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If I have something so important that it has to run for over a decade that I cannot risk doing an OS upgrade, then I don't see why I shouldn't need to pay for that, assuming the fee is reasonable.

It is also very easy, to take Debian 12, install Docker or Podman on it and just put everything into containers, that way the only thing that you need to work after an upgrade is your container runtime and you are all set.

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Yeah now instead of updating one (host) OS I have to update X container OS/user spaces plus the host users pace plus the shared kernel. I think I will pass on this szenario for long term support.

You don't manually update the container images, you ideally pull it from the vendor, who knows best what is needed to get it working, it's also less hassle even if you build the images, because the image only contains the components that are needed to run than application, it doesn't contain things that are needed for your other applications.

If you are able to run multiple applications on one host, you are likely doing the things that containers do for you.

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