Gleipnir/nixos-systems
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Add things I've learned from building a custom image

Browse source 
Still isn't working quite right, but it's a lot of stuff I'd rather not
lose.
This commit is contained in:
Eli Ribble 2025-07-10 21:22:29 +00:00
parent e800fdea4e
commit 6432c4a5a7
4 changed files with 75 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

34
README.md
View file

@ -9,5 +9,37 @@ Hat tip to [the negation](https://thenegation.com/posts/nixos-do-colmena/) for s
Build a custom image for Digital Ocean:
```
nix-build digitalocean/custom-image.nix
> nix-build digitalocean/custom-image.nix
...
/nix/store/rm84j1a5bskhg2z8gz633m4apjyg848c-digital-ocean-image
> ls -lh result/
nixos-image-digital-ocean-25.05pre-git-x86_64-linux.qcow2.gz nix-support/
```
In order to "upload" the image to Digital Ocean you'll need to make the image available via URL. We can use Gleipnir static storage as an example:
```
rsync result/nixos-image-digital-ocean-25.05pre-git-x86_64-linux.qcow2.gz static.gleipnir.technology:/tmp
```
Make sure the image is accessible via a public URL.
Then upload either through the web interface, or using [doctl](https://docs.digitalocean.com/reference/doctl/)
```
> doctl compute image create "Gleipnir NixOS 25.05" -v --image-description "NixOS 25.05 with ssh keys for eliribble baked in" --image-distribution nixos-25.05 --image-url "https://static.gleipnir.technology/nixos-image-digital-ocean-25.05pre-git-x86_64-linux.qcow2.gz" --region sfo3 --tag-names nixos
ID Name Type Distribution Slug Public Min Disk Created
192948683 Gleipnir NixOS 25.05 custom Unknown OS false 0 2025-07-10T20:22:43Z1G
```
Then start a droplet using that image:
```
> doctl compute droplet create "test2.nidus.cloud" --enable-ipv6 --image 192948683 --project-id ce2159e8-02f5-4169-8943-f34ccf812d23 --region sfo3 --size s-1vcpu-1gb --ssh-keys 48777034 --tag-name nixos --wait
Error: POST https://api.digitalocean.com/v2/droplets: 422 (request "116c778d-8e72-4099-a7c6-c3ad37557c4c") image is not compatible with ipv6
```
Oh. [Well that sucks](https://docs.digitalocean.com/products/custom-images/details/limits/). Digital Ocean can't do IPv6 on custom images.
## With cloud-init
Cloud init data:
curl http://169.254.169.254/metadata/v1.json