Challenge, Easy, on
List All Tags in a Container Repository
Practice discovering what has been published to a remote container repository by listing its tags using crane, regctl, or a direct call to the registry HTTP API.
Submissions: 85/116
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.
Customize nginx Startup Behavior with a postStart Lifecycle Hook
by Omkar Shelke
Create a Pod that uses a postStart lifecycle hook to write a custom message to the nginx welcome page, expose it via a NodePort Service, and verify the hook ran successfully.
Submissions: 31/33
Challenge, Easy, on
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.
Submissions: 132/146
Mount Static Assets from an OCI Image into a Kubernetes Pod
Use Kubernetes image volumes to mount a static HTML artifact into an nginx Pod without an init container or a custom nginx image.
Submissions: 170/250
Challenge, Easy, on
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.
Submissions: 135/162
Challenge, Easy, on
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.
Submissions: 143/158
Challenge, Easy, on
Docker 101: Pull a Container Image by Digest
Practice pulling a container image using an immutable digest reference instead of a mutable tag.
Submissions: 150/169
Challenge, Easy, on
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.
Submissions: 198/219
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.
Submissions: 207/270
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.
Submissions: 182/217