3 wk. ago • 90%

Silverblue or other immutable on remote VPS?

Does anyone know of a hosting service that offers Silverblue as a possible choice for OS?

It seems to me that for a server running only docker services the greatly reduced attack surface of an immutable distro presents a definitive advantage.

30 comments

I don’t know about Silverblue, but I know you can use NixOS on pretty much any VPS using the tool nixos-infect.

Not sure how it would reduce your attack surface though. That’s not really the problem that they are trying to solve.

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- nixos-anywhere also works well for this use case.
  
  2
- Thank you, good to know. Not as straightforward as directly installing distro but certainly worth considering.
  
  As to why it reduces attack surface please see answer provided to other comment.
  
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I'm using NixOS in Azure - Azure allows creating a VM out of a disk image, and NixOS has tools to create preconfigured disk images. You inject your SSH keys and stuff straight into the image, then upload and create a VM. A bit fiddly, but I got it to work.

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I use https://fedoraproject.org/coreos/ for my server/website. My host doesn't offer it as an image so I have to upload it myself, but I use an ISO I made with the CLI to automatically set up everything anyway. It works pretty well, I configured auto updates and I can just forget about it.

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- Thank you for the tip. Unless my understanding is wrong both OS are similar, Coreos targeting more precisely Kubernetes and cluster management. Had a quick look, but definitively will read more about it.
  
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  I've used coreos happily on homelab bare metal.
  
  PXE booting it with cloudinit/ignition automation for provisioning.
  
  It's make for an excellent VPS.
  
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If you want MAC (SELinux or Apparmor) (which I highly recommend) then use Silverblue / CoreOS or even SUSE MicroOS

otherwise I use NixOS. (But like I said, I'm possibly looking into switching because of lacking MAC)

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How would describe the "reduced attack surface" of something running a container?

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- That phrase has practically lost all meaning.
  
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  Because even if an attacker could gain access even as root he cannot modify system files. This is why immutable OS distros are called immutable.
  
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Thanks, good to know about firewall.

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I think it is likely an option on both Linode and Digital ocean

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I will respond even though this post is several days old because I actually do this. I have some vpses on Hetzner that run Silverblue no problem. It is not an install option available by default there, but support uploaded an iso under my account quickly when asked.

If you do it, change the active firewalld zone. The default is for a desktop, so not great for vps space.

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