https://dileepkumar.dev/tags/docker/ Recent content in docker on Dileep Kumar https://dileepkumar.dev/papermod-cover.png https://dileepkumar.dev/papermod-cover.png Hugo -- gohugo.io en Tue, 14 Jan 2025 00:08:00 +0530 https://dileepkumar.dev/post/docker-commands-cheatsheet/ Tue, 14 Jan 2025 00:08:00 +0530 https://dileepkumar.dev/post/docker-commands-cheatsheet/ Introduction This cheatsheet provides a quick reference for the most common Docker commands. Getting Started # Run a test image to verify installation docker run hello-world # Display system-wide information docker info # Display Docker version information docker version Image Management # List all images docker images ls # Pull an image from a registry (Docker Hub by default) docker image pull alpine # Push an image to a registry docker image push your-username/your-image # Build an image from a Dockerfile # -t tags the image with a name docker image build -t my-app . https://dileepkumar.dev/post/docker-configuration-and-security/ Tue, 14 Jan 2025 00:07:00 +0530 https://dileepkumar.dev/post/docker-configuration-and-security/ Introduction Properly configuring Docker is essential for both security and functionality, especially in enterprise and production environments. This comprehensive guide covers critical configuration scenarios, security hardening techniques, and best practices for running Docker safely in production. We’ll explore proxy configuration, registry trust management, security scanning, resource limits, and the principle of least privilege—all essential for production-ready Docker deployments. Part 1: Configuring Docker for Corporate Networks Understanding the Proxy Challenge In corporate environments, direct internet access is often restricted. https://dileepkumar.dev/post/dockerfile-best-practices/ Tue, 14 Jan 2025 00:06:00 +0530 https://dileepkumar.dev/post/dockerfile-best-practices/ Introduction A Dockerfile is the blueprint for building Docker images. It’s a text file containing a series of instructions that Docker reads from top to bottom to assemble an image. Understanding how to write efficient, secure, and maintainable Dockerfiles is fundamental to mastering Docker. This comprehensive guide takes you from Dockerfile basics to advanced optimization techniques, covering every instruction, when to use it, and best practices for production-ready images. https://dileepkumar.dev/post/docker-content-transfer-and-data-management/ Tue, 14 Jan 2025 00:05:00 +0530 https://dileepkumar.dev/post/docker-content-transfer-and-data-management/ Introduction While volumes and bind mounts are the primary methods for persistent data in Docker, there are times when you need to quickly copy files between your host machine and a running or stopped container. This is where the docker cp command becomes invaluable. This comprehensive guide covers everything about transferring content with Docker, from basic file copying to advanced data management strategies, troubleshooting, and best practices. Why You Need docker cp Common Use Cases: https://dileepkumar.dev/post/docker-registry-setup-and-management/ Tue, 14 Jan 2025 00:04:00 +0530 https://dileepkumar.dev/post/docker-registry-setup-and-management/ Introduction While Docker Hub is excellent for public images, production environments require private registries for proprietary applications. A private Docker registry gives you complete control over your container images, their storage location, access permissions, and distribution. This comprehensive guide covers everything from running a basic local registry to implementing production-grade solutions with authentication, TLS encryption, and high availability. Why Run a Private Docker Registry? Security and Compliance: Keep proprietary code and sensitive applications off public registries Meet regulatory requirements for data sovereignty Control who can access your images with fine-grained permissions Scan images for vulnerabilities before deployment Performance and Reliability: https://dileepkumar.dev/post/docker-swarm-and-services/ Tue, 14 Jan 2025 00:03:00 +0530 https://dileepkumar.dev/post/docker-swarm-and-services/ Introduction You’ve mastered single containers with docker run and multi-container applications on a single host with Docker Compose. But what happens when your application needs to scale beyond one machine? What if you need high availability, automatic failover, and load balancing across multiple servers? This is where container orchestration comes in, and Docker Swarm is Docker’s native solution. Swarm transforms a pool of Docker hosts into a single, virtual Docker host, allowing you to deploy and manage containerized applications at scale. https://dileepkumar.dev/post/docker-compose-mastery/ Tue, 14 Jan 2025 00:02:00 +0530 https://dileepkumar.dev/post/docker-compose-mastery/ Introduction So far, we’ve dealt with single containers. But real-world applications are rarely that simple. They are often composed of multiple, interconnected services: a web server, a database, a caching layer, a message queue, and more. Managing the lifecycle, networking, and data for all these separate containers with individual docker run commands would be a nightmare. This is the problem that Docker Compose solves. It is an essential tool for defining and running multi-container Docker applications. https://dileepkumar.dev/post/docker-volumes-and-bind-mounts/ Tue, 14 Jan 2025 00:01:00 +0530 https://dileepkumar.dev/post/docker-volumes-and-bind-mounts/ Introduction A core principle of Docker is that containers should be ephemeral and stateless. This means that any data created inside a container’s writable layer is lost forever when the container is removed. While this is great for creating predictable and clean environments, it poses a significant challenge for any application that needs to save data—like databases, user uploads, or logs. To solve this, Docker provides three primary mechanisms for getting data into and out of containers: Volumes, Bind Mounts, and tmpfs mounts. https://dileepkumar.dev/post/docker-images-and-containers-complete-guide/ Tue, 14 Jan 2025 00:00:00 +0530 https://dileepkumar.dev/post/docker-images-and-containers-complete-guide/ Introduction Welcome to the world of Docker! This comprehensive guide is your first step into containerization. We will explore the absolute fundamentals: Dockerfiles, Images, and Containers. Understanding these three core components is the key to mastering Docker. By the end of this guide, you will not only have built and run your first containerized application but also grasped the “why” behind each step. We’ll build a simple Python Flask web application from scratch, package it into a portable Docker image, and run it as an isolated container on your local machine.