Ref: https://learn.cantrill.io/courses/docker-fundamentals/lectures/44151210 =OR= https://www.youtube.com/watch?v=m2sT-z_A_Ys

DEMO: https://learn.cantrill.io/courses/docker-fundamentals/lectures/44151211 =OR= https://www.youtube.com/watch?v=fvFknCRf1W0 → GitHub: https://github.com/acantril/docker-fundamentals/blob/main/docker-registry/instructions.md

• Summary:
• Contents:

What is a Container Registry?

• 💡 Similar to GitHub, but instead of Git repositories it stores container images
• Docker Hub
  • Most popular container registry
  • Public registry
    • can be accessed from public internet
    • images can be public (shared with everyone) or private (only you)
  • 🔧 Stores Docker images in repositories

Pulling and pushing images from/to Docker Hub

• Pull image from Docker Hub: docker pull acantril/containerofcats:latest
  • acantril - Docker Hub user name
  • containerofcats - image repo
  • latest - image tag
• Push image to Docker Hub:
  1. You must be a Docker Hub user first (register if you're not)
  2. docker login --username=<user_name> - login to Docker Hub
  3. docker tag <img_id> <user_name>/<repo_name>:<tag>
     • creates a new image with specified tag, ready to be pushed to Docker Hub
  4. docker push <user_name>/<repo_name>:<tag> - push the image to Docker Hub
     • you can verify that image is visible in Docker Hub
• 💡 The imageID of a Docker image is a small subset of an overall digest. The digests determine how registries interact with images and their tags/versions.