# 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-rcd)
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   As of OpenBSD 7.1, there's a headscale in ports collection, however, it's severely outdated(v0.12.4).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 v1.19+: headscale newer than 0.17 needs go 1.19+ 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
# option a. you can find offical relase at https://github.com/juanfont/headscale/releases/latest
# option b. get latest tag, this may be a beta release
latestTag=$(git describe --tags `git rev-list --tags --max-count=1`)

git checkout $latestTag

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 v1.19+: headscale newer than 0.17 needs go 1.19+ 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
# option a. you can find offical relase at https://github.com/juanfont/headscale/releases/latest
# option b. get latest tag, this may be a beta release
latestTag=$(git describe --tags `git rev-list --tags --max-count=1`)

git checkout $latestTag

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-rcd) before continuing.

5. Verify `headscale` is running:

Verify `headscale` is available:

```shell
curl http://127.0.0.1:9090/metrics
```

6. Create a user ([tailnet](https://tailscale.com/kb/1136/tailnet/)):

```shell
headscale users create myfirstuser
```

### 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 --user myfirstuser nodes register --key <YOU_+MACHINE_KEY>
```

### Register machine using a pre authenticated key

Generate a key using the command line:

```shell
headscale --user myfirstuser 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.