Docker-to-Kubernetes Image Workflow on Ubuntu Remains Unchanged Despite Runtime Shifts

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Despite the removal of dockershim in 2022, the core workflow of building container images with Docker and deploying them on Kubernetes has not changed. Docker remains a reliable build tool, and Kubernetes continues to run OCI-compliant images regardless of whether the underlying node runtime is containerd or cri-dockerd. Best practices include using multi-stage Dockerfiles to minimize image size, tagging images with immutable version numbers instead of 'latest' to ensure reliable rollbacks, and configuring readiness probes to prevent traffic from reaching pods before the application is ready. Registry authentication must be explicitly configured via pull secrets, or pods will fail with an ImagePullBackOff error. Keeping the build tool, node runtime, and deployment manifests as distinct concerns allows developers to work without being affected by changes at the runtime layer.

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