How to delete a docker image

Question

A Dockerfile is included in my project to create an image. I've tweaked that Dockerfile and want to verify whether it still works. So I quit my program and used docker image ls -a in Powershell to list all of my Docker images. Using docker rmi -f $(docker images -a -q) and docker image prune -a and  I deleted all unnecessary images.

However, instead of being erased, the image is merely 'untagged':

Untagged: my_image:latest
Untagged: my_image@sha256:16eb92a476be0...

Before attempting to erase the picture, all containers are stopped and removed.
When I restart my application to create a new image, it continues to use the old one:

> docker image ls -a
REPOSITORY                     TAG           IMAGE ID            CREATED      
/my_image                      latest        0d79904a74b0        1 months ago

How can I physically delete the old image so that my app can create a fresh one?

Answer 1

To begin, you must first delete or stop the container that is currently using your image (which one you want to remove).

To see all the running containers on your machine, type docker ps -a.
docker stop container_id: This command is used to terminate a running container.
docker rm container_id: To delete or remove a docker container (only if it stopped).
To get a list of all accessible images, including their tag, image id, creation time, and size, run docker image ls.
To delete a specific image, run rmi docker image_id.

To destroy a specific image, run docker image rm image_name.
To remove the image, you must first remove or stop all containers that use it.

docker system prune -a: Removes all containers and images from the Docker environment.