Docker Compose MySQL Multiple Database

Onexlab

Jul 3, 2020·3 min read

Docker Compose MySQL Multiple Database

Video Tutorial

In this article, We will explain to you how to set up MySQL following multiple databases using Docker-Compose

1. root (use can use it for local development)
2. test (use can use it for testing)

Production Env:

The production database environment. You can use cloud databases such as AWS RDS, Heroku, etc.

Development Env:

A dedicated environment for database for local development.

Test Env:

A dedicated environment for database testing.

Why we need multiple databases?

If you have only a Production Database and you are developing a new feature if something breaks it will affect the whole Production Database.

For best practice, You must have a different Database Development Environment because if you are developing a new feature in a Development Environment if something breaks it will not impact on Production Database Environment.

Let’s Start Creating Multiple Environment Database

Hope you are familiar with “Docker-Compose”

Folder structure

Project
├── docker-compose.yml (File)
├── init (Directory)
│   ├── 01.sql (File)

Create a new file docker-compose.yml

Above file, we have created a MySQL Docker container with default Port No: 3306

As well as set environment variables such as default username, password of MySQL container.

if you check the entire file we have also created volumes that point to the `./init:/docker-entrypoint-initdb.d` file.

volumes:             
    - ./init:/docker-entrypoint-initdb.d

The script inside “init/01.sql” will create multiple databases upon container startup. You can see the following file we have created 1 new database test

1. mydb (Local development)
2. test (For Testing)

When you run the following command in the root directory for the project.

docker-compose up

then you will see in the console “init/01.sql” script will be executed and create a new database test upon docker startup.

How to test connection

For testing, we used Adminer configured already in the docker-compose file.

Try to run following URL in the browser

http://localhost:8080

You will see the following screen

Then enter username

user

and password

user

then hit the Login button then you will see there are 2 database

1. mydb
2. test

as shown in the following screenshot.

Github

Thank you :)