Re: [gentoo-user] Linode discontinuing Xen, migrating to KVM

[R0b0t1]

On Tue, Oct 3, 2017 at 6:38 AM, Tanstaafl <tanstaafl@×××××××××××.org> wrote:
> On 10/2/2017, 11:52:21 PM, R0b0t1 <r030t1@×××××.com> wrote:
>> As long as your kernel has the appropriate drivers (i.e. you didn't
>> include only the virtualized Xen drivers and left most of the default
>> options intact) it should boot under QEMU/KVM or even on a bare metal
>> system.
>
> Hmmm, something else I just remembered when I noticed my production
> server is running a 32 bit kernel...
>
> A long time ago, maybe 6 or 7 years, something weird happened when
> Linode had some kind of problem (maybe it was another one of their
> maintenance processes, I don't recall), I had a heck of a time getting
> it back up, I finally had to do a full rebuild, and distinctly remember
> changing to a 32 bit kernel during the process, but never changed back.
>
> Do I need to do a full system rebuild to change back to the 64 bit kernel?
>

It shouldn't matter. The virtual processor (just like a real one)
starts up in 16 bit mode and is then set to 32 and then 64 bit mode by
software.

> Also, I haven't played with Linodes 'System Profiles' at all - I was
> thinking I'd just create a new profile, add my Gentoo System Image and a
> swap image to it, but assign the 64 bit kernel, then if it doesn't work,
> switch back. Should I be able to do that without causing any problems to
> the current/working profile?
>

I probably wouldn't use the Linode supplied configurations either, but
it might be a good idea to run diff on yours and theirs to see what
options are different.

R0b0t1.