Manage Image Attestation For Free

A tagged manifest is the asset that represents a component. (See Docker's documentation on manifests.) A Docker tag is an alias pointing at a manifest (i.e., the name attribute of the component). A layer is unique and only stored once in a repository; however, many manifests are able to reference one layer.

$ 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 is defined as an official verification that something is true or authentic. In terms of information technologies, it is the process that verifies that access to information, data, and resources is limited to authorized users.

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.

Attestation is the act of witnessing the signing of a formal document and then also signing it to verify that it was properly signed by those bound by its contents. Attestation is a legal acknowledgment of the authenticity of a document and a verification that proper processes were followed.

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

A single attestation can authorize identical images that are stored in multiple different locations or different registries, such as Artifact Registry, Container Registry, or an external container registry. At deploy time, Binary Authorization uses attestors to verify attestations.

Docker manifest is an experimental command to build docker images which support multiple architectures. Let's see how it works and compare it to docker buildx.