Styjun

When I build a Docker image locally with a tag, then assign a secondary tag, I am unable to list all of the tags for that image.

I'm losing tags either on the build, save or load of docker images and I'm trying to track the state of my image at every step. Please note that this is a local Docker file (as in on my laptop), and can't be sent to a remote repository. When I run docker images I can see the image created with one of the tags, but not all of them.

$ docker build -t my/repo:first_tag
$ docker tag my/repo:first_tag my/repo:second_tag

When I run docker images I only see the first tag shown as the tag.

$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
my/repo first_tag abcd1234 6 seconds ago 100MB

I would like to have some way of showing that image with all of the tags, something like:

my/repo:
 first_tag
 second_tag

Does a command like this exist and, if so, what is it?

EDIT: It turns out I was adding tags wrong and the code show above wasn't representative of it. What I was doing was actually:

$ docker build -t my/repo:first_tag
$ docker tag my/repo:first_tag my/repo

Note that the second tag doesn't have an actual tag on it. When I actually run the code in the question I get the following output:

$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
my/repo second_tag abcd1234 6 seconds ago 100MB
my/repo first_tag abcd1234 6 seconds ago 100MB

If you want to list tags for a particular image, you can run :

docker images my/repo --format=" .Tag "

--format is used here to only keep interesting columns. By default, docker images my/repo will return all info about my/repo (repository, tag, image id, created and size), like docker images (without filtering repository) does.

Edit : group images by tags

Since --format option placeholders are limited (https://docs.docker.com/engine/reference/commandline/images/#format-the-output), you cannot access some interesting properties as .RepoTags to retrieve all tags associated with an image digest. However, you could do this by docker inspecting desired images and using some shell and jq magic (jq is a tool to manipulate JSON) :

docker images my/repo --format=" .ID " | 
 sort | uniq | 
 xargs docker inspect | 
 jq -r '.[] | [ .Id, (.RepoTags | join(",")) ] | @csv'

Explanations :

• first, retrieve all images IDs (--format=" .ID ") related to my/repo
  


• remove duplicates (sort | uniq) if any (because of multiple tags per image ID)


• for each image (xargs), inspect that image (docker inspect) :
  
  
  • use jq to retrieve a string like <id of the image>,<tags related to the image>. Tags related to this image are separated by a comma (join(","))
  
  

Example result :

"sha256:abcd1234...","my/repo:v1"
"sha256:abcd2345...","my/repo:v2"
"sha256:abcd3456...","my/repo:v3,my/repo:tag"