How to list Docker images for arm64?

Question

I own a Mac M1 and I run Docker on it. On OSX, Docker can run native ARM images but also emulate x86/amd64 to run images that were not built for ARM.

From the command line, how do I find an extension of the command 'docker image ls' which displays the image platform?

$ docker image ls

REPOSITORY   TAG     **PLATFORM**  IMAGE ID   CREATED   SIZE  
.............................arm64  
.............................x86  

I already saw this answer: How to filter Docker images by platform? but it does NOT answer the question. OS and PLATFORM are two different things.

Answer 1

Is this what you looking for?

docker image inspect \
  --format "{{.ID}} {{.RepoTags}} {{.Architecture}}" \
  $(docker image ls -q)

output:

sha256:fb495265b81ffaa0d3bf8887231b954a1139b2e3d611c3ac3ddeaff72313909c [postgres:10.11-alpine] amd64

Explanation:

• $(docker image ls -q) → pass all image IDs as parameters to inspect command
• docker image inspect print detailed info about image
  • --format "{{.ID}} {{.RepoTags}} {{.Architecture}}" → print only necessary data instead of full JSON

Also it is possible to add pipe with grep, like {inspect command} | egrep 'amd64$' to print only amd64 architecture for example.

Answer 2

Try to combine docker image with jq :

docker image inspect \
    $(docker images -q) \
    | jq -r '.[] | select(.Architecture=="arm64").RepoTags[]'