Docker

Docker is a virtualization products used to deliver software in packages called containers. It is used to deliver packages in lightweight containers so that applications can work efficiently in different environments in isolation.

Installation

The first step is to add the Docker repository so that it is updated automatically.

First, add Docker's official GPG key:

  
  sudo apt update
  sudo apt install ca-certificates curl
  sudo install -m 0755 -d /etc/apt/keyrings
  sudo curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
  sudo chmod a+r /etc/apt/keyrings/docker.asc
  

After that, add the repository to apt sources:

  
  echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
  sudo apt update
  

After that, it is possible to install all the necessary packages.

  
  sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
  

To check that the installation went well and everything is running smoothly, run

  
  sudo docker run hello-world
  

Cheatsheet

In the following, I will give some quick commands to use:

• Run a Docker compose image (to be run in the same directory where the Docker image is stored): sudo docker compose up -d
• Stop a running container: docker compose stop NAME-OF-THE-CONTAINER
• Prune any stopped containers to avoid cache conflicts: docker system prune -f
• See running containers: docker ps
• Execute a command in a particular container: docker exec -it NAME-OF-THE-CONTAINER COMMAND