Lecture 10 – DOCKER COMPOSE

DOCKER COMPOSE

What Is Docker Compose?

Docker Compose is a tool provided by Docker that allows you to define and manage multi-container Docker applications using a simple YAML file. It is used to orchestrate and coordinate multiple Docker containers to work together as a single application stack. With Docker Compose, you can define the services, networks, and volumes required for your application in a declarative manner.

To use Docker Compose, you need to have Docker installed on your system. Docker Compose is usually bundled with Docker for most platforms, but you can also install it separately if needed. It’s an excellent tool for managing complex applications that consist of multiple interconnected containers and services.

How To Install Docker-Compose

Pre-requisites:

Docker up and running

Step 01: To download docker compose.

COPY & RUN –>$ the below command

				
					sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

Step 02: Apply executable permissions to the binary.

COPY & RUN –>$ the below command

				
					sudo chmod +x /usr/local/bin/docker-compose

Step 03: To test the installation.

COPY & RUN –>$ the below command

				
					sudo docker-compose --version

Step 04: Create a directory wordpress and navigate into wordpress dir

COPY & RUN –>$ the below commands

				
					mkdir wordpress

				
					cd wordpress

Step 05: Create a docker-compose text document, copy and paste the below yaml code.

COPY & RUN –>$ the below command

				
					nano docker-compose.yml

				
					version: "3.9"
    
services:
  db:
    image: mysql:5.7
    volumes:
      - db_data:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: somewordpress
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
    
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    volumes:
      - wordpress_data:/var/www/html
    ports:
      - "8000:80"
    restart: always
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
      WORDPRESS_DB_NAME: wordpress
volumes:
  db_data: {}
  wordpress_data: {}