openssh configuration and substitute server list

[Yuchen Pei]

Hello,

I just installed guix system for the first time, and it was on a 
vps. I have two questions:

1. Is there a way to configure openssh without doing irrelevant 
stuff? I wanted to disable password login, and here's what I did:
  1. use `guix system describe` to get the current config file
  2. copy the config file somewhere and open it
  3. add one line inside openssh-configuration 
  (password-authentication? #f)
  4. run `guix system reconfigure` on the file
  It took 1m13s, downloading 52MB packages (guix, guix-artwork, 
  locale,...), applying numerous grafts and building numerous 
  drvs.
2. All the packages have been downloaded from ci.guix.gnu.org, 
which is not very fast sometimes as the vps is located in 
Australia. "Normal" popular GNU/Linux distros often come with an 
official list of mirrors. Is there something similar for guix, 
i.e. an official list of substitute servers somewhere?

Thanks!

Best,
Yuchen

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