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Buildah is a tool for building OCI-compatible images through a lower-level coreutils interface. Buildah provides a command-line tool that replicates all the commands found in a Dockerfile. This tutorial shows you how to use Buildah to package a web-based application as a container starting from an existing image. Then, you'll run your container image with Podman and Docker. The Alpine Linux image is only 5 MB in size and it lacks several prerequisites that are required to run ExpressJS.