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Docker Basics

Docker packages applications into containers — lightweight, portable units that run the same everywhere. It's the foundation of modern DevOps.

bash

# Run a container
docker run hello-world

# Run an interactive Ubuntu container
docker run -it ubuntu bash

# List running containers
docker ps

# List all containers (including stopped)
docker ps -a

# Build from a Dockerfile
docker build -t myapp .

# Run with port mapping
docker run -p 3000:3000 myapp

Tip:Containers share the host's kernel but are isolated from each other. They're much lighter than virtual machines.