OCI Image Spec

OCI spec of the universal container image format.

Definition

OCI Image Spec v1.1.0 (2024) defines Image Manifest (application/vnd.oci.image.manifest.v1+json), Image Index (multi-platform), Image Config (rootfs, history, env), Layer (tar+gzip or tar+zstd), Descriptor (digest SHA-256, mediaType, size). OCI v1.1 evolution adds Artifact Manifest for non-image artifacts (SBOM, signatures, attestations). Adopted by all registries (Docker Hub, ECR, ACR, GAR, Harbor, Quay).

Origin

Open Container Initiative founded 2015 (Linux Foundation), v1.0.0 2017, v1.1.0 February 2024.

Usage

De facto standard for container images and OCI artifacts. Foundation of modern cloud-native industry.

Related terms

• OCI — organisation parent.
• OCI Runtime — spec runtime jumelle.
• OCI Distribution — spec distribution jumelle.