Getting Started with Docker for DevOps

Docker has revolutionized the way we build, ship, and run applications. In this guide, we will walk through the fundamentals of Docker and how it fits into a modern DevOps workflow.

What is Docker?

Docker is a platform for developing, shipping, and running applications inside lightweight containers. Containers package an application with all its dependencies, ensuring consistency across environments.

Key Concepts

• Images - Read-only templates for creating containers
• Containers - Running instances of images
• Dockerfile - Instructions to build an image
• Docker Compose - Multi-container orchestration

Basic Commands

# Pull an image
docker pull python:3.12-slim

# Run a container
docker run -d -p 8000:8000 myapp

# List containers
docker ps

# Build an image
docker build -t myapp:latest .

Docker is essential for any DevOps engineer. It provides consistency, isolation, and efficiency in your deployment pipeline.