Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.user > #227870

Re: Stretch => Buster: Entropy during boot

Show all headers | View raw

Hi Jesper,

On Fri, Oct 16, 2020 at 12:28:13PM +0200, Jesper Dybdal wrote:
> I run a few Stretch systems on old processors that do not support the RDRAND
> instruction.
> 
> Can I simply install "haveged" on the Stretch systems *before* the upgrade
> to Buster to avoid problems during the upgrade?

In July last year I experimented with boot times on a virtual
machine while:

- running normally

- disallowing RDRAND for early entropy

- disallowing RDRAND entirely

The normal boot (RDRAND) took ~1 second; the "no RDRAND at all" boot
took ~49 seconds. Given that a virtual machine has no real hardware
to provide sources of entropy I would consider this to be near to a
worst case for SSH. If you have other boot-time services that
require entropy then they may take significantly longer.

So if it's mainly SSH you're worried about, I don't think this will
be the end of the world for you to just do it and see what happens.

    https://strugglers.net/~andy/blog/2019/07/11/experiments-with-rdrand-and-entropykey/

Cheers,
Andy

-- 
https://bitfolk.com/ -- No-nonsense VPS hosting

Back to linux.debian.user | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Stretch => Buster: Entropy during boot Jesper Dybdal <jd-debian-user@dybdal.dk> - 2020-10-16 12:30 +0200
  Re: Stretch => Buster: Entropy during boot Reco <recoverym4n@enotuniq.net> - 2020-10-16 12:40 +0200
  Re: Stretch => Buster: Entropy during boot Andrei POPESCU <andreimpopescu@gmail.com> - 2020-10-16 14:50 +0200
    Re: Stretch => Buster: Entropy during boot Reco <recoverym4n@enotuniq.net> - 2020-10-16 15:40 +0200
  Re: Stretch => Buster: Entropy during boot Andy Smith <andy@strugglers.net> - 2020-10-16 16:50 +0200

csiph-web