On 12/19/2016 11:25 AM, Daniel P. Berrange wrote:
On Mon, Dec 19, 2016 at 11:19:06AM +0100, Florian Weimer wrote:
Do we need to support running current Fedora releases in kernels which are
older than the initial Fedora kernel for that release?
That is important if we wish to allow a Fedora container of version X
to be run on a host with Fedora version X-N, for some N. Or equivalently
allow a Fedora version X to run as a container on a non-Fedora host (Ubuntu/
RHEL/Debian/whatever) since they'll almost certainly have a different kernel
version to what Fedora initially ships and that can't be assumed to be newer.
But this equivalence does not exist because Fedora quite aggressively
updates kernel releases in maintained releases. The other distributions
you listed do not do this.
If yes, what are the kernel baselines? We can go back to releases earlier
than 3.2 on most architectures because that's the current glibc baseline
(except x86_64 and i386, where the glibc baseline is 2.6.32).
To maximise container compatibility, we'd want to be quite conservative
in kernel baseline version.
Is there any evidence we actually care about this? Like still
supporting an *unpatched* 2.6.32 kernel on x86_64? I don't think we
have a lot of test coverage for this.
Thanks,
Florian
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