This blog post does contain the tasks to create a Docker image and upload the image to dockerhub and clean up the image and container on the local machine.
Upload the image
1. Create a local Docker image using docker build
- Dockerhub account name: tsuedbroecker
- Dockerhub repository name: cns-workshop-tools
- Tag: v4
- Docker image name with tag: tsuedbroecker/cns-workshop-tools:v4
docker build -t "tsuedbroecker/cns-workshop-tools:v4" .
Example: If your Dockerfile has a different name or is in a different folder.
docker build -t "tsuedbroecker/cns-workshop-tools:v4" -f "build/Dockerfile" .
2. Run the Docker image as a container
Using docker run
with the interactive terminal mode parameter -it to verify the content of your Docker image you just created.
For example: Check different CLI versions like the IBM Cloud CLI inside the running container of your image.
Container name: demo
Docker image name: tsuedbroecker/cns-workshop-tools:v4
docker run -it --name demo "tsuedbroecker/cns-workshop-tools:v4" /bin/bash
Here an example to verify a installed IBM Cloud CLI:
root@dbe62179b56a:/tmp# ibmcloud version
ibmcloud version 1.2.3+3577aee6-2020-09-25T14:34:09+00:00
root@dbe62179b56a:/tmp#
Note: Maybe you also want to mount a path from your local machine
docker run -it --privileged --name demo -v "$(pwd)":/localmachine "tsuedbroecker/cns-workshop-tools:v4" /bin/bash
3. Login to container registry
In our case the container registry is Dockerhub (other container registry example: docker login quay.io)
docker login
4. Push the Docker image to Dockerhub
docker push tsuedbroecker/cns-workshop-tools:v4
5. Verify at the image was uploaded to Dockerhub

Clean up
1. Show the existing running Docker containers
docker ps --all
Example output:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dbe62179b56a tsuedbroecker/cns-workshop-tools:v4 "/bin/bash" 15 minutes ago Exited (127) 12 minutes ago demo
Note: Stop all running container docker kill $(docker ps -a -q)
2. Delete a running container
Copy the CONTAINER ID and delete the running container with docker rm
docker rm dbe62179b56a
Example output
dbe62179b56a
Note: Remove all running container docker rm $(docker ps -a -q)
3. List the existing container images
docker image list
Example output:
REPOSITORY TAG IMAGE ID CREATED SIZE
tsuedbroecker/cns-workshop-tools v4 ff088202f1dc 31 minutes ago 925MB
ubuntu latest d70eaf7277ea 5 days ago 72.9MB
c18da3b7a242 5 months ago 206MB
4. Remove the container image
Copy the image repository name and tag and delete the image with docker image rm.
- Image name: tsuedbroecker/cns-workshop-tools
- Tag: v4
docker image rm tsuedbroecker/cns-workshop-tools:v4
Note: You can delete all images with docker image prune -a
docker system prune --all --force && docker rmi --all
I hope this was useful for you and let’s see what’s next?
Greetings,
Thomas
#Container, #Docker, #podman
Hi thomas, thanks for this post! In this way is possible to save local disk space by moving all images in docker hub? I’m having problem with all docker images that even if they’re not running, are growing in usage disk space!
Thanks a lot
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Hi Daniele, typically, you delete all container images that you don’t use on your computer and only upload container images that you need or want to share in a container registry. It’s really very unusual what you’re about to do, but nobody can stop you from doing it. Maybe you can take a look again in the options in the CLEAN UP section of the blog post or just search for delete local container images. I hope this helps a bit maybe I don’t get what you are saying. Greetings Thomas
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