Open Container Initiative - Open Container Initiative

Open Container Initiative

The Open Container Initiative is an open governance structure for the express purpose of creating open industry standards around container formats and runtimes.

Established in June 2015 by Docker and other leaders in the container industry, the OCI currently contains three specifications: the Runtime Specification (runtime-spec), the Image Specification (image-spec) and the Distribution Specification (distribution-spec). The Runtime Specification outlines how to run a “filesystem bundle” that is unpacked on disk. At a high-level an OCI implementation would download an OCI Image then unpack that image into an OCI Runtime filesystem bundle. At this point the OCI Runtime Bundle would be run by an OCI Runtime.

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2026-04-06 in Blog

OCI Distribution Spec Conformance Redesign

The OCI Distribution Spec conformance suite has received a significant rewrite. As a result of this rewrite, registry authors and operators will likely see new issues reported that were not detected in previous versions of the conformance suite.

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2025-11-04 in Blog

OCI Runtime Spec v1.3

We are delighted to announce the release of the OCI Runtime Spec v1.3.0. This release contains 24 pull requests that were merged since the 1.

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