What are problems that arise with Docker?

Since the end of 2020 Docker can no longer be used as a container runtime (engine) in Kubernetes, as the latest update of Kubernetes has excluded this choice. Because of that Managed Kubernetes services like GKE, EKS, or AKS will no longer work for worker nodes in the future. So if your service includes customizations for your nodes, you may need to update them based on your environment and runtime requirements.