I don't have an opinion on whether this should be done on Debian servers or not, but I have a comment on providing security support for more than a decade. How do you plan to deal with the kernel? Do you expect to backport security fixes to the wheezy kernel, or upgrade the kernel to newer versions from time to time? A newer kernel may be necessary for hardware support as well. What's your plan on that? In addition to the kernel, the rest of the plumbing layer may need upgrades to handle hardware support, security, changes elsewhere. I wouldn't want to put a device with Linux kernel from the 2.2 era (2013) on the Internet anymore. I wouldn't want to put a device with 4.15.4 in 2033. Personally, I don't find backporting kernel and plumbing changes for over a decade to be a viable approach. I find planning to upgrade software on the devices is the way to go. On the other hand, I'm no longer working on things expected to last 25 years, though I did do that in a previous job. While I'm sceptical, Ḯ'm not saying that it can't be done, so I'm not objecting. Instead, I'm asking, what your plans for this are?
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