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Day 11: Docker Registries & Distribution

Concepts:

  • Image Registries: Centralized repositories for storing and sharing Docker images (e.g., Docker Hub, Google Container Registry, AWS ECR, GitLab Container Registry, private registries).
  • docker login: Authenticating with a registry.
  • docker tag: Tagging images with repository names and versions for pushing.
  • docker push: Uploading images to a registry.
  • docker pull: Downloading images from a registry.
  • Image Security: Brief mention of image scanning, content trust (Docker Notary).

Examples:

  1. Login to Docker Hub:
docker login

(Enter your Docker Hub username and password.)

  1. Tag your optimized image from Day 10:
docker tag my-flask-app-optimized <your_dockerhub_username>/my-flask-app:1.0

(Replace <your_dockerhub_username> with your actual Docker Hub username.)

  1. Push the image to Docker Hub:
docker push <your_dockerhub_username>/my-flask-app:1.0

(This might take some time depending on your internet connection and image size.)

  1. Verify on Docker Hub website: Log in to Docker Hub in your browser and confirm that your repository and image are visible.

  2. Pull your image from Docker Hub (simulate on a new machine or after local removal):

docker rmi <your_dockerhub_username>/my-flask-app:1.0 # Remove local copy first
docker pull <your_dockerhub_username>/my-flask-app:1.0
docker run -p 8080:5000 <your_dockerhub_username>/my-flask-app:1.0

(Access http://localhost:8080 to verify.)

Challenge 11: Share Your Work

  • Push your optimized Flask application image from Day 10 to your Docker Hub account with a new tag (e.g., v2.0).
  • In a separate terminal or on another machine if possible, pull this new image.
  • Run a container from the pulled image and verify it works as expected.
  • (Optional) If you have a friend learning Docker, share your image name and ask them to try pulling and running it!