Where can I find the sha256 code of a docker image?

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Latest answer

Edit suggested by OhJeez in the comments.

docker inspect --format="{{index .RepoDigests 0}}" $IMAGE

Original answer

I believe you can also get this using

docker inspect --format="{{.RepoDigests}}" $IMAGE

Works only in Docker 1.9 and if the image was originally pulled by the digest. Details are on the docker issue tracker.

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