On 11/02/2012 07:04 PM, Adam Williamson wrote:
Sure, like I said in another mail, we've got better at that than before. But as I also said in the same mail, you still have to do a version upgrade every twelve months. That alone is ridiculous for a 'stable' operating system.
This is an important point---it makes it difficult to deploy Fedora for other people. When the end-of-support comes, it usually means having to reinstall, because upgrade can take unbounded time, if problems pop up. Additionally, in my experience, a reinstall often results in a better configuration, free of grandfathered suboptimal settings.
I keep thinking about a scheme to roll over an EOL Fedora into a closest possible CENTOS. It's not trivial because I can't just look for the CENTOS that matches the original Fedora release, because of the subsequent updates. It would have to look at the as-is system and try to figure out the best matching CENTOS release. I am thinking about a sum-of-squared-differences-like distance metric: calculate sum over all packages of (installed_version - CENTOS_X_version)^2, for several CENTOS_X versions, and chose the one giving the smallest value. Of course some packages (glibc, kernel) would have a higher weight, but that could be incorporated (\sum_i((v1_i-v2_i)^2/wght_i)).
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