Choosing small base images (alpine, slim) in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a base image in Docker?

A base image is the starting point for building a Docker image. It contains the basic operating system or runtime environment on which you add your application and dependencies.

beginner

Why choose small base images like Alpine or Slim?

Small base images reduce the final image size, which means faster downloads, less storage use, and quicker startup times for containers.

beginner

What is Alpine Linux in the context of Docker images?

Alpine Linux is a very small, security-focused Linux distribution often used as a minimal base image in Docker to keep images lightweight.

intermediate

What does the 'slim' tag mean in Docker base images?

The 'slim' tag indicates a smaller version of a base image that removes unnecessary files and tools but keeps compatibility with most applications.

intermediate

What is a trade-off when using Alpine as a base image?

Alpine images are very small but may require extra work to install some libraries or tools because it uses a different package manager and libc implementation.

Which of these is a benefit of using Alpine as a Docker base image?

A Smaller image size

B Includes all development tools by default

C Uses the same package manager as Ubuntu

D Always the fastest runtime

Alpine is known for its small size, which helps reduce image size and download time.

What does the 'slim' tag usually indicate in Docker images?

A A larger image with extra tools

B An image with debugging enabled

C An image based on Alpine Linux

D A smaller image with unnecessary files removed

The 'slim' tag means the image is smaller by removing unnecessary files but keeps compatibility.

What is a common challenge when using Alpine images?

A They are very large

B They use a different libc and package manager

C They do not support containers

D They come with too many pre-installed tools

Alpine uses musl libc and apk package manager, which can cause compatibility issues.

Why might you choose a 'slim' image over Alpine?

A For better compatibility with common libraries

B Because it is always smaller than Alpine

C Because it uses musl libc

D Because it has no package manager

'Slim' images keep compatibility with common libraries while reducing size.

What is the main reason to use small base images in Docker?

A To increase container startup time

B To avoid using any package manager

C To reduce image size and speed up deployment

D To include more software by default

Smaller images reduce download time and storage, making deployments faster.

Explain the benefits and trade-offs of using Alpine as a Docker base image.

Think about size, security, and compatibility.

Describe what the 'slim' tag means for Docker base images and when you might choose it.

Consider size and compatibility trade-offs.