Continue from the hello_world_1, here comes another notes on running multiple containers with docker compose.
With Docker compose, we can configure and start multiple containers with a single yaml file. This is helpful for a technology stack with multiple technologies.
As an example, say that you are working on a project that uses a MySQL database, Python for AI/ML, NodeJS for real-time processing, and .NET for serving API’s. Docker makes this easier with the help of compose.
docker compose is a yaml file in which we can configure different types of services. Then with a single command all containers will be built and fired up.
There are 3 main steps involved in using compose:
- Generate a Dockerfile for each project.
- Setup services in the docker-compose.yml file.
- Fire up the containers.
Here is the full copy of docker-compose.yml.
docker-compose.yml:
version: '3.4'
services:
super-app-db:
image: mysql:8.0.28
environment:
MYSQL_DATABASE: 'super-app'
MYSQL_ROOT_PASSWORD: 'password'
ports:
- '3306:3306'
expose:
- '3306'
super-app-node:
build: ./node
ports:
- "3000:3000"
super-app-dotnet:
build: ./dotnet
ports:
- "8080:80"
super-app-python:
build: ./python
super-app-php:
build: ./php
ports:
- "8000:80"Then, we need to:
- Configure MySQL
- Configure NodeJS
- Configure .NET
- Configure Python
- Configure PHP
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