Dockerfile Best Practices

Summary

The instructions for building a Docker image — writing an efficient, secure Dockerfile involves minimizing layers, using specific base image versions, and not running as root by default.

• 1Write a Dockerfile for a simple application and build an image from it.
• 2Learn why pinning a specific base image version (not `latest`) matters for reproducibility.
• 3Practice reducing image size by cleaning up unnecessary files in the same layer they were created.