Go (Golang) and Docker: Application Containerization

This book is a practical guide to containerizing applications in Go (Golang) using Docker. It is intended for developers who want to master the modern approach to packaging, delivering, and deploying software.

What the book covers:

• Docker basics and its ecosystem: images, containers, Dockerfile, docker-compose.
• Specifics of containerizing Go applications: compiling into a static binary, creating minimal images (scratch, alpine).
• Multi-stage builds to reduce image size.
• Working with networks and data: Docker networks, volumes, bind mounts.
• Orchestrating Go microservices with docker-compose.
• Container security: best practices, running as a non-privileged user.
• Integration with CI/CD (GitHub Actions, GitLab CI) for automated testing and deployment.
• Monitoring and logging of containerized applications.

Who this book is for:

• Go developers looking to automate the deployment of their applications.
• DevOps engineers working with the Golang stack.
• Students and professionals learning modern containerization practices.
• Anyone who wants to migrate their Go projects to Docker without unnecessary theory.

What you will learn and be able to do:

• Write efficient Dockerfiles for Go applications with a minimal final size.
• Set up a local development environment with Docker Compose.
• Package Go web services, CLI utilities, and microservices into containers.
• Manage configuration and secrets using environment variables and Docker secrets.
• Automate the build and publication of images to Docker Hub or a private registry.
• Deploy containerized Go applications on a server (VPS, cloud) using Docker.
• Apply the "one responsibility per container" and "sidecar" patterns.
• Optimize build time and layer caching.

The book contains many ready-made code examples, step-by-step instructions, and real-world scenarios. You will start with the basics of Docker and Go, and by the end, you will be able to independently build a production-ready infrastructure for your projects.

All examples have been tested with the latest versions of Go 1.21+ and Docker 24+. Regardless of your current level, you will find useful practices and techniques here that can be immediately applied in your work.

Dive into the world of Go application containerization and make your development and deployment process fast, reliable, and reproducible!