Symfony Docker容器无法连接到Mysql

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