How to fix container runtime is not running in Kubernetes

which docker
which containerd
which cri-o

# Check kubelet config to see which is expected
cat /etc/kubernetes/kubelet.conf | grep -i "container-runtime"

sudo systemctl status docker     # or containerd/cri-o
sudo systemctl start docker
sudo systemctl enable docker

# For Docker
sudo docker ps

# For containerd
sudo ctr containers list

# For cri-o
sudo podman ps

sudo apt-get update
sudo apt-get install -y containerd.io
sudo mkdir -p /etc/containerd
containerd config default | sudo tee /etc/containerd/config.toml
sudo systemctl restart containerd

sudo systemctl restart kubelet
kubectl get nodes
# Wait for NotReady -> Ready transition
kubectl get nodes -w