Store Image Attestation For Free

To remove the Docker build cache, we can run the docker buildx prune command to clear the build cache of the default builder. If we want to remove the build cache for a specific builder, we can use the --builder flag to specify the builder name.

In docker build all builds finish by creating a container image and exporting it to docker images . buildx makes this step configurable allowing results to be exported directly to the client, oci image tarballs, registry etc. Buildx with docker driver currently only supports local, tarball exporter and image exporter.

To view the contents of a Docker image, you can use the docker run command to start a container from the image and then use commands such as ls or cat to view the contents of the container. If you prefer not to start the container, there is an option for docker image save command .

The provenance attestations include facts about the build process, including details such as: Build timestamps. Build parameters and environment. Version control metadata. Source code details.

For example, --provenance=false can be used to disable all provenance attestations, while --provenance=true can be used to enable all provenance attestations. By default, a minimal provenance attestation will be created for.

It's the verifiable information about software artifacts describing where, when and how something was produced. For higher SLSA levels and more resilient integrity guarantees, provenance requirements are stricter and need a deeper, more technical understanding of the predicate.

A Docker registry is a system for versioning, storing and distributing Docker images. DockerHub is a hosted registry used by default when installing the Docker engine, but there are other hosted registries available for public use such as AWS and Google's own registries.

Setting the DOCKER_BUILDKIT environment variable to 0 will disable BuildKit. However, changing the Docker engine configuration doesn't have the same disabling effect on BuildKit.

$ docker buildx build --sbom=true --provenance=true . Provenance attestations are enabled by default, with the mode=min option. You can disable provenance attestations using the --provenance=false flag, or by setting the BUILDX_NO_DEFAULT_ATTESTATIONS environment variable.

Attestation Manifest Attestation manifests are attached to the root image index object, under a separate OCI image manifestopen_in_new. Each attestation manifest can contain multiple attestation blobs, with all the of the attestations in a manifest applying to a single platform manifest.