How can I find a Checksum of a Docker Image

Question

I'm using Docker 1.10.3.

Docker Image Specification v1.0.0 says there is an Image Checksum field in a Docker Image JSON Description, like:

"checksum": "tarsum.v1+sha256:e58fcf7418d2390dec8e8fb69d88c06ec07039d651fedc3aa72af9972e7d046b",

However, there is no such a field in the result of docker inspect <IMAGE>.

How can I get the checksum of a particular image?

Maybe relevant https://stackoverflow.com/questions/32046334/what%C2%B4s-the-sha256-code-of-a-docker-image — jDo, Mar 13 '16 at 07:32
as @jDo mentioned, see: https://stackoverflow.com/a/33511811 which answers this: `docker inspect --format='{{index .RepoDigests 0}}' $IMAGE` where $IMAGE can contain the tag. — ldg, Dec 14 '17 at 06:35

score 17 · Answer 1 · edited Aug 02 '17 at 14:45

17

You have the command

$ docker images --digests

for example:

docker images --digests busybox
REPOSITORY          TAG                 DIGEST                                                                    IMAGE ID            CREATED             SIZE
busybox             latest              sha256:32f093055929dbc23dec4d03e09dfe971f5973a9ca5cf059cbfb644c206aa83f   00f017a8c2a6        2 months ago        1.11 MB

edited Aug 02 '17 at 14:45

rjmunro

27,203
20
110
132

answered May 20 '17 at 14:42

user2915097

30,758
6
57
59

do you know how can i find sha1 checksum? – Mohammad Ravanbakhsh Apr 18 '23 at 06:18

Ricardo Branco · Answer 2 · 2018-10-11T07:50:23.237

4

docker images --digests --format '{{.Digest}}' IMAGE

Recent Docker versions introduced this new command that may deprecate the above:

docker image ls --digests --format '{{.Digest}}' IMAGE

edited Oct 11 '18 at 07:50

answered May 20 '17 at 15:45

Ricardo Branco

5,740
1
21
31

How can I find a Checksum of a Docker Image

2 Answers2