Hi Maxim,

I'm not really familiar with the OVH rescue mode. But a quick search
showed up this:

https://support.us.ovhcloud.com/hc/en-us/articles/20041782509203-Activating-Rescue-Mode-on-a-Public-Cloud-Instance
https://eu.api.ovh.com/console/?section=%2Fcloud&branch=v1#post-/cloud/project/-serviceName-/instance/-instanceId-/rescueMode

So, if it works similar to the Hetzner rescue system, which I think it
does, and you can install guix on it (the package manager is enough) I
don't see why this approach should not work there as well.

Thanks, Roman

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Hi Roman,
>
> Roman Scherer <roman@burningswell.com> writes:
>
>> Hi Maxim,
>>
>> yes, it is fully automated. What happens is:
>>
>> - a server is provisioned through the Hetzner API
>> - the the server is booted into the rescue system via the API
>> - partitions are setup in the rescue system (enlarged)
>> - a minimal Guix system is installed
>> - then the server re-booted, starting the minimal Guix system
>> - then the machine-ssh-environment takes over and applies the final system configuration
>> - this all is done once, when the server is initially provisioned
>>
>> Previsouly I tried the guix-infect.sh approach that installs a Guix
>> system on top of a debian/ubuntu image, but I found this was very
>> brittle (issues with dns when you remove /etc, etc.). From my experience
>> working with this I found the approach with the rescue system both more
>> reliable and faster.
>>
>> Does this mnake sense?
>
> Thanks for the clear explanation, it makes a lot of sense and it's
> awesome that you could automate all that!  It looks a lot like the
> manual steps I had to go through to install Guix System on a cheap OVH
> VPS [0].  It'd be fun to review if their API would allow automating all
> that as what you did here for Hetzner.  The nice thing with OVH is that
> they do not place any upper limit on the amount of bandwidth consumed
> (no extra billing), and it's quite inexpensive (I currently pay less
> than 2 CAD/month, although that's only for the first year -- after it's
> similar to Hetzner, about 6 CAD/month IIRC).
>
> [0]  https://lists.gnu.org/archive/html/help-guix/2024-08/msg00125.html