Distroless images concept in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a distroless image in Docker?

A distroless image is a minimal Docker image that contains only the application and its runtime dependencies, without any operating system shell or package manager.

beginner

Why are distroless images considered more secure?

Because they exclude shells and package managers, reducing the attack surface and limiting what an attacker can do if they gain access to the container.

beginner

How do distroless images affect the size of Docker containers?

Distroless images are smaller because they remove unnecessary OS components, which helps reduce the container size and speeds up deployment.

beginner

Can you run shell commands inside a distroless container?

No, distroless images do not include a shell, so you cannot run shell commands inside the container.

beginner

What is a common use case for distroless images?

They are commonly used in production environments where security and small image size are important, especially for microservices and cloud-native applications.

What is missing from a distroless Docker image compared to a traditional base image?

A Operating system shell and package manager

B Application runtime

C Network support

D Container runtime

Distroless images remove the OS shell and package manager to reduce size and improve security.

Why might you choose a distroless image for your container?

A To include development tools

B To have a full Linux environment inside the container

C To enable easy debugging with shell access

D To reduce image size and improve security

Distroless images focus on minimal size and security, not on providing a full OS or debugging tools.

Which of the following is true about distroless images?

A They include a bash shell by default

B They are larger than traditional images

C They contain only the app and its runtime dependencies

D They are only used for development

Distroless images contain only the application and necessary runtime dependencies.

If you need to debug inside a container, what is a limitation of distroless images?

A They lack a shell to run commands

B They cannot run applications

C They do not support networking

D They are read-only

Distroless images do not include a shell, so you cannot run interactive commands inside.

Which scenario best fits using a distroless image?

A Developing and testing new features interactively

B Running a secure, lightweight production service

C Building a full Linux desktop environment

D Running containers that require package installation at runtime

Distroless images are ideal for secure, lightweight production deployments.

Explain what a distroless image is and why it is useful in Docker container deployments.

Think about what is removed from the image and the benefits it brings.

Describe the trade-offs when using distroless images compared to traditional Docker base images.

Consider what you gain and what you lose.