Docker

What is Docker?

Docker is an open-source platform designed to automate the deployment, scaling, and management of applications. It uses container technology to package applications and their dependencies into lightweight, portable containers. These containers ensure that your application runs consistently regardless of where it’s deployed.

Why use docker?

Docker offers several practical benefits:

1. Consistency: Docker containers encapsulate all dependencies, configurations, and the application itself, ensuring that it runs the same way in development, testing, and production environments.
2. Isolation: Each container runs in its isolated environment, which improves security and prevents conflicts between applications.
3. Portability: Docker containers can run on any system that supports Docker, making it easy to move applications between different environments, such as from a developer’s laptop to a cloud server.
4. Efficiency: Containers are lightweight and share the host system’s kernel, which allows for higher density of applications compared to virtual machines.
5. Scalability: Docker integrates well with orchestration tools like Kubernetes and Docker Swarm, enabling easy management and scaling of containerized applications.

Deploying a WordPress Website

Step 1: Create a docker-compose.yml File

version: '3.8'

services:
  db:
    image: mysql:5.7
    container_name: wordpress_db
    volumes:
      - db_data:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: example_root_password
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress_user
      MYSQL_PASSWORD: example_password

  wordpress:
    image: wordpress:latest
    container_name: wordpress_app
    depends_on:
      - db
    ports:
      - "8000:80"
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress_user
      WORDPRESS_DB_PASSWORD: example_password
      WORDPRESS_DB_NAME: wordpress

volumes:
  db_data: {}

Step 2: Run Docker Compose

docker-compose up -d

Access WordPress at http://localhost:8000 and follow the setup wizard to configure your site.