mirror of
https://github.com/elitak/nixos-infect
synced 2024-11-10 05:54:20 +00:00
104 lines
3.5 KiB
Markdown
104 lines
3.5 KiB
Markdown
This script aims to install NixOS on Digital Ocean droplets, Vultr servers, or
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OVH Virtual Private Servers (starting from distros that these services support
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out of the box).
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## Source Distros
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This script has been tested and can install NixOS from the following source distros:
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On Digital Ocean:
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- Fedora 24 x64
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- Ubuntu 20.04 x64
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On Vultr:
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- Ubuntu 18.10 x64
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On OVH Virtual Private Servers (experimental):
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- Debian
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On Hetzner cloud:
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- Ubuntu 18.04
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YMMV with any other hoster + image combination.
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If you have a OpenVZ based virtualization solution then this, or any other OS takeover script will not work, this is fundamental to how OpenVZ works.
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## Considerations
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nixos-infect is so named because of the high likelihood of rendering a system
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inoperable. Use with caution and preferably only on newly-provisioned
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systems.
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*WARNING NB*: This script wipes out the targeted host's root filesystem when it
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runs to completion. Any errors halt execution. It's advised to run with
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`bash -x` to help debug, as often a failed run leaves the system in an
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inconsistent state, requiring a rebuild (in DigitalOcean panel: Droplet
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Settings -> "Destroy" -> "Rebuild from original").
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## Digital Ocean
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*TO USE:*
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- Add any custom config you want (see notes below)
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- Deploy the droplet indicated at the top of the file, enable ipv6, add your ssh key
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- `cat customConfig.optional nixos-infect | ssh root@targethost`
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Alternatively, you may utilize Digital Ocean's "user data" mechanism (found in the Web UI or HTTP API), and supply to it the following example yaml stanzas:
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```yaml
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#cloud-config
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runcmd:
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- curl https://raw.githubusercontent.com/elitak/nixos-infect/master/nixos-infect | PROVIDER=digitalocean NIX_CHANNEL=nixos-20.03 bash 2>&1 | tee /tmp/infect.log
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```
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Potential tweaks:
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- `/etc/nixos/{,hardware-}configuration.nix`: rudimentary mostly static config
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- `/etc/nixos/networking.nix`, networking settings determined at runtime tweak
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if no ipv6, different number of adapters, etc.
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```yaml
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#cloud-config
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write_files:
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- path: /etc/nixos/host.nix
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permissions: '0644'
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content: |
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{pkgs, ...}:
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{
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environment.systemPackages = with pkgs; [ vim ];
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}
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runcmd:
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- curl https://raw.githubusercontent.com/elitak/nixos-infect/master/nixos-infect | PROVIDER=digitalocean NIXOS_IMPORT=./host.nix NIX_CHANNEL=nixos-20.03 bash 2>&1 | tee /tmp/infect.log
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```
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## Vultr
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To set up a NixOS Vultr server, instantiate an Ubuntu box with the following "Startup Script":
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```bash
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#!/bin/sh
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curl https://raw.githubusercontent.com/elitak/nixos-infect/master/nixos-infect | NIX_CHANNEL=nixos-20.03 bash
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```
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Allow for a few minutes over the usual Ubuntu deployment time for NixOS to download & install itself.
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## Hetzner cloud
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Hetzner cloud works out of the box. When creating a server provide the following script as "User data" (this has been tested using Ubuntu 20.04 as a base OS).
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```
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#!/bin/sh
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curl https://raw.githubusercontent.com/elitak/nixos-infect/master/nixos-infect | NIX_CHANNEL=nixos-20.03 bash 2>&1 | tee /tmp/infect.log
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```
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## Motivation
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Motivation for this script: nixos-assimilate should supplant this script
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entirely, if it's ever completed. nixos-in-place was quite broken when I
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tried it, and also took a pretty janky approach that was substantially more
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complex than this (although it supported more platforms): it didn't install
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to root (/nixos instead), left dregs of the old filesystem (almost always
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unnecessary since starting from a fresh deployment), and most importantly,
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simply didn't work for me! (old system was being because grub wasnt properly
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reinstalled)
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