Challenge on ,
Docker 101: Publish All Exposed Ports on Random Host Ports to Avoid Port Conflicts
Can you get several builds of an app running side by side without port conflicts, so you can test them simultaneously?
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.
Challenge on , ,
Docker 101: Publish a Redis Container Port on the Private Network Only
A common setup for small deployments: two servers (VM or bare-metal), each with a public and a private IP. The app listens on the public port but wants to talk to Redis over the private network. Can you set it up?
Challenge on ,
Docker 101: Reach a Container Without Publishing a Port
Practice accessing a containerized service directly from the Docker host using its IP address.
Challenge on ,
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.
Challenge on ,
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.
Challenge 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.
Challenge 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.
Challenge 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.
Challenge on
Docker 101: Pull a Container Image by Digest
Practice pulling a container image using an immutable digest reference instead of a mutable tag.
Challenge 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.