Summary - Image management

Combine pull, tag, push and rmi to manage the image lifecycle.

Summary: image management

In this group:

docker images lists local images; <none> is a dangling image.
docker rmi deletes; it's refused if a container uses the image. image prune (-a) cleans in bulk.
docker pull downloads in layers; --platform and digests are supported.
For docker push, the name must include the account/registry and docker login must be done.
docker tag adds a new name; save/load move images without a registry.

docker pull nginx:alpine
docker tag nginx:alpine ali/nginx:alpine
docker push ali/nginx:alpine
docker image prune -f

Exercise Release a version

Write four commands: tag the api:3.0.0 image as ali/api:3.0.0 and ali/api:latest (two commands); push all tags of the ali/api repository; clean up dangling images without confirmation.

Show example solution

docker tag api:3.0.0 ali/api:3.0.0
docker tag api:3.0.0 ali/api:latest
docker push --all-tags ali/api
docker image prune -f

Test yourself

What is the way to move an image to a server without internet access?
- docker tag
- Write to tar with docker save and docker load on the server
- docker push
- docker pull
Show answer

Write to tar with docker save and docker load on the server — The tar file can be moved any way (scp, USB).

Load the image from a tar file.

docker load ____ api.tar

Show answer

docker load -i api.tar

Match.

pull

Download
push

Upload
rmi

Delete
prune

Bulk clean

Next lesson: The port concept

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