Cloud · head to head
Buildah vs Skopeo
Buildah
Cloud
Build OCI container images without a daemon or a Dockerfile
- From
- Free
- Rated
- -
Skopeo
Cloud
Inspect, copy and sign container images without pulling them
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Buildah linux only, with no native macOS or Windows support; Skopeo single-purpose: it neither builds nor runs images, so it is one tool in a chain rather than a solution
- They diverge on capability: Buildah covers Daemonless builds, Skopeo covers Remote inspection.
Where they differ
Only the attributes on which Buildah and Skopeo actually diverge.
Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated), category (Cloud).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Buildah
- Daemonless builds
- Rootless
- Dockerfile compatible
- Scriptable builds
Only in Skopeo
- Remote inspection
- Registry-to-registry copy
- Format conversion
- Image signing
What people use each for
The jobs each tool is most often brought in to do.
Buildah
- Building images in CI without a privileged Docker daemonnot Skopeo
- Producing minimal images with tighter layer control than a Dockerfile givesnot Skopeo
- Scripted image assembly where a Dockerfile is the wrong abstractionnot Skopeo
Skopeo
- Promoting images between staging and production registries without a round tripnot Buildah
- Inspecting an image’s contents before deciding to deploy itnot Buildah
- Mirroring images into an air-gapped or internal registrynot Buildah
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Buildah
- Linux only, with no native macOS or Windows support
- Scriptable builds are powerful but less portable and less familiar than a Dockerfile
- Narrow by design: it builds images and does not run them, so it needs Podman or another runtime alongside
Skopeo
- Single-purpose: it neither builds nor runs images, so it is one tool in a chain rather than a solution
- Command syntax with transport prefixes such as docker:// is unusual and trips people up initially
- Documentation is sparse compared with the rest of the container ecosystem
Pricing, plan by plan
Buildah
Free- BuildahFree
- Full functionality
- No usage limits
- Community support
Skopeo
Free- SkopeoFree
- Full functionality
- No usage limits
- Community support
Which should you pick?
Choose Buildah if
- You need daemonless builds.
- You want to start without paying.
- You work on Linux.
- You also want rootless.
Choose Skopeo if
- You need remote inspection.
- You want to start without paying.
- You work on Linux, macOS.
- You also want registry-to-registry copy.
Questions people ask
- Is Buildah or Skopeo better?
- Neither clearly leads. Buildah starts at Free and Skopeo at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Buildah or Skopeo?
- Buildah starts at Free and Skopeo at Free.
- Does Buildah or Skopeo run on more platforms?
- Buildah runs on Linux. Skopeo runs on Linux, macOS.
- Can I use Buildah for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Buildah best used for?
- Buildah is most often used for building images in ci without a privileged docker daemon, producing minimal images with tighter layer control than a dockerfile gives, scripted image assembly where a dockerfile is the wrong abstraction. Of those, building images in ci without a privileged docker daemon and producing minimal images with tighter layer control than a dockerfile gives are not what Skopeo is typically brought in for.
- What can Buildah do that Skopeo cannot?
- Buildah covers Daemonless builds, Rootless, Dockerfile compatible, Scriptable builds. Skopeo covers Remote inspection, Registry-to-registry copy, Format conversion, Image signing.
Answered from the vendors’ own pages
Buildah: Is Buildah free?
Yes, open source with no licence fee.
Skopeo: Is Skopeo free?
Yes, open source with no licence fee.
Buildah: Do I still need a Dockerfile?
No. Buildah reads Dockerfiles if you have them, but images can be built entirely from shell commands instead.
Skopeo: Why copy images without pulling them?
A registry-to-registry copy avoids downloading and re-uploading gigabytes, which is faster and much cheaper on bandwidth in CI.
Buildah: How is Buildah different from Podman?
Buildah builds images; Podman runs them. Podman actually embeds Buildah for its build command, and the two are designed to be used together.
Skopeo: Can Skopeo run containers?
No. It only inspects, copies, signs and deletes images. Running them is Podman’s or Docker’s job.
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