How to find the creation date of an image in a (private) Docker registry (API v2)?

docker docker-registry
snth picture snth · Sep 16, 2015 · Viewed 9.2k times · Source

I would like to find out the latest timestamp for an image in a private Docker registry using the v2 API without first pulling the image to my local host.

Answer

snth picture snth · Sep 16, 2015

So after some hacking around, I got the following to work using the curl and jq tools:

curl -X GET http://registry:5000/v2/<IMAGE>/manifests/<TAG> \
    | jq -r '.history[].v1Compatibility' \
    | jq '.created' \
    | sort \
    | tail -n1

This seems to work but I don't really know how the v1 Compatibility representation is to be interpreted so I don't know if I am really getting the correct number out of this.

Comments on this are welcome!

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