Docker save/load lose original image repository/name/tag

Question

I'm using Docker 1.12.6.

I have pulled an image from the Docker registry. I have exported the images as tar files using the docker save command.

I removed the original image and container and loaded the exported image using docker load -i myImage.tar .

Now, when running docker images I notice my image have lost its repository/tag information:

    REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
<none>              <none>              5fae4d4b9e02        8 weeks ago         581.3 MB

Why does it have this behavior and how do I keep the original image name?

Answer 1

Use

docker save -o filename.tar <repo>:<tag>

The command docker save <image id> removes the repository and tag names.

To solve this, use docker save <repo>:<tag> it will keep the repository and tag name in the saved file. For example:

docker save -o ubutu-18.04.tar ubuntu:18.04

Answer 2

I had the same problem, so then I used with the following command to fix it manually:

docker tag <Image-ID> <desired Name:Tag>

_Reference

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[ NOTE ]:

It's inconsistent: docker save image-repo-name -> docker load restores name, docker save SHA -> docker load no names or tags, docker save name:latest -> docker load no names or tags.

AND :

The current (and correct) behavior is as follows:

 docker save repo

Saves all tagged images + parents in the repo, and creates a repositories file listing the tags

docker save repo:tag

Saves tagged image + parents in repo, and creates a repositories file listing the tag

docker save imageid

Saves image + parents, does not create repositories file. The save relates to the image only, and tags are left out by design and left as an exercise for the user to populate based on their own naming convention.

_Reference

Answer 3

A single image ID can have multiple names/tags, so the way that you loose the the names and tags is what I would expect to happen after saving and loading the image to/from a tar ball.

Mode details are in the discussion about it here

Answer 4

From docker documentation:

cat exampleimage.tgz | docker import - exampleimagelocal:new

root@mymachine:/tmp# cat myimage.tar | docker import --message "New image imported from tarball" - reponame:my-image-name
sha256:be0794427222dcb81182a59c4664b350ecb5ffb7b37928d52d72b31
root@mymachine:/tmp# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
reponame          my-image-name    be0794427222        6 seconds ago       4.31GB

This one worked for me.

Answer 5

This is a work around

1. Go to source docker host machine, create text file containing all the image details using the following command docker image ls > images.txt

2. The above command will produce a text file similar to the following REPOSITORY TAG IMAGE ID CREATED SIZE <none> <none> 293e4ed402ba 2 weeks ago 315MB <none> <none> d8e4b0afd6ba 2 weeks ago 551MB

3. Make necessary edits to set the tag by using docker image tag command

docker image tag 293e4ed402ba postgres:latest docker image tag d8e4b0afd6ba wordpress:latest

Answer 6

I wrote a one-line script that importing a bunch of .tar files and immediately tagging the image.

for image in $(ls); do docker tag "$(echo $(docker import  $image))" $image ; done

Note, that you should be inside the folder when all the tar files are located.