DB container name should be same as service name in composer file

[bennythejudge]

In my understanding, the hostname of a container within a compose configuration is the name of the service in the compose file. ` db: image: mariadb ports:

• "3306:3306" volumes:
• dbdata:/var/lib/mysql`

Following the README to install Magento2, I found that the hostname suggest dockermagento2_db_1 did not work for me, but db did.

From the Docker doc:

For example, suppose your app is in a directory called myapp, and your docker-compose.yml looks like this:

` version: "3" services: web: build: . ports:

• "8000:8000" db: image: postgres ports:
• "8001:5432" `

When you run docker-compose up, the following happens: A network called myapp_default is created. A container is created using web’s configuration. It joins the network myapp_default under the name web. A container is created using db’s configuration. It joins the network myapp_default under the name db.

I am going to submit a PR to this effect.

[fballiano]

thanks @bennythejudge, I merged your PR, sorry for the delay!