Buildah is a free command-line tool for building OCI container images on Linux. It can build from working containers, Dockerfiles, or Containerfiles, and also supports image creation through commands and scripts without a build file. Output can use OCI format or the traditional upstream Docker image format. Builds can run without root privileges, and Buildah uses a fork-exec model rather than running as a daemon. Its commands manage working containers—creating, mounting, unmounting, deleting, and renaming them—and can create or delete images. Users can also pull images from a specified location and push images from local storage. Buildah is based on a Go API that other tools can vendor; Podman uses that API for Dockerfile builds and can be installed independently. Buildah requires a kernel supporting OverlayFS or fuse-overlayfs; RHEL or CentOS requires version 7.4 or higher. The project site points users to tutorials, releases, and a mailing list.
Who it is for
Buildah suits Linux users who need to build and manage container images, including those who want rootless builds or a tool they can use without a daemon. Its Go API may also suit developers building container-image functions into other tools.
What is good
- Builds OCI and traditional upstream Docker images.
- Supports rootless builds.
- Can build with or without Dockerfiles.
- Commands manage containers and images.
- Free plan; no paid tiers stated.
What to know first
- Linux is the supported host OS.
- Requires OverlayFS or fuse-overlayfs support.
- RHEL or CentOS requires version 7.4 or higher.
- Uses runc for buildah run and RUN instructions.
Verdict
Buildah offers several image-building routes and container-management commands in a free Linux command-line tool. Check kernel support and registry naming guidance before using it; the project warns that unqualified image names can be spoofed.
Buildah plans and pricing
All plansCompared on container build tools
- Free plan
- Yes
