add openbsd doc

docs/README.md

@@ -27,6 +27,7 @@ written by community members. It is _not_ verified by `headscale` developers.
 **It might be outdated and it might miss necessary steps**.
 
 - [Running headscale in a container](running-headscale-container.md)
+- [Running headscale on OpenBSD](running-headscale-openbsd.md)
 
 ## Misc
 

docs/running-headscale-openbsd.md

@@ -0,0 +1,197 @@
+# Running headscale on OpenBSD
+
+## Goal
+
+This documentation has the goal of showing a user how-to install and run `headscale` on OpenBSD 7.1.
+In additional to the "get up and running section", there is an optional [rc.d section](#running-headscale-in-the-background-with-rc.d)
+describing how to make `headscale` run properly in a server environment.
+
+## Install `headscale`
+1. Install from ports (Not Recommend)
+
+   As of OpenBSD 7.1, there's a headscale in ports collection, however, it's severely outdated(v0.12.4).
+   You can install it via `pkg_add headscale`.
+
+2. Install from source on OpenBSD 7.1
+
+``` shell
+# Install prerequistes
+# 1. go v1.18+: headscale newer than 0.15 needs go 1.18+ to compile
+# 2. gmake: Makefile in the headscale repo is written in GNU make syntax
+pkg_add -D snap go
+pkg_add gmake
+
+git clone https://github.com/juanfont/headscale.git
+
+cd headscale
+
+# optionally checkout a release
+git checkout v0.16.0-beta1
+
+gmake build
+
+# make it executable
+chmod a+x headscale
+
+# copy it to /usr/local/sbin
+cp headscale /usr/local/sbin
+```
+
+3. Install from source via cross compile
+
+``` shell
+# Install prerequistes
+# 1. go v1.18+: headscale newer than 0.15 needs go 1.18+ to compile
+# 2. gmake: Makefile in the headscale repo is written in GNU make syntax
+
+git clone https://github.com/juanfont/headscale.git
+
+cd headscale
+
+# optionally checkout a release
+git checkout v0.16.0-beta1
+
+make build GOOS=openbsd
+
+# copy headscale to openbsd machine and put it in /usr/local/sbin
+```
+
+## Configure and run `headscale`
+
+1. Prepare a directory to hold `headscale` configuration and the [SQLite](https://www.sqlite.org/) database:
+
+```shell
+# Directory for configuration
+
+mkdir -p /etc/headscale
+
+# Directory for Database, and other variable data (like certificates)
+mkdir -p /var/lib/headscale
+```
+
+2. Create an empty SQLite database:
+
+```shell
+touch /var/lib/headscale/db.sqlite
+```
+
+3. Create a `headscale` configuration:
+
+```shell
+touch /etc/headscale/config.yaml
+```
+
+It is **strongly recommended** to copy and modify the [example configuration](../config-example.yaml)
+from the [headscale repository](../)
+
+4. Start the headscale server:
+
+```shell
+headscale serve
+```
+
+This command will start `headscale` in the current terminal session.
+
+---
+
+To continue the tutorial, open a new terminal and let it run in the background.
+Alternatively use terminal emulators like [tmux](https://github.com/tmux/tmux).
+
+To run `headscale` in the background, please follow the steps in the [rc.d section](#running-headscale-in-the-background-with-rc.d) before continuing.
+
+5. Verify `headscale` is running:
+
+Verify `headscale` is available:
+
+```shell
+curl http://127.0.0.1:9090/metrics
+```
+
+6. Create a namespace ([tailnet](https://tailscale.com/kb/1136/tailnet/)):
+
+```shell
+headscale namespaces create myfirstnamespace
+```
+
+### Register a machine (normal login)
+
+On a client machine, execute the `tailscale` login command:
+
+```shell
+tailscale up --login-server YOUR_HEADSCALE_URL
+```
+
+Register the machine:
+
+```shell
+headscale --namespace myfirstnamespace nodes register --key <YOU_+MACHINE_KEY>
+```
+
+### Register machine using a pre authenticated key
+
+Generate a key using the command line:
+
+```shell
+headscale --namespace myfirstnamespace preauthkeys create --reusable --expiration 24h
+```
+
+This will return a pre-authenticated key that can be used to connect a node to `headscale` during the `tailscale` command:
+
+```shell
+tailscale up --login-server <YOUR_HEADSCALE_URL> --authkey <YOUR_AUTH_KEY>
+```
+
+## Running `headscale` in the background with rc.d
+
+This section demonstrates how to run `headscale` as a service in the background with [rc.d](https://man.openbsd.org/rc.d).
+
+1. Create a rc.d service at `/etc/rc.d/headscale` containing:
+
+```shell
+#!/bin/ksh
+
+daemon="/usr/local/sbin/headscale"
+daemon_logger="daemon.info"
+daemon_user="root"
+daemon_flags="serve"
+daemon_timeout=60
+
+. /etc/rc.d/rc.subr
+
+rc_bg=YES
+rc_reload=NO
+
+rc_cmd $1
+```
+
+2. `/etc/rc.d/headscale` needs execute permission:
+
+```shell
+chmod a+x /etc/rc.d/headscale
+```
+
+3. Start `headscale` service:
+
+```shell
+rcctl start headscale
+```
+
+4. Make `headscale` service start at boot:
+
+```shell
+rcctl enable headscale
+```
+
+5. Verify the headscale service:
+
+```shell
+rcctl check headscale
+```
+
+Verify `headscale` is available:
+
+```shell
+curl http://127.0.0.1:9090/metrics
+```
+
+`headscale` will now run in the background and start at boot.