K3S – Lightweight Kubernetes

The docker container runtime must be used to complete some of the included scenarios. K3s uses containerd by default, so adding docker support requires the following steps during installation

• Ensure docker version is up-to-date. Reference this repo

curl https://releases.rancher.com/install-docker/20.10.sh | sh

• Change cgroup to cgroupfs because k3s does not use systemd cgroup

echo -e '{\n  "exec-opts": ["native.cgroupdriver=cgroupfs"]\n}' | sudo tee /etc/docker/daemon.json
sudo systemctl daemon-reload
sudo systemctl restart docker

• Install k3s on server with docker option

curl -sfL https://get.k3s.io | sh -s server --docker
SERVER_NAME=$(hostname)  # or enter your local IP address
NODE_TOKEN=$(cat /var/lib/rancher/k3s/server/node-token)

• Install k3s on agent with docker option

curl -sfL https://get.k3s.io | K3S_URL=https://${SERVER_NAME}:6443 K3S_TOKEN=${NODE_TOKEN} sh -s agent --docker