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Docker configuration to run a Symfony app.

Run

docker-compose up -d --build
docker-compose run php composer install

You can now visit http://localhost:8080 and you will see the default Symfony page.

Useful commands

Symfony commands:

docker-compose exec php bin/console

Included stuff

Nginx

The official Nginx image is used with a slight addition for permissions.

The virtual host is defined in the app.conf file. This file is shared with the container as defined in the docker-compose.yml file. I prefer to share the host like this instead of using COPY in the Dockerfile as there is no need to build a new image if the host changes. A simple docker-compose up -d will take the new host into account.

PHP-FPM

PHP-FPM 7.4 is installed with the following configuration:

  • Necessary extensions for Symfony
  • MySQL
  • GD
  • Composer
  • PHPUnit
  • Xdebug

Xdebug

Making Xdebug working with Docker is quite tricky as there is currently a limitation to Docker for Mac that prevents a container to make a request to the the host, which is exactly what we would like to do with Xdebug.

To make Xdebug debugging work, you will first need to run this command on the host:

sudo ifconfig lo0 alias 10.200.10.1/24

This IP address is configured in the environment variables of the PHP container, in the docker-compose.yml file:

services:
  php:
    # ...
    environment:
      XDEBUG_REMOTE_HOST: 10.200.10.1

No extra configuration is needed in your IDE (tested on Sublime Text, Visual Studio Code and Atom), apart the usual.

Interesting resources: