Certain Hostgroups not working after Upgrade

[brianbelden]

All,

We recently upgraded our system which we ran Nagios3 on from Debian 7.11 to Debian 9.9. I know that Nagios3 is not supported in Debian 9, so I have to use Icinga instead. But Icinga is a drop in replacement of Nagios3. I have gone through this a couple time with different Monitoring servers we have, but this one is creating some strange issues.

In /etc/icinga/servers we have configuration files for many websites in our environment that are being check via DNS checks.

The services_icinga.cfg file has some lines of config like the ones below:

Code: Select all

define service {
        hostgroup_name                  DNS-google
        service_description             DNS-google
        servicegroups                   DNS-google
        check_command                   check_dns_google
        use                             generic-service
        check_interval                  15
        notification_interval           0 ; set > 0 if you want to be renotified
}

define service {
        hostgroup_name                  smtp-servers
        service_description             SMTP
        servicegroups                   SMTP
        check_command                   check_smtp
        use                             generic-service
        notification_interval           0; set > 0 if you want to be renotified
}

The servicegroups_nagios3.cfg file has the following config:

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define servicegroup {
        servicegroup_name       DNS-google
        alias                   DNS-google
        }
define servicegroup {
        servicegroup_name       SMTP
        alias                   SMTP
        }

Our generic-service_icinga.cfg is the following:

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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
        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_interval           0               ; Only send notifications on status change by default.
                is_volatile                     0
                check_period                    24x7
                normal_check_interval           5
                retry_check_interval            1
                max_check_attempts              4
                notification_period             24x7
                notification_options            w,u,c,r
                contact_groups                  admins
        register                        0       ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL SERVICE, JUST A TEMPLATE!
        }

In our hostgroups_icinga.cfg the following code is present:

Code: Select all

define hostgroup {
        hostgroup_name smtp-servers
                alias           SMTP servers
                members         aspmx.l.google.com
        }

define hostgroup {
        hostgroup_name  DNS-google
                alias           DNS
                members         demo.cloud9ortho.com
        }

When I try to run the command from the command line I get the following output:

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 /usr/lib/nagios/plugins/check_dns -s 8.8.8.8 -H demo.cloud9ortho.com -a 209.10.146.119
DNS OK: 0.025 seconds response time. demo.cloud9ortho.com returns 209.10.146.119|time=0.024592s;;;0.000000

I cannot figure out why the SMTP hostgroup is working but the one checking DNS is not working at all. If I log into the Web interface for Icinga I see the hostgroup for DNS but it is empty without any checks. The hostgroup for SMTP is showing up and checking fine. I am not sure what is wrong here.

Thank you

[brianbelden]

False alarm I fixed my own issue.

So what happened was another user removed an entry from /etc/icinga/servers/blank.cloud9ortho.com.cfg, but they did not remove the associated hostgroups_icinga.cfg config for DNS checks. This apparently cause it to not work.

[benjaminsmith]

Hi Brian,

Thanks for the update. We'll close this out. Also, just to let you know, we do support Debian 8/9 on Nagios Core and Nagios XI.

https://support.nagios.com/kb/article.php?id=12