Symfony docker container can't connect to Mysql - php

Question

My stack is quite common, one container for my Symfony app, another one for Mysql.
For some reason, Symfony can't connect to Mysql container with following error :
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'
A simple php file to test the MySQL connection, on the Symfony container works with this
<?php
$dbh = new PDO('mysql:host=database;dbname=mysite', 'mysite', 'password');
Here is my Symfony parameters file:
database_driver: pdo_mysql
database_host: database
database_port: 3306
database_name: mysite
database_user: mysite
database_password: password
And here is my docker-compose file :
site:
build: webapp
ports :
- "80:80"
volumes:
- /home/myuser/dev/mysite:/var/www/html/
links:
- database
database:
image: mysql:5.5
ports:
- "3306:3306"
environment:
- MYSQL_ROOT_PASSWORD=password
- MYSQL_DATABASE=mysite
- MYSQL_USER=mysite
- MYSQL_PASSWORD=password
I also tried with a fresh Symfony project without error.

Answer 1

Remove the database driver and port to use. As you didn't use port forwarding, you don't have to specify the port for MySQL. Also, there's a mistake into your driver, it's not just pdo but pdo_mysql (documentation).
database_host: database
database_name: mysite
database_user: mysite
database_password: password
Also, why do you specify a database_path ? MySQL doesn't need because you call it by TCP/IP. Old SQLite database ?
You could also checkout your config.yml file :
# Doctrine Configuration
doctrine:
dbal:
driver: pdo_mysql
host: "%database_host%"
port: "%database_port%"
dbname: "%database_name%"
user: "%database_user%"
password: "%database_password%"
charset: UTF8
# if using pdo_sqlite as your database driver:
# 1. add the path in parameters.yml
# e.g. database_path: "%kernel.root_dir%/data/data.db3"
# 2. Uncomment database_path in parameters.yml.dist
# 3. Uncomment next line:
# path: "%database_path%"
orm:
auto_generate_proxy_classes: "%kernel.debug%"
naming_strategy: doctrine.orm.naming_strategy.underscore
auto_mapping: true