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Pushing Images

Docker Documentation References:

docker push

docker login

docker tag

docker images

Intent

The purpose of this kata is to familiarize yourself with the process of pushing a Docker Image to a shared repository (Docker HUB).

Overview

In this exercise, we will login, tag, push an image to the Docker Hub repository, and then list out images.

Please note that the image you push here cannot be deleted via the CLI from the remote repository, you will need to use the tools provided by the repository to remove the image. Also note, Azure's Container Registry does not support delete, so if you push an image there you are stuck with it.

Kata Steps

Login

Command

docker login --username rdammkoehler --password *******************

Note: By default the login command logs you into https://index.docker.io/v1/ however you can specify an alternate server in this location. The configuration of available servers (servers you have used before) is stored at $HOME/.docker/config.json

Output

thought:DockerKata rich$ docker login --username rdammkoehler --password *******************
Login Succeeded

Tag the Image

Command

docker tag nginx:alpine rdammkoehler/nginx:docker_kata

Note: the use of mine as a tag is a totally arbitrary value for demonstration purposes

Output

thought:DockerKata rich$ docker tag nginx:alpine rdammkoehler/nginx:docker_kata

Push an Image

Command

docker push rdammkoehler/nginx:docker_kata

Output

thought:DockerKata rich$ docker push rdammkoehler/nginx:docker_kata
The push refers to a repository [docker.io/rdammkoehler/nginx]
c179fee9afab: Mounted from library/nginx
5b9c3a4ab3e9: Mounted from library/nginx
b7959b8fc470: Mounted from library/nginx
e154057080f4: Mounted from library/nginx
docker_kata: digest: sha256:33eb1ed1e802d4f71e52421f56af028cdf12bb3bfff5affeaf5bf0e328ffa1bc size: 1153

List Images

Command

docker images

Output

thought:DockerKata rich$ docker images
REPOSITORY                                   TAG                 IMAGE ID            CREATED             SIZE
nginx                                        alpine              f00ab1b3ac6d        2 weeks ago         15.5 MB
rdammkoehler/nginx                           docker_kata         f00ab1b3ac6d        2 weeks ago         15.5 MB

Note: There is no CLI for deleting an image from a remote repository at this time. So using docker rmi will remove the image from your local repository and /or untag the remote image but it does not actually remove the image from the remote repository. In order to do that you need to visit the repository and determine how it works for that specific repo.

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