
   low_flap_threshold   0.000000
   high_flap_threshold   0.000000
   flap_detection_enabled   1
   flap_detection_options   a
   freshness_threshold   0
   check_freshness   0
   notification_options   r,w,u,c
   notifications_enabled   1
   notification_interval   0.000000
   first_notification_delay   0.000000
   stalking_options   n
   process_perf_data   1
   retain_status_information   1
   retain_nonstatus_information   1
   }

define service {
   host_name   Test10
   service_description   ping
   check_period   24x7
   check_command   check_ping!100,20%!500,60%
   contact_groups   admins
   notification_period   24x7
   initial_state   o
   importance   0
   check_interval   6.000000
   retry_interval   2.000000
   max_check_attempts   3
   is_volatile   0
   parallelize_check   1
   active_checks_enabled   1
   passive_checks_enabled   1
   obsess   1
   event_handler_enabled   1
   low_flap_threshold   0.000000
   high_flap_threshold   0.000000
   flap_detection_enabled   1
   flap_detection_options   a
   freshness_threshold   0
   check_freshness   0
   notification_options   r,w,u,c
   notifications_enabled   1
   notification_interval   0.000000
   first_notification_delay   0.000000
   stalking_options   n
   process_perf_data   1
   retain_status_information   1
   retain_nonstatus_information   1
   }




This is one of the only two that send a notification. The other services stay frozen at the first attempt
Code: Select all
define service {
   host_name   Other_Server
   service_description   Ping
   check_period   24x7
   check_command   check_ping!100.0,20%!500.0,60%
   contact_groups   admins
   notification_period   24x7
   initial_state   o
   importance   0
   check_interval   6.000000
   retry_interval   2.000000
   max_check_attempts   3
   is_volatile   0
   parallelize_check   1
   active_checks_enabled   1
   passive_checks_enabled   1
   obsess   1
   event_handler_enabled   1
   low_flap_threshold   0.000000
   high_flap_threshold   0.000000
   flap_detection_enabled   1
   flap_detection_options   a
   freshness_threshold   0
   check_freshness   0
   notification_options   r,w,u,c
   notifications_enabled   1
   notification_interval   0.000000
   first_notification_delay   0.000000
   stalking_options   n
   process_perf_data   1
   retain_status_information   1
   retain_nonstatus_information   1
   }


Here is one of the host configs.
Code: Select all
define host {
   host_name   another_Server
   alias   Server
   address   another_Server
   check_command   check_http
   contact_groups   admins
   notification_period   24x7
   initial_state   o
   importance   0
   check_interval   5.000000
   retry_interval   2.000000
   max_check_attempts   2
   active_checks_enabled   1
   passive_checks_enabled   1
   obsess   1
   event_handler_enabled   1
   low_flap_threshold   0.000000
   high_flap_threshold   0.000000
   flap_detection_enabled   1
   flap_detection_options   a
   freshness_threshold   0
   check_freshness   0
   notification_options   a
   notifications_enabled   1
   notification_interval   0.000000
   first_notification_delay   0.000000
   stalking_options   n
   process_perf_data   1
   retain_status_information   1
   retain_nonstatus_information   1
   }


I compared the ping from "other server" with the services from test10 and don't see any difference. The send custom notification option still goes through for each service. I have the contact definition using the generic so all the options are checked. The time periods are set to 24x7 and the event handler is enabled. I was thinking it was probably a global setting but if that was the case the one ping from "other server" would not work like the rest.
anobles
 
Posts: 3
Joined: Fri Nov 20, 2020 3:13 pm

Re: Service http checks

Postby anobles » Thu May 06, 2021 4:38 pm

Sorry, I forgot to mention that I'm using Nagios core.
anobles
 
Posts: 3
Joined: Fri Nov 20, 2020 3:13 pm


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