devos/doc/start/iso.md

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2021-02-14 03:38:20 +01:00
# ISO
Making and writing an installable iso for `hosts/NixOS.nix` is as simple as:
```sh
flk iso NixOS
dd bs=4M if=result/iso/*.iso of=/dev/$your_installation_device \
status=progress oflag=sync
```
This works for any file matching `hosts/*.nix` excluding `default.nix`.
## ISO image nix store & cache
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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.
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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.
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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.