ERROR: The Compose file '.\docker-compose.yml' is invalid because: Unsupported config option for services.drupal: 'postgres'

Question

Here is my docker-compose.yml:

version: "3"

services:
    drupal:
        image: drupal
        ports:
        - "8080:80"
        volumes:
        - drupal-modules:/var/www/html/modules
        - drupal-profiles:/var/www/html/profiles
        - drupal-sites:/var/www/html/sites
        - drupal-themes:/var/www/html/themes
        postgres:
            image: postgres
            environment:
                - POSTGRES_PASSWORD=mypasswd

volumes:
    drupal-modules:
    drupal-profiles:
    drupal-sites:
    drupal-themes:

As I run

$ docker-compose up

I get:

ERROR: The Compose file '.\docker-compose.yml' is invalid because:
Unsupported config option for services.drupal: 'postgres'

what's the problem?

Answer 1

Indentation in your docker-compose.yml is not correct, since .yml files are indent-sensitive.

You have three errors:

1. ports is a key:value data, so - should be indented in the next line.
2. volumes is a key:value data, so - should be indented in the next line.
3. postgres service's indentation should be in the same level as drupal.

So your file should look like this to work:

version: "3"

services:
    drupal:
        image: drupal
        ports:
            - "8080:80"
        volumes:
            - drupal-modules:/var/www/html/modules
            - drupal-profiles:/var/www/html/profiles
            - drupal-sites:/var/www/html/sites
            - drupal-themes:/var/www/html/themes
    postgres:
        image: postgres
        environment:
            - POSTGRES_PASSWORD=mypasswd

volumes:
    drupal-modules:
    drupal-profiles:
    drupal-sites:
    drupal-themes: