Yes, they do not depend on Docker anymore. In fact, this runtime is used in Red Hat OpenShift now. They provides CRI and it's 100% what Docker provides, too.Ĭontainerd is 100% open source so you can see docs on GitHub and even contribute to it too.ĬRI-O is a CRI runtime mainly developed by Red Hat folks. If you just want to migrate from Docker, this is the best option as containerd is actually used inside of Docker to do all the "runtime" jobs as you can see in the diagram above. There are two major CRI runtime implementations. So this is where you start considering alternatives. The less features you have, the smaller the attack surface becomes.
Having more features while you never use, itself can be a security risk. Docker Network and Volume are not used in Kubernetes. So yeah, Kubernetes actually needs inside of the red area. To explain the next reason, we have to see the Docker architecture a bit. kubelet on each node fetch metadata and it execs CRI to run create/delete containers on the node.Īgain, Kubernetes only talks in CRI and talking to Docker requires a bridge service. You can see that each Kubernetes node talks to the control plane. In this architecture, Docker, or a container runtime, is used only to run those applications in an actual host by being scheduled by Kubernetes control plane.
Kubernetes is an infra orchestration tool that groups up many different compute resources such as virtual/physical machines and make it look like a huge compute resource for your application to run and share with others. It converts Docker API and CRI, but it will no longer be provided from Kubernetes side within a few minor releases.ĭocker in local is a very powerful tool to create dev environment for sure, but in order to understand what's causing this, you need to understand what Docker does in the current Kubernetes architecture. In short, what it means here is that Docker does not support Kubernetes Runtime API called CRI(Container Runtime Interface) and Kubernetes people have been using a bridge service called "dockershim". We encourage you to evaluate moving to a container runtime that is a full-fledged implementation of CRI (v1alpha1 or v1 compliant) as they become available. The kubelet uses a module called "dockershim" which implements CRI support for Docker and it has seen maintenance issues in the Kubernetes community. Docker is now deprecated in Kubernetes.ĭocker support in the kubelet is now deprecated and will be removed in a future release. Read this carefully and start considering Docker alternatives AWS Batch lets you run highly-scalable batch processing workloads using Docker containers.Don't panic, Docker containers and images are still alive. Amazon Elastic Container Registry (ECR) is a highly available and secure private container repository that makes it easy to store and manage your Docker container images, encrypting and compressing images at rest so they are fast to pull and secure. AWS Fargate is a technology for Amazon ECS that lets you run containers in production without deploying or managing infrastructure. Amazon Elastic Container Service for Kubernetes (EKS) makes it easy for you to run Kubernetes on AWS. AWS Fargate is technology for Amazon ECS that lets you run containers without provisioning or managing servers. There are a number of ways to run containers on AWS, including Amazon Elastic Container Service (ECS) is a highly scalable, high performance container management service. Customers can easily deploy their containerized applications from their local Docker environment straight to Amazon ECS. AWS provides support for both Docker open-source and commercial solutions.
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