Automation for setting up a k3s cluster on Raspberry Pi 4 SBCs.
Builds a custom Raspbian image pre-configured for k3s.
Does a few things.
- Provides a Dockerfile to create a minbase Raspbian image with k3s and k3sup preinstalled.
- Exports PEM and public key to access cluster machines.
- Sets up rc.local so that on first boot, the cluster master installs and configures a PXE boot environment for other machines.
git clone https://github.com/kgolsen/rpi4-k3s.gitcd rpi4-k3s; docker build . -t rpi4-k3s; docker run --rm --privileged -v <some_dir>:/var/local rpi4-k3s
docker run --rm --privileged -v <some_dir>:/var/local kgolsen/rpi4-k3s:latest
On Linux hosts, you may have to add --cap-add=CAP_MKNOD to allow creation of loopback devices in the container.
- You now have an image,
k3s-base-image.img, burnable to MicroSD with something like Etcher.- You also have the RSA keypair
k3s-masterkey.{pem,pub}, which will allow you to SSH into any cluster member as the userk3s.
- You also have the RSA keypair
- Boot up the rpi4 you intend to be the cluster master. First boot will take several minutes as the PXE boot environment is built. Afterwards, rc.local will have its execute bit disabled and the rpi4 will reboot. You are now ready to add more nodes to the cluster.
- More coming soon...
2020-05-12: Now that I'm working on the PXE boot, it's important to note that the cluster IP space is set (and small). I'm building this cluster behind a Mikrotik CRS112-8P-4S-IN, so it's important the cluster is sitting behind a programmable router or network issues will ensue.