Docker for developers

Short summary

Docker packages applications with their runtime, libraries, and dependencies into portable containers that run identically across development, CI, and production. Key practices include ordering Dockerfile instructions from least to most frequently changing for cache efficiency, using multi-stage builds with minimal base images, and leveraging Docker Compose to define multi-service stacks. Adopting Docker eliminates environment drift and simplifies developer onboarding to a single command.

• •Images are blueprints; containers are running instances sharing the host kernel for speed
• •Order Dockerfile layers least-to-most changing to maximize build cache reuse
• •Docker Compose lets new developers run the full stack with one command

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