Docker Desktop overview - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

Docker Desktop: Checking Running Containers

You run the command docker ps on Docker Desktop. What output do you expect if no containers are currently running?

Docker

docker ps

A Error: No containers found

B CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

C List of all containers including stopped ones

D Shows running containers with detailed logs

💡 Hint

Think about what docker ps shows by default.

The docker ps command lists only running containers. If none are running, it shows just the header row.

🧠 Conceptual

intermediate

Docker Desktop: Purpose of Docker Engine

What is the main role of the Docker Engine in Docker Desktop?

A It manages and runs containers on your machine

B It updates Docker Desktop automatically

C It stores Docker images in the cloud

D It provides the graphical user interface for Docker Desktop

💡 Hint

Think about what runs containers behind the scenes.

The Docker Engine is the core software that builds, runs, and manages containers locally.

❓ Troubleshoot

advanced

Docker Desktop: Diagnosing Network Issues

You notice containers cannot access the internet when running on Docker Desktop. Which setting is most likely causing this issue?

A Docker Desktop is running in offline mode

B Docker Engine is not installed

C Containers are running in privileged mode

D Docker Desktop's network proxy settings are misconfigured

💡 Hint

Check settings that affect container network access.

Incorrect proxy settings in Docker Desktop can block container internet access.

🔀 Workflow

advanced

Docker Desktop: Updating Docker Engine

Which sequence correctly describes how Docker Desktop updates the Docker Engine?

A 1,2,3,4

B 2,1,3,4

C 1,3,2,4

D 3,2,1,4

💡 Hint

Updates start by checking for new versions before downloading.

The update process begins by checking for updates, then downloading, installing, restarting, and verifying.

✅ Best Practice

expert

Docker Desktop: Managing Disk Space Efficiently

What is the best practice to free disk space used by Docker Desktop without losing important data?

A Restart Docker Desktop to automatically clear disk space

B Delete the entire Docker Desktop application and reinstall it

C Run <code>docker system prune -a</code> to remove all unused data including images and containers

D Manually delete files from Docker Desktop's internal folders

💡 Hint

Consider commands that clean unused Docker resources safely.

docker system prune -a safely removes unused containers, networks, images, and build cache, freeing space without affecting running containers.