I love to use Alpine Linux because it is small and efficient. However, one tradeoff is that not everything works out of the box like on say Ubuntu.
When I was experimenting with Yggdrasil I had no problem with Debian, but Yggdrasil ran into some issues on Alpine.
Luckily, this is easy to fix. It took more digging than I would've liked so here is this post.
All of the steps below assume you are running as root, so make sure you can get root access of the machine you are working with.
Fortunately, there is already a package for yggdrasil for Alpine. This makes our lives easier because we can install in one line, and it already integrates with openrc.
apk add yggdrasil
This will install the binaries: yggdrasil and yggdrasilctl, as well as the yggdrasil openrc configurations.
One reason Alpine is so lightweight is it doesn't enable every kernel module under the sun. However, this through me for a loop.
Luckily, there is a mention of this in the yggdrasil docs. https://yggdrasil-network.github.io/platform-linux.html
We need to enable the tun kernel module, like so:
Now we have the binaries and the kernel module that yggdrasil depends on.
The next thing we need to do is generate the config. We can do it like this:
yggdrasil -genconf > /etc/yggdrasil.conf
Customize that config to your liking, but it should work fine without changes.
Now we can finally start the yggdrasil service.
Initialize the yggdrasil service with rc:
rc-service yggdrasil start
You can check the status:
rc-service yggdrasil status
Or take a look at the logs at /var/log/yggdrasil.log in case you run into any trouble.
Now you have yggdrasil running!
If you turn your computer on and off, you'll notice yggdrasil isn't running. You can enable yggdrasil to start on boot with this:
rc-update add yggdrasil
In order to connect to this machine you will need to know the IPv6 address that yggdrasil makes for you.
You can use yggdrasilctl to do that.
yggdrasilctl -v getSelf
Which will return something like this:
Build version: 0.3.15 IPv6 address: 200:dcb7:4f58:45a3:793d:5f7e:74c3:de98 IPv6 subnet: 300:dcb7:4f58:45a3::/64 Coords:  Public encryption key: 3a8667ab28cdf009094c704a95f61db5bff4ef6f18ae07de5ff0cf7edfb8cd2b
The IPv6 address will allow you to connect to your Alpine Linux machine for whatever application you want.
Have fun, and keep it decentralized!