Typorithm · easy

Build, Tag & Push

docker-builddevopsbuildtagregistry

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Full lesson · 8 learning steps Open any exercise for focused practice

Step 1 of 8 · intro card

Learn Build, Tag & Push

Images

docker build turns a Dockerfile into an image and -t names and tags it; tag again for a remote registry path; push uploads it to a registry like Docker Hub, ECR, or GHCR. Images are content-addressed layers shared across tags, and the target host pulls them.

docker build reads the Dockerfile and build context (the trailing . is the context directory) and produces an image. The -t flag names and tags it, like myapp:1.0.

To publish to a remote registry, tag the image with the registry path: docker tag adds a second name for the same underlying image. The original tag is unchanged.

docker push uploads the layers to a registry such as Docker Hub, ECR, or GHCR. Because images are content-addressed layers, only layers the registry lacks are sent, and any host can later pull them.

docker build -t names and tags the image.

docker tag adds another name for the same image.

docker push uploads layers to a registry.

docker build -t myapp:1.0 .
docker tag myapp:1.0 registry/myapp:1.0
docker push registry/myapp:1.0
docker images

Read the implementation

Connect each part of the code to the concept before you type.

1. Build the image

docker build runs the Dockerfile in the current context and -t names and tags the result.

docker build -t myapp:1.0 .

2. Retag for registry

docker tag adds a second name pointing at the same image, here a remote registry path.

docker tag myapp:1.0 registry/myapp:1.0

3. Push to registry

docker push uploads the tagged image's layers to the registry so other hosts can pull it.

docker push registry/myapp:1.0

4. List images

docker images lists the local images with their tags, sizes, and IDs.

docker images

A complete learning loop

Understand

Read the concept map and follow the code breakdown.

Reconstruct

Type the implementation, repair mistakes and work through every recall exercise.

Verify

Use the final check without hints; revisit weak concepts in short practice sessions.