Docker Tutorials

What is Docker?

Docker is a platform for developing, shipping, and running applications inside lightweight containers. Containers bundle your app with all its dependencies, ensuring it runs consistently across environments—from your local machine to production servers.

Installation & Setup

Install Docker Engine on Ubuntu and verify the service.

sudo apt update && sudo apt install -y docker.io

sudo systemctl status docker    # check Docker status

sudo systemctl enable --now docker # enable Docker if not running

docker --version    # check Docker version

Managing Images & Containers

Pull images, run containers, list and manage them.

docker pull nginx

docker run -d -p 8080:80 nginx    # start NGINX in background

docker ps -a       # list all containers

docker stop <container_id>    # stop a container

docker rm <container_id>      # remove a container

Dockerfile Basics

Define custom images with a Dockerfile.

FROM ubuntu:22.04
COPY . /app
RUN apt update && apt install -y python3
CMD ["python3", "/app/app.py"]

docker build -t myapp .    # build image

docker run myapp            # run built image

Docker Compose

Define and run multi-container applications.

version: '3'
services:
  web:
    image: nginx
    ports:
      - "8080:80"
  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: example

docker-compose up -d          # start services

docker-compose logs -f        # follow logs

docker-compose down           # stop & remove containers

Volumes & Networking

Persist data and connect containers across networks.

docker volume create mydata

docker run -d -v mydata:/data nginx

docker network create mynet

docker run -d --network mynet --name web nginx