Kotlin and Docker: Application Containerization

Modern software development is unthinkable without containerization. Docker has become the de facto standard for packaging, delivering, and running applications. The book "Kotlin and Docker: Application Containerization" is a practical guide that will take you from the basics to advanced techniques, allowing you to create reliable, scalable, and easily deployable Kotlin projects.

What is this book about?
The book begins with an introduction to containerization concepts and the Docker ecosystem. You will learn how to install Docker, work with images and containers, and manage network interactions. The main focus is on Kotlin: from simple console utilities to complex web applications on Ktor and Spring Boot. Each chapter contains real code examples that can be immediately applied in practice.

Key topics:

• Creating optimized Docker images for Kotlin applications (layers, multistage build, size reduction).
• Containerizing REST APIs on Ktor and Spring Boot with database connections (PostgreSQL, MongoDB).
• Orchestration with Docker Compose: configuring multi-container applications, managing dependencies and environment variables.
• Integration with CI/CD: automated building, testing, and deployment to cloud platforms (AWS, Heroku, Yandex.Cloud).
• Advanced techniques: working with Docker SDK in Kotlin, container security, monitoring, and logging.
• Migrating from Java projects to Kotlin in a Docker environment.

Who is this book for?
The book will be useful both for beginner developers who are just learning Kotlin and want to learn how to package their applications, and for experienced engineers seeking to automate deployment and adopt modern DevOps practices. If you are familiar with the basics of Kotlin and want to understand how Docker can simplify your work, this edition is for you.

What will you learn?

• How to write a Dockerfile for a Kotlin application that starts in seconds.
• How to set up local development with Docker Compose without cluttering your system.
• How to configure GitHub Actions for automatic building and publishing of images.
• How to debug containers and solve typical network and memory issues.
• How to design a microservice architecture on Kotlin with Docker.

The book is written in simple language, contains many screenshots, diagrams, and code listings. All examples are available in a GitHub repository. After reading, you will be able to confidently use Docker in any Kotlin project — from a hobby application to an enterprise system.