Getting Started with Docker

Docker lets you package applications with everything they need to run. No more "it works on my machine" problems. This guide will get you running containers in no time.

What is Docker?

Docker is a platform for developing, shipping, and running applications in containers. Containers are lightweight and include everything needed to run the software.

Installing Docker

sudo apt update
sudo apt install docker.io
sudo systemctl start docker
sudo systemctl enable docker

Running Your First Container

sudo docker run hello-world

Common Docker Commands

Run a Container

sudo docker run -d nginx

-d = detached (runs in background)

List Containers

sudo docker ps
sudo docker ps -a  # all containers

Stop a Container

sudo docker stop container_id

Remove a Container

sudo docker rm container_id

List Images

sudo docker images

Working with Ports

sudo docker run -d -p 8080:80 nginx

Maps port 8080 on host to port 80 in container

Working with Volumes

sudo docker run -d -v /my/data:/data nginx

Mounts /my/data from host to /data in container

Docker Compose

sudo apt install docker-compose

Docker Compose lets you define multi-container applications in a single file.

You're now ready to start containerizing your applications!