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Docker 101: Publish a PostgreSQL Container Port on Localhost Only
Learn how to keep a database available to an app running on your workstation without exposing its port to other machines on the network.
Challenges
Focused, hands-on problems for sharpening your DevOps and server-side skills. Some teach specific concepts while others mirror real-world scenarios. Every challenge includes hints, feedback, and automated solution checks.
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Docker 101: Publish a Container Port to Access the App from the Host
A web app is listening inside a container, but the browser can't reach its IP address. Recreate the container so the app is available on port 80 of the Docker host.
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Docker 101: Authenticate to Private Container Registries
Practice using docker login to authenticate against multiple private container registries with different credentials, then pull and push images across them.
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Docker 101: Tag and Push Container Images to Registries
Re-tag local container images with fully-qualified references and publish them to different registries using the 'docker tag' and 'docker push' commands.
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Docker 101: Pull a Container Image for a Specific Platform
Pull a container image built for a non-native CPU architecture using the 'docker pull --platform' flag.
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Docker 101: Pull a Container Image by Digest
Practice pulling a container image using an immutable digest reference instead of a mutable tag.
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Docker 101: Pull Container Images from Different Registries
Pull container images using the 'docker pull' command and explore how the image name determines its source registry and repository.
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Write a Dockerfile That Excludes Dev Dependencies from the Production Image
Learn how to keep your container images lean by excluding development dependencies (linters, test frameworks, etc.) from the production build.
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Write a Dockerfile for an Application With System-Level Dependencies
Practice installing OS-level packages during a Docker image build to satisfy system library requirements of your application.
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Write Your First Dockerfile
Learn the absolute basics of Dockerfile authoring by containerizing a simplistic Node.js server application with just three instructions: FROM, COPY, and CMD.