Docker / MySQL - Doctrine Migration - Access Database outside container - mysql

Question

Hello :) here is my docker compose :
version: "3.8"
services:
web-server:
build: .
volumes:
- ./:/var/www/html/
ports:
- "8000:80"
links:
- "db:db"
db:
image: mysql:5.6
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: root
phpmyadmin:
image: phpmyadmin/phpmyadmin
ports:
- "8001:80"
links:
- "db:db"
environment:
MYSQL_USERNAME: root
MYSQL_ROOT_PASSWORD: root
As you can see, when i go to phpmyadmin with http://localhost:8001/ i have :
PhpMyAdmin Dashboard
Doctrine Migation is installed in my project, so when i try :
./vendor/bin/doctrine-migrations status
Errors are :
In AbstractMySQLDriver.php line 112:
An exception occurred in driver: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: nodename nor servname provided, or not known
In Exception.php line 18:
SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: nodename nor servname provided, or not known
In PDOConnection.php line 39:
SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: nodename nor servname provided, or not known
In PDOConnection.php line 39:
PDO::__construct(): php_network_getaddresses: getaddrinfo failed: nodename nor servname provided, or not known
Connexion in my env file is :
BDD = pdo-mysql://root:root#db:3306/playlist_maker_multi
I expose port 3306 on my docker-compose so i don't understand why outside my container i can't access to my Database ?
Thanks everybody, if you have explanations.
Have a nice day.
Camille

Answer 1

Could you try running it with this config
I renamed the db service to mysql, explicitly added a network and made your php service depend on mysql, so it will restart untill it establishes a connection, just in case the php container starts running before the mysql container
version: "3.8"
services:
web-server:
build: .
volumes:
- ./:/var/www/html/
ports:
- "8000:80"
links:
- "mysql:db"
mysql:
image: mysql:5.6
container_name: db
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: root
networks:
- net
phpmyadmin:
image: phpmyadmin/phpmyadmin
ports:
- "8001:80"
links:
- "mysql:db"
depends_on:
- mysql
restart: on-failure
environment:
MYSQL_USERNAME: root
MYSQL_ROOT_PASSWORD: root
networks:
- net
networks:
net:
driver: bridge

Answer 2

For applications running on your host machine but outside of your Docker network (i.e. not containerised) that need to connect to a container, you can use localhost instead of db, as the DNS name db is only valid inside the Docker Compose network.
With:
mysql:
image: mysql:5.6
container_name: db
ports:
- "3306:3306"
you are creating a path from locahost:3306 (or MACHINEIP:3306 if on another machine) to the service on mysql:3306 inside the network.

Answer 3

#clarj, do you mean like that ?
version: "3.8"
services:
web-server:
build: .
volumes:
- ./:/var/www/html/
ports:
- "8000:80"
links:
- "localhost:db"
mysql:
image: mysql:5.7
container_name: db
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: root
phpmyadmin:
image: phpmyadmin/phpmyadmin
ports:
- "8001:80"
links:
- "localhost:db"
environment:
MYSQL_USERNAME: root
MYSQL_ROOT_PASSWORD: root