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How to see docker image layers when image tag is not present – Nginx

I was trying various options of "docker image history" command to see the image layers used to build the image on my local machine.

There is a nginx image on my system which has no tags assigned. So "docker images" command lists the following images in my system.

enter image description here

I tried to find layer details for nginx image using following command :

docker image history nginx

But as the tag name is not specified, docker-cli considers it default "latest" tag which is not present on my system and I am getting following error :

Error response from daemon: No such image: nginx:latest

I tried the same command with "none" as tag but it also failed with following error :

docker image history nginx:none
Error response from daemon: No such image: nginx:none

Any suggestions ? How can we see layers of an images which does not have tag assigned.

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3

Answers


  1. Chosen as BEST ANSWER
    0

    I found --filter option for docker images command which we can use to find dangling/untagged images as below :

    docker images -f "dangling=true" --quiet

    We can use this command to list image layers for the untagged image as below :

    docker image history  $(docker images -f "dangling=true" --quiet)

  2. 0

    Try using ID instead of name with tag.

    Let say that I have this output of docker images

    REPOSITORY TAG      IMAGE ID       CREATED      SIZE
postgres   <none>   1f0815c1cb6e   7 weeks ago  314M

    I can use docker image history and specify the ID or part of it sufficient to identify the image in this context.

    docker image history 1f0
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  3. 0 
    docker history <your-docker-image-id>

    In your case it is as follows:

    docker history 7ce4f91ef623
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