Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 77“Production-grade backends”

Docker Fundamentals

Docker packages your app + its runtime into an immutable image that runs the same on every machine.

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Focus

2 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Docker packages your app + its runtime into an immutable image that runs the same on every machine. The mental model: image = recipe, container = running instance.

Informative example

bash

# Common commands
docker build -t acme/orders:1.0.0 .
docker run --rm -p 8080:8080 -e SPRING_PROFILES_ACTIVE=dev acme/orders:1.0.0
docker logs -f <container>
docker exec -it <container> sh
docker compose up -d        # multi-container dev

# Image best practices
- multi-stage build (small final image)
- non-root user
- pin base image version (eclipse-temurin:21.0.4_7-jre)
- .dockerignore to exclude target/, .git, node_modules

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