Could not translate host name "postgres" to address: nodename nor servname provided, or no-CodePudding

In my symfony project, I create a docker container for postgresql:

php:
    build:
        context: "."
        dockerfile: ./docker/php/Dockerfile
    volumes:
        - .:/var/www/symfony:rw
    depends_on:
        - postgres
postgres:
    image: postgres:13-alpine
    environment:
        POSTGRES_USER: root
        POSTGRES_PASSWORD: root
        POSTGRES_DB: mydb
    ports: [5432]

In my .env file I try to connect to database as follows:

DATABASE_URL="postgresql://root:root@postgres:5432/mydb?serverVersion=15&charset=utf8"

When I try to migrate to DB, I get the following error:

[critical] Error thrown while running command "make:migration". Message: "An exception occurred in the driver: SQLSTATE[08006] [7] could not translate host name "postgres" to address: nodename nor servname provided, or not known"

What am I missing?

CodePudding user response：

I think that you missed to set up an inter-container internal network. It does not come as a default.

Join both php and postgres services to a network (e.g. internal):

services:
    php:
        ...
        networks:
            - internal
        ...

    postgres:
        ...
        networks:
            - internal
        ...
networks:
    internal:

That last bit of network definition is left blank on purpose - we are assuming default bridge mode but you can define whichever you like.