How-to for working with Plugins

General
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Hello, I’m new to CheckMK, so I have a question that I’m sure seems simple to you. Where can I find a how-to on how to deal with plugins that I find in the GUI under Linux, Solaris, AIX files. I want to install the mk_apt plugin and I don’t know what to do with the txt file. Unfortunately I have not found any instructions on how to deal with these files.

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Read chapter 8 of Monitoring Linux - The new agent for Linux in detail

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Thank you very much, this article is worth its weight in gold. I have my installation on Docker, is it correct that the directory “/usr/lib/check_mk_agent/plugins” is then under “/var/lib/docker/overlay2/a-really-huge-number/diff/usr/lib/check_mk_agent/plugins” ?

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Do you have your Checkmk site in a Docker container? Or the system you want to monitor?

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It’s the Checkmk site. I did the Setup according to this → Installation as a Docker container

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Usually you do not need agent plugins within the Checkmk container.
But if you need them you can use docker cp to copy them into the container.

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I have now moved the file “mk_apt” to the right place (/usr/lib/check_mk_agent/plugins/3600), thanks for the help, but I don’t see any difference.
I try to set up APT like in this video here → https://www.youtube.com/watch?v=KGFpXPXPc1U. I never see the point “APT normal and security updates (Linux)” and I can’t find a hint if this works at all in the RAW edition.
“Alternatively” I have set up ‘APT Updates’ under ‘Service monitoring rules’ and ‘Enforced Services’. However, the APT Updates service always remains pending and the Check_MK service says “Missing monitoring data for plugins, apt”.

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Is the file executable (chmod +x mk_apt)?

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-rwxr-xr-x 1 cmk cmk 1383 Oct 31 14:32 mk_apt, looks OK for me

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I think I got it now…
It works on Debian and Ubuntu. You need to deploy the plugin mk_apt in order for the check to work. It is recommended to install this plug-in with asynchronous execution and at an interval with at least one hour.
I once understood that it must be available on the host on which the check is to be made and now it works…
Many thanks for the help

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