From Docker Build to Kubernetes Deploy on Ubuntu: The Image Workflow That Never Changed

Amid all the noise about dockershim, one thing got lost: the everyday workflow of building an image with Docker and running it on Kubernetes never changed. Docker is still an excellent build tool, Kubernetes still runs OCI images, and on Ubuntu the loop is clean. Here it is end to end.

1. A build-friendly Dockerfile

Multi-stage keeps the runtime image small and the attack surface low — this matters more on Kubernetes, where you pull the image onto every node that schedules the pod:

# build stage

FROM golang:1.22 AS build