Don't Panic: Kubernetes and Docker
Submitted by Roy Schestowitz on Thursday 3rd of December 2020 05:52:50 AM
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Docker as an underlying runtime is being deprecated in favor of runtimes that use the Container Runtime Interface(CRI) created for Kubernetes. Docker-produced images will continue to work in your cluster with all runtimes, as they always have.
If you’re an end-user of Kubernetes, not a whole lot will be changing for you. This doesn’t mean the death of Docker, and it doesn’t mean you can’t, or shouldn’t, use Docker as a development tool anymore. Docker is still a useful tool for building containers, and the images that result from running docker build can still run in your Kubernetes cluster.
If you’re using a managed Kubernetes service like GKE or EKS, you will need to make sure your worker nodes are using a supported container runtime before Docker support is removed in a future version of Kubernetes. If you have node customizations you may need to update them based on your environment and runtime requirements. Please work with your service provider to ensure proper upgrade testing and planning.
If you’re rolling your own clusters, you will also need to make changes to avoid your clusters breaking. At v1.20, you will get a deprecation warning for Docker. When Docker runtime support is removed in a future release (currently planned for the 1.23 release in late 2021) of Kubernetes it will no longer be supported and you will need to switch to one of the other compliant container runtimes, like containerd or CRI-O. Just make sure that the runtime you choose supports the docker daemon configurations you currently use (e.g. logging).
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