How to access Django manage.py with Docker Compose

Question

I am using Django as my Web-Framework. As a database I use PostgresSQL. To start my Postgres Database and the Webserver I use Docker.

When I start the server and db with docker-compose up, everything works fine. The database loads properly into Django and I dont get any errors.

But when I run for example python3 manange.py makemigrations django throws an error:

could not translate host name "db" to address: Name or service not known

Where "db" is the name of my postgres database. This is even then when server and database are running on a different window. What I find very weird is that the Database is found when I start with docker.

How do I access commands like python3 manage.py [...]?

So for example I need to create a superuser and dont know where to create that because if I use the normal python3 manage.py createsuperuser I get the same error as above.

The console window from starting docker I also cannot use because there the Django Server runs and just displays the incoming http posts and requests.

here It may help.

rezshar
– rezshar

2021-07-09 08:46:55 +00:00
Commented Jul 9, 2021 at 8:46 — rezshar
– rezshar, Commented Jul 9, 2021 at 8:46

AKX · Accepted Answer · 2021-07-11 06:58:40Z

8

You'll need to use docker-compose exec to run the management command within your app container.

docker-compose exec webservicenamehere python manage.py makemigrations

(Refer to docker-compose ps or your compose YAML for webservicenamehere.)

You're getting that db error because the hostname db is only a thing within the Docker network that Docker Compose gives you; your host machine is not aware of such a hostname (and the database isn't directly exposed to the host machine anyway unless you say it should be).

edited Jul 11, 2021 at 6:58

answered Jul 9, 2021 at 8:05

AKX

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4 Comments

Samuel Over a year ago

I am sorry to bother you. But where exactly can I find my Webcontainer Name?

AKX Over a year ago

docker-compose ps

funnydman Over a year ago

@AKX By default, webcontainernamehere != servicename. docker-compose exec expects service name.

Samuel Over a year ago

I found it its just he same given in the docker-compose.yml as a heading

David Maze · Accepted Answer · 2021-07-09 11:39:55Z

1

You can docker-compose run a new container matching a template in your docker-compose.yml file, but with a different command and other settings.

docker-compose run djangoapp \
  ./manage.py createsuperuser

This has two notable advantages over docker-compose exec. You can only use exec on a container that's running, but run creates a new container; if your application can't start until it runs its initial migrations, you need run. Some complex setups do things like set up environment variables in an entrypoint script, and exec will not see these, but run will.

answered Jul 9, 2021 at 11:39

David Maze

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