Introduction

What is it ?

Videos

• 100s https://youtu.be/Gjnup-PuquQ

• 5m https://youtu.be/_dfLOzuIg2o

• 10m https://youtu.be/DQdB7wFEygo

Websites

https://average.joe.dev/awesome-docker/

https://awesome-docker-compose.com/

https://compose.ajnart.dev/

https://nuxx.io/

Installation

Most Linux Distros

https://docs.docker.com/engine/install/

curl -fsSL https://get.docker.com | sudo sh
sudo usermod -aG docker $USER
newgrp docker

Arch Based Distros

paru -S --noconfirm docker docker-compose docker-buildx
sudo groupadd docker ; sudo usermod -aG docker $USER

Log out and log back in so that your group membership is re-evaluated.

Basics

docker run -it --rm docker/doodle

Mounting

-v src:dest:ro OR --mount type=tmpfs,src=folder1,dst=folder2

Dockerfile

Dockerfile is used to build docker images (not containers), here is an example of Dockerfile

FROM debian:latest
LABEL maintainer="kp <[e-mail]>"

RUN apt-get update \
    && apt-get install -y iputils-ping \
    && apt-get install -y traceroute \
    && apt-get install -y curl \
    && apt-get clean

CMD ["/usr/bin/bash"]

Build & Push Image

You need a free dockerhub account.

docker login --username [e-mail]
docker build -t you_username/your_image:latest .
docker push your_username/your_image:latest

Docker Compose

Install

sudo apt update
sudo apt install docker-compose-plugin

Usage

The docker compose command makes the creation of containers easy. You first need to create a compose.yaml file, here is an example :

Be Careful: Each Docker Volume/Network used need to be created in the compose file outside of services (level 0 of yaml), see the end of the example. By default all of the containers will be created in the same docker network.

services:
  # MARIADB
  db:
    image: mariadb:latest
    environment:
      MYSQL_RANDOM_ROOT_PASSWORD: 1
      MYSQL_DATABASE: blog
      MYSQL_USER: bloguser
      MYSQL_PASSWORD: pass123
    volumes:
      - dbvol:/var/lib/mysql
    networks:
      - blognet
    restart: always

  # PHPMYADMIN
  dbadmin:
    image: phpmyadmin/phpmyadmin:latest
    environment:
      PMA_HOST: db
    ports:
      - 9090:80
    networks:
      - blognet
    restart: always

  # WORDPRESS
  web:
    image: wordpress:latest
    environment:
      WORDPRESS_DB_HOST: db
      WORDPRESS_DB_USER: bloguser
      WORDPRESS_DB_PASSWORD: pass123
      WORDPRESS_DB_NAME: blog
    ports:
      - 9000:80
    networks:
      - blognet
    volumes:
      - webvol:/var/www/html/wp-content
    restart: always

volumes:
  dbvol:
  webvol:

networks:
  blognet:

and run:

docker compose up -d

Examples

Basic commands

• Run Docker Compose file: docker compose up -d

• Start all services: docker compose up

• Stop all services: docker compose down