Nagios check_dns plugin support of querytype

General
1

I am wondering if it is possible to request to update the current Nagios Plugin ‘check_dns’ that comes with CheckMK installation.

# /omd/sites/corpnms/lib/nagios/plugins/check_dns -V
check_dns v2.3 (monitoring-plugins 2.3)

I have a use case to use the ‘querytype’ parameter for a check which looks to be available in
v2.3.3 on the nagios plugins site.

If the plugin was updated and incorporated the additional available option (-q, --querytype) in the web UI, it would avoid doing some customization.

As an alternative, I’m guessing I should be able to download that plugin, compile it and move it to the appropriate plugin folder on the checkmk server with an alternate name such as check_dns_type. Once located there I can leverage the rule ‘Integrate Nagios plugins’ to apply to this new check with the additional options.

Just making sure it’s as simple as I think it is but the update option would be preferred.

Thank you in advance for the help and reading,
Scotsie

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Visibility for check_dns Ideas Portal suggestion
2

You can always put a newer version into $OMD_ROOT/local/lib/nagios/plugins. This should then get picked up by the configuration.

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3

That’s what I first wanted to suggest as well. But then you still don’t have input fields in the setup rule form for the new options.

As a workaround, the updated local plugin can be included with “Setup > Services > Other services > Integrate Nagios plugins” where the full command line including any required options can be given.

2 Likes
4

Thanks, that was my assumption. After posting this I decided to to try it out on a temporary Checkmk server which worked.

  1. Downloaded the plugin from the site link above to a test CentOS server (same version/build as CheckMK) to avoid file conflicts.
  2. Followed the instructions for extracting and compiling.
  3. Copied the compiled plugin to the test checkmk $OMD_ROOT path, which in my case is:
    /omd/sites/corpnms/local/lib/nagios/plugins/check_dns_type
  4. In the CheckMK WebUI, created a new rule under ‘Integrate Nagios plugins’ with the syntax:
    check_dns_type -H <domain> -s $HOSTADDRESS$ -q MX -w 2 -c 3 -t 60 -a '10 mx1.<domain>.,20 mx2.<domain>.'

When it worked I repeated this on our production checkmk server.

As a side note, I tried supplying the -a ‘expected answers’ parameter with 2 entries but had to combine it.
With this setup:
`check_dns_type -H example.com -s $HOSTADDRESS$ -q MX -w 2 -c 3 -t 60 -a ‘10 mx1.example.com.’ -a ‘20 mx2.example.com.’
Something, either the plugin or checkmk, inserted a semicolon between responses which caused it to flag as a mismatch in the actual check.

Hope this helps the next person.

Scotsie

5

Please do not put anything under /omd/versions yourself. You will lose it after an update. Any extension has to be put under $OMD_ROOT/local of your site.

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7

Thank you, I have moved the file to this path and updated my steps above.

8

With the “Integrate Nagios plugins” Rule you can run all Nagios Plungin like you would on the commandline.

In this case you could place your version of the plugin with a diffrent name like check_dns_223 in $OMD_ROOT/local/lib/nagios/plugins and than use the “Integrate Nagios plugins” Rule to execute the Plugin with the Arguments you need.

9

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