Docker Compose for Container Orchestration

Docker Compose is a tool for defining and running multi-container Docker applications. It allows you to define the services, networks, and volumes that make up your application in a single file called a docker-compose.yml file. The services defined in this file can be started with a single command, making it easy to manage the entire application stack.

Here is a basic example of a docker-compose.yml file for an application consisting of an Nginx web server, a PHP application, and a Redis database:

version: '3'
services:
  web:
    image: nginx
    ports:
      - "80:80"
  app:
    image: php:7.3-fpm
  redis:
    image: redis

In this example, there are three services defined: web, app, and redis. Each service is based on a Docker image, with the version specified in the image key. The web service maps port 80 on the host to port 80 in the container, while the other two services do not need to expose any ports to the host.

With this docker-compose.yml file, you can start the entire application stack with docker-compose up.

This will create a new network for the application, start containers for each service, and connect the containers to the network. You can view the logs for each container with the docker-compose logs command, and stop the application with the docker-compose down command.

Docker Compose is a simple and powerful way to define and manage multi-container Docker applications, making it an ideal choice for development and testing.