Registry
A registry stores Docker images so they can be downloaded again later.
Lesson 15
Docker Hub and registries
This page explains how Docker images are named, tagged, pushed, pulled, and shared with registries like Docker Hub.
Docker Hub
Docker Hub is the most common public registry beginners use for official images and shared project images.
Why it matters
Without pushing to a registry, your image usually stays local to one machine only.
Basic push flow
docker build -t my-app .
docker tag my-app yourname/my-app:1.0
docker push yourname/my-app:1.0Basic pull flow
docker pull yourname/my-app:1.0Another machine can now download the same image version and run it.
Important commands
docker logindocker tagdocker pushdocker pull
Common mistakes
- Forgetting to tag the image correctly before push
- Using unclear tags
- Assuming a local image already exists on another machine
- Depending too much on `latest` instead of clear versions
Next page: Lesson 16 covers Docker security basics before the final Phase 2 lesson on development vs production setup.