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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.
587
The Docker Registry HTTP API is the protocol to facilitate distribution of images to the docker engine. It interacts with instances of the docker registry, which is a service to manage information about docker images and enable their distribution.
You can just create a new file name, dockertags , under /usr/local/bin (or add a PATH env to your . bashrc / . zshrc ), and put that code in it. Then add the executable permissions( chmod +x dockertags ).
A private Docker registry allows you to share your custom base images within your organization, keeping a consistent, private, and centralized source of truth for the building blocks of your architecture.
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!
127
A minor improvement to the answer from @snth : print the date more user friendly by using date:
date --date=$(curl -s -X GET http://$REGISTRY:5000/v2/$IMAGE/manifests/$TAG | \
jq -r '.history[].v1Compatibility' | jq -r '.created' | sort | tail -n 1 )
Prints something like:
Fr 12. Okt 15:26:03 CEST 2018
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