What is buildah?

Buildah is a command-line tool for creating container images, which are the packaged bundles that hold an application and everything it needs to run in an isolated environment. It produces images in the Open Container Initiative format, the same standard used by Docker and other container platforms, so the images it builds can run wherever those formats are accepted. The tool specializes in the build step: turning a set of instructions into a finished image. You can give it a Dockerfile (the standard recipe file format) or skip the Dockerfile entirely and build an image by running commands from a shell script or any other scripting language. It runs without requiring administrator-level permissions on the host system, and it does not run as a background service that needs to be kept running. Buildah works alongside a related tool called Podman, and the README explains the split clearly. Buildah focuses on building and assembling images. Podman focuses on running, managing, and maintaining containers made from those images. Under the hood, Podman actually calls Buildah's code when it needs to build something. The two tools use different storage layers and cannot see each other's working containers during the build process. Common operations in Buildah include starting a working container from an existing image or from scratch, running commands inside that container to install software or copy files, setting configuration options like which port to expose or what command to run at startup, and then committing the finished container into a new image ready for distribution. The project lives under the containers organization on GitHub and is primarily written in Go. Installation notes and tutorials are included in the repository.