Why Kubernetes Dropped Docker Shim and How to Switch to Containerd
Kubernetes 1.24 removed the Docker shim, prompting users to adopt Containerd, and this article compares Docker and Containerd commands, logs, configuration differences, and CNI networking, highlighting how Containerd interacts directly via CRI and reduces bugs.
Kubernetes deprecated and removed the Docker shim in version 1.24, meaning Docker runtime is no longer supported from that version onward. Most users choose Containerd as the Kubernetes runtime.
docker‑ce is built on top of Containerd.
When using Containerd, kubelet interacts directly with the container runtime through the Container Runtime Interface (CRI) without needing the Docker shim, reducing an extra layer of calls and many bugs.
Below we discuss the differences between using Docker and Containerd.
Common Docker and Containerd Commands
crictlis the command used in Kubernetes to debug pods.
Standalone Containerd commands are ctr or nerdctl.
Container Log and Parameter Differences
CNI Networking
When using Containerd alone, the CNI network is the cri‑plugin. As the container runtime for Kubernetes, it uses the CNI network configured in Kubernetes, such as Flannel or Calico.
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