Docker

Docker Compose is a tool for defining and running multi-container Docker applications that uses YAML files to configure application services, allows you to create and start all services with a single command, ensures consistency between development and production environments, and simplifies the management of complex multi-container architectures. Docker Compose Overview What is Docker Compose? Docker Compose is a tool for defining, running, and managing applications composed of multiple containers. It allows you to declaratively define services, networks, and volumes in a docker-compose.yml file and manage the entire application stack with a single command. ...

Docker image optimization is a core technology that directly impacts build time reduction, deployment speed improvement, storage cost savings, and security vulnerability reduction for container-based applications. By applying techniques such as appropriate base image selection, multi-stage builds, and layer optimization, you can reduce image size by 10x or more, which also significantly affects CI/CD pipeline efficiency and cloud infrastructure costs. Understanding Docker Image Size Problems Why is Image Size Important? ...

Docker is a platform for developing, deploying, and running container-based applications. It uses Linux kernel namespaces and cgroups to run applications in isolated environments. This guide explains the step-by-step process of installing Docker and running your first container on Ubuntu Linux. Docker Installation Requirements Docker Installation Requirements Docker Engine runs on 64-bit Linux systems and requires kernel version 3.10 or higher. For Ubuntu, versions 20.04 LTS, 22.04 LTS, and 24.04 LTS are officially supported. ...

Container technology is a revolutionary innovation that has fundamentally transformed modern software development and deployment. Docker is the key platform that popularized this container technology, and since its introduction in 2013, it has become the standard for microservices architecture, CI/CD pipelines, and cloud-native computing. History of Container Technology and the Birth of Docker What is a Container? A container is a lightweight virtualization technology that packages an application along with all its dependencies (libraries, configuration files, binaries, etc.) into a single standardized package, enabling identical execution anywhere. ...

Packaging React applications as Docker containers maintains consistency between development and production environments, facilitates integration with CI/CD pipelines, enables using the same image across various deployment environments (Kubernetes, AWS ECS, Azure Container Instances, etc.) to standardize deployment processes, and allows creating optimized production images through multi-stage builds and nginx-based static file serving. Understanding React Application Containerization Why Containerize React Apps? React is a client-side JavaScript application that, after building, is bundled into static files (HTML, CSS, JavaScript) and served through a web server. Using Docker containers ensures build environment consistency, enables deployment automation, and simplifies environment-specific configuration management. ...

Docker image layers are the fundamental building blocks of Docker images. Each layer captures filesystem changes and stacks as a read-only tier on top of previous layers. These layers are unified into a single filesystem through the Union File System and provided to containers. Understanding the layer structure is essential for efficient image building and storage optimization. Docker Image Layer Overview What is a Docker Image Layer? A Docker image layer is a filesystem snapshot generated by each instruction in a Dockerfile. Like Git commits, it stores only the changes from the previous state, maximizing space efficiency. ...

Linux container technology has steadily evolved since the first introduction of mount namespace in kernel 2.4.19 in 2002 to become a core foundation of modern cloud infrastructure, with Namespaces handling process isolation and Cgroups (Control Groups) handling resource control at its center. All container runtimes including Docker, Kubernetes, and Podman leverage these two kernel features to provide isolation environments that are much lighter and faster than virtual machines, and understanding them is the first step to deeply grasping container technology. ...