Link between symfony and docker - php

Question

I'm on a symfony project and i'm using docker here's my docker-compose.yml :
version: '3.7'
services:
db:
image: mysql:latest
container_name: ruakh_db
restart: always
volumes:
- db-data:/var/lib/mysql
environment:
MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
networks:
- dev
phpmyadmin:
image: phpmyadmin:latest
container_name: ruakh_phpmyadmin
restart: always
depends_on:
- db
ports:
- 8080:80
environment:
PMA_HOST: db
networks:
- dev
maildev:
image: maildev/maildev
container_name: ruakh_mail_dev
restart: always
command: bin/maildev --web 80 --smtp 25 --hide-exetensions STARTTLS
ports:
- 8081:80
networks:
- dev
apache:
build: php
container_name: ruakh_www
ports:
- 8088:80
volumes:
- ./php/vhosts:/etc/apache2/sites-enabled
- ./:/var/www
restart: always
networks:
- dev
networks:
dev:
volumes:
db-data:`
here's the database url used in my symfony project :
DATABASE_URL=mysql://root:root#ruakh_db/ruakh
I'm trying to run a php bin/console make:migration however when i'm running I get this error :
An exception occurred in driver: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution
I'm assuming that the database url is incorrect, when I changed it to :
DATABASE_URL=mysql://root:root#127.0.0.1:8080/ruakh
This error is thrown:
An exception occurred in driver: SQLSTATE[HY000] [2006] MySQL server has gone away
How can I manage to connect my symfony project to my docker database ?

Answer 1

There is a couple things wrong with your DATABASE_URL.
DATABASE_URL=mysql://root:root#ruakh_db/ruakh
You don't set the password in your service config
You have the wrong host name
You don't specify the database
You are using native authentication, which must be enabled when using MySQL 8
(optional) your database port is not exposed
Password
In your docker-compose.yml. you do not specify the root password and instead allow for an empty password. You can set the root password using an environment variable:
services:
db:
...
environment:
MYSQL_ROOT_PASSWORD: example
Database name
In order to create a default database named ruakh you need to provide another environment variable MYSQL_DATABASE.
Host
The next issue is the host name in your DATABASE_URL: ruakh_db. This is the name of the container, but not the name of the service (i.e. the host in the virtual network that docker-compose sets up). This should be db instead.
Port
You will not be able to access your mysql database from outside the docker container, because you do not expose any ports. That is not necessarily an issue, but you should be aware of it. Looking at your other database url DATABASE_URL=mysql://root:root#127.0.0.1:8080/ruakh this will not work, because the port 8080 is for the web interface provided by phpmyadmin. It is not the port of the actual database. Also, the port for the database is not exposed. You probably want to add:
services:
db:
...
ports:
- 3306:3306
Authentication
Another issue, you will face is using the image mysql:latest this will use MySQL 8.0 which does not allow the authentication mechanism you want to use by default. You will have to change the command executed when running the container or downgrade to MySQL 5.7. If you want to keep MySQL 8, you should add this:
services:
db:
...
command:
- 'mysqld'
- '--character-set-server=utf8mb4'
- '--collation-server=utf8mb4_unicode_ci'
- '--default-authentication-plugin=mysql_native_password'
Summary
This is roughly what your db service should look like to work with your DATABASE_URL:
db:
image: mysql:latest
ports:
- '3306:3306'
environment:
MYSQL_DATABASE: ruakh
MYSQL_ROOT_PASSWORD: 'root'
command:
- 'mysqld'
- '--character-set-server=utf8mb4'
- '--collation-server=utf8mb4_unicode_ci'
- '--default-authentication-plugin=mysql_native_password'