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[Alpine Linux documentation](https://docs.alpinelinux.org/user-handbook/0.1a/Installing/setup_alpine.html) assumes one can interract with system directly with a keyboard & display.\
However, there are many cases where one might want to deploy a headless system, only available through a network connection (ethernet, wifi or as USB ethernet gadget).
This repo provides an overaly file to initially boot the headless system (leveraging Alpine distro's `initramfs` feature): it enables a basic ssh server to log-into from another Computer, in order to finalize system set-up.
This repo provides an **overlay file** to initially boot the headless system (leveraging Alpine distro's `initramfs` feature): it enables a basic ssh server to log-into from another Computer, in order to finalize system set-up.
## Install procedure:
Please follow [Alpine Linux Wiki](https://wiki.alpinelinux.org/wiki/Installation#Installation_Overview) to download & create installation media for the chosen platform.\
Tools provided here can be used on any plaform for any install modes (diskless, data disk, system disk).
Just add [**headless.apkovl.tar.gz**](https://github.com/macmpi/alpine-linux-headless-bootstrap/raw/main/headless.apkovl.tar.gz) overlay file at the root of Alpine Linux boot media (or onto any writeable side-media) and boot the system.
Just add [**headless.apkovl.tar.gz**](https://github.com/macmpi/alpine-linux-headless-bootstrap/raw/main/headless.apkovl.tar.gz) overlay file at the root of Alpine Linux boot media (or onto any custom side-media) and boot the system.
With default network interface definitions (and optional wifi SSID/pass file), one may then access the system under `ssh` with:\
With default network interface definitions (and SSID/pass file if using wifi), one may then access the system under `ssh` with:\
`ssh root@<IP>` (system IP address may be determined with any IP scanning tools such as `nmap`).
As with Alpine Linux initial bring-up, `root` account has no password initially (change that after setup!).\
From there, system install can be fine-tuned as usual with `setup-alpine` for instance (check [wiki](https://wiki.alpinelinux.org/wiki/Alpine_setup_scripts#setup-alpine) for details).
Optional files can be added next to `headless.apkovl.tar.gz` to customise setup (sample files are provided):
- `wpa_supplicant.conf`: define wifi SSID & password (mandatory for wifi usecase).
- `interfaces`: define network interfaces at will, if defaults DCHP-based are not suitable.
- `unattended.sh`: make custom automated deployment script to further tune & extend setup (backgrounded).
Add-on files may be added next to `headless.apkovl.tar.gz` to customise setup (sample files are provided):
- `wpa_supplicant.conf` (*mandatory for wifi usecase*): define wifi SSID & password.
- `interfaces` (*optional*): define network interfaces at will, if defaults DCHP-based are not suitable.
- `unattended.sh` (*optional*): make custom automated deployment script to further tune & extend setup (backgrounded).
*Note:* these files are linux text files: Windows/macOS users need to use text editors supporting linux text line-ending (such as [notepad++](https://notepad-plus-plus.org/), BBEdit or any other).
**Goody:** seamless USB bootstrapping for PiZero devices (or similar which can support USB ethernet gadget networking):\
Just add `dtoverlay=dwc2` in `usercfg.txt` (or `config.txt`), and plug-in USB to Computer port.\
With Computer set-up to share networking with USB interface as 10.42.0.1 gateway, one can log into device from Computer with `ssh root@10.42.0.2` !...
Main execution steps are logged in `/var/log/messages`.
## How to customize further ?
This repository may be forked/cloned/downloaded.\
Main script file is [`headless.start`](https://github.com/macmpi/alpine-linux-headless-bootstrap/blob/main/overlay/etc/local.d/headless.start).\
Execute `./make.sh` to rebuild `headless.apkovl.tar.gz`.
*Side note:* one nicety for bootstrapping PiZero devices, or similar which can support USB ethernet gadget networking.\
Just add `dtoverlay=dwc2` in `usercfg.txt` (or `config.txt`), and plug-in USB to Computer port.\
With Computer set-up to share networking with USB interface, device will appear at 10.42.0.2 onto Computer's subnet to log into !...
Execute `./make.sh` to rebuild `headless.apkovl.tar.gz` after changes.
## Credits