On Thu, Dec 20, 2018 at 03:38:01PM +0100, Didier Kryn wrote:
> Le 20/12/2018 à 15:32, Arnt Karlsen a écrit :
> > On Thu, 20 Dec 2018 00:59:35 +1100, Ralph wrote in message
> > <c8fde44f-6df4-4e28-08a5-059b978878de@???>:
> >
> > > There is this notion of "kexec boot"; I've never tried it, but it's
> > > documentation claims "kexec is a system call that enables you to
> > > load and boot into another kernel from the currently running kernel."
> > >
> > > Maybe it comes with too many ifs and buts to be a viable approach.
> > >
> > > Ralph.
> > ..I used to "kexec reboot" a lot in my pre-systemd Debian days,
> > AFAIR, bought me nice long uptimes with new kernels. ;o)
> >
>     What's the purpose of kexec ? I see one main: using a Linux session as
> the bootloader, a bootloader more heavily customizable than Grub.
> Additionally it saves a few seconds. Are there any other ?

Post-mortem on a crashed system: the second kernel can access the whole
memory, etc.

It can also bring you some "fun" when it turns out the machine can't boot
from a cold start.


Meow!
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