1: History and Motivation
Examine the evolution of virtualization technologies from bare metal, virtual machines, and containers and the tradeoffs between them.
2: Technology Overview
Explores the three core Linux features that enable containers to function (cgroups, namespaces, and union filesystems), as well as the architecture of the Docker components.
3: Installation and Set Up
Install and configure Docker Desktop
4: Using 3rd Party Container Images
Use publicly available container images in your developer workflows and learn how about container data persistence.
5: Example Web Application
Building out a realistic microservice application to containerize.
6: Building Container Images
Write and optimize Dockerfiles and build container images for the components of the example web app.
7: Container Registries
Use container registries such as Dockerhub to share and distribute container images.
8: Running Containers
Use Docker and Docker Compose to run the containerized application from Module 5.
9: Container Security
Learn best practices for container image and container runtime security.
10: Interacting with Docker Objects
Explore how to use Docker to interact with containers, container images, volumes, and networks.
11: Development Workflow
Add tooling and configuration to enable improved developer experience when working with containers.
•Developer Experience Wishlist
12: Deploying Containers
Deploy containerized applications to production using a variety of approaches.
Container Registry Overview
A container registry is a repository or a collection of repositories used to store and access container images. These registries are generally stored in the cloud and allow you to push built images and pull them into your deployment environment. Container registries can be either public or private. Some popular container registries include Docker Hub, GitHub Container Registry, and those provided by Google, Amazon, and Azure.
TODO: INSERT_IMAGE
Authentication and Pushing Images
To push an image to a remote repo, you need to:
- Authenticate to the repo
- Tag the image with a tag corresponding to the repo
Each registry will have its own set of instructions for logging in. The process will generally involve using a command like docker login and providing your credentials.
Example: Pushing to Docker Hub
- Authenticate with Docker Hub:
docker login
- Tag your image with your Docker Hub username and the repository name:
docker tag my_scratch_image:latest myusername/my_scratch_image:latest
- Push the image to DockerHub:
docker push myusername/my_scratch_image:latest
Example: Pushing to GitHub Container Registry
- Authenticate with GitHub Container Registry:
echo "TOKEN" | docker login ghcr.io -u USERNAME --password-stdin
- Tag your image with the registry prefix, your GitHub username, and the repository name:
docker tag my_scratch_image:latest ghcr.io/myusername/my_scratch_image:latest
- Push the image to GitHub Container Registry:
docker push ghcr.io/myusername/my_scratch_image:latest
Tagging Best Practices
- Avoid using the latest tag, and instead use descriptive tags for your images.
- The same image can have multiple tags, so use tags that are useful for the end user.
- Treat tags as immutable, except for temporary tags used for development.
- Common tag elements include timestamps, build IDs, commit hashes, and semver release versions.