Docker Documentation

This guide introduces Docker containerization fundamentals, focusing on concepts and best practices for developers using the Codeunia Learn platform.

Overview

Docker enables packaging applications with dependencies into portable containers. It simplifies deployment, scaling, and environment consistency across development and production.

Docker Fundamentals

Images

Read-only templates for containers, built from Dockerfiles.

Containers

Runnable instances of images, isolated environments.

Dockerfile

Script defining image build steps.

Docker Compose

Tool for defining multi-container applications.

Basic Commands

• docker build: Build image from Dockerfile.
• docker run: Create and start container.
• docker ps: List containers.
• docker images: List images.
• docker stop: Stop container.
• docker rm: Remove container.

Volumes

Persist data beyond container lifecycle.

Networks

Connect containers for communication.

Best Practices

Use multi-stage builds, minimize image layers, and secure containers.

Orchestration

Kubernetes manages container clusters at scale.

Resources and References

• Docker Documentation
• Docker Compose
• Docker Hub

Troubleshooting

Common issues include port conflicts, image build failures, and networking problems. Use docker logs for debugging.

Development Setup

Install Docker Desktop, write Dockerfiles, and integrate with CI/CD.