Nagios reporting host down but its not?

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Nagios reporting host down but its not?

Postby Alan » Thu Feb 13, 2020 11:04 am

I have been getting a few issues with Nagios sending an email saying a server is down but it actually is not. I am able to login to it. I am thinking this may have to do with my configuration but I am not sure. I am using ncpa.cfg and I have a Ping service setup there I am pretty sure it was just the default which is:
Code: Select all
define service {
    host_name               Svr-Data
    service_description     Ping
    check_command           check_ping!60.0,5%!100.0,10%
    max_check_attempts      5
    check_interval          5
    retry_interval          1
    check_period            24x7
    notification_interval   60
    notification_period     24x7
    contact_groups          admins2
    register                1
}

I did find a form and someone suggested to look at the command.cfg file and said it should look like this:
Code: Select all
define command{
command_name check-host-alive
command_line $USER1$/check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5
}

This is exactly how mine looks. I don't know if i need to change any values in one or both of these spots?

I have also been seeing some weird issues in the Nagios UI that is basically saying the status is down but all the services are ok. I have seen this several times and tired reloading the Nagios service and the httpd service but it does not seem to fix it. This does eventually go away on its own and change to status up but it sometimes takes a day or so.
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Saying down when it is not.png
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Re: Nagios reporting host down but its not?

Postby scottwilkerson » Thu Feb 13, 2020 1:28 pm

You show the configuration for a service, but what is the configuration for the host? it is the check_command for the host definition that will determine if it is marked down
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Re: Nagios reporting host down but its not?

Postby Alan » Fri Feb 14, 2020 12:08 pm

Here is the host setting.
Code: Select all
define host {
    host_name               Svr-Data
    address                 172.16.10.4
    hostgroups              VMs, physical_VMs
    check_command           check_ncpa!-t 'PublicS' -P 5693 -M system/agent_version
    max_check_attempts      5
    check_interval          5
    retry_interval          1
    check_period            24x7
    contact_groups          admins2, calls
    notification_interval   60
    notification_period     24x7
    notifications_enabled   1
    notification_options    d,u,r
    icon_image              ncpa.png
    statusmap_image         ncpa.png
    register                1
}


Is this what you are wanting?
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Re: Nagios reporting host down but its not?

Postby scottwilkerson » Fri Feb 14, 2020 12:21 pm

Alan wrote:Is this what you are wanting?


Yes, and the Svr-Data shows down in the UI?

What is the output shown on the host status page?
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Re: Nagios reporting host down but its not?

Postby Alan » Fri Feb 14, 2020 1:28 pm

This is the Svr-data Nagios UI
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Svr-Data.png
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Re: Nagios reporting host down but its not?

Postby scottwilkerson » Fri Feb 14, 2020 2:20 pm

Click on Svr-Data under the host column to see the host status detail page
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