Learn how to containerize your web applications with Docker: the core concepts, the Dockerfile, and docker-compose, explained step by step.
Docker is transforming how applications are deployed. Let's cover the basics. ## Why Docker? - Identical environments (dev/prod) - Application isolation - Reproducible deployments - Easier scalability ## Key concepts ### Images Immutable templates containing your application and its dependencies. ### Containers Executable instances created from images. ### Dockerfile A script that defines how to build an image. ## A practical example ```dockerfile FROM php:8.2-fpm WORKDIR /var/www COPY . . RUN composer install EXPOSE 9000 CMD ["php-fpm"] ``` ## Docker Compose Orchestrate multiple containers: ```yaml services: app: build: . ports: - "8080:80" db: image: mysql:8.0 ``` Docker dramatically simplifies the management of your environments.
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