devos/doc/start/iso.md
2021-08-01 16:38:52 -05:00

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# ISO
Making and writing an installable iso for `hosts/NixOS.nix` is as simple as:
```sh
bud build NixOS bootstrapIso
dd bs=4M if=result/iso/*.iso of=/dev/$your_installation_device \
status=progress oflag=sync
```
This works for any host.
## ISO image nix store & cache
The iso image holds the store to the live environment and _also_ acts as a binary cache
to the installer. To considerably speed up things, the image already includes all flake
`inputs` as well as the `devshell` closures.
While you _could_ provision any machine with a single stick, a custom-made iso for
the host you want to install DevOS to, maximises those local cache hits.
For hosts that don't differ too much, a single usb stick might be ok, whereas when
there are bigger differences, a custom-made usb stick will be considerably faster.