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I'm new to Docker, and I'm trying to put my Django rest API in a container with Nginx, Gunicorn and Postgres, using docker-compose and docker-machine. Following this tutorial: https://realpython.com/blog/python/django-development-with-docker-compose-and-machine/

Most of my code is the same as the tutorial's (https://github.com/realpython/dockerizing-django). with some minor name changes.

this my docker-compose.yml (I changed the gunicorn command to runserver for debugging purposes)

web: restart: always build: ./web expose: - "8000" links: - postgres:postgres - redis:redis volumes: - /usr/src/app - /usr/src/app/static env_file: .env environment: DEBUG: 'true' command: /usr/local/bin/python manage.py runserver nginx: restart: always build: ./nginx/ ports: - "80:80" volumes: - /www/static volumes_from: - web links: - web:web postgres: restart: always image: postgres:latest ports: - "5432:5432" volumes: - pgdata:/var/lib/postgresql/data/ redis: restart: always image: redis:latest ports: - "6379:6379" volumes: - redisdata:/data

And this is in my settings.py of Django:

DATABASES = { 'default': { 'ENGINE': 'django.db.backends.postgresql_psycopg2', 'NAME': 'postgres', 'USER': 'postgres', 'PASSWORD': 'postgres', 'HOST': 'postgres', 'PORT': '5432', } }

Nginx and postgres (and redis) are up and running, however my django server wont start, by this error:

web_1 | django.db.utils.OperationalError: could not connect to server: Connection refused web_1 | Is the server running on host "localhost" (::1) and accepting web_1 | TCP/IP connections on port 5432? web_1 | could not connect to server: Connection refused web_1 | Is the server running on host "localhost" (127.0.0.1) and accepting web_1 | TCP/IP connections on port 5432?

I've googled a lot and I've verified that postgres is running, on port 5432, I can connect to it using psql command .

I am lost. What is my mistake?

EDIT: It appears that it is not using my settings.py file or something, since it's asking if the server is running on localhost, while settings should be looking for postgres.

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3 Answers 3

Reset to default
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When those who have this problem please check your settings.py:

DATABASES = { 'default': { 'ENGINE': 'django.db.backends.postgresql_psycopg2', 'NAME': 'dbname', 'USER': 'user', 'PASSWORD': 'password', 'HOST': 'db' } }

Your HOST:'db' and docker-compose file db name should be same. If you want to rename from db, make sure that you change in docker-compose file and setting.py:

db: restart: always image: postgres:latest ports: - "5432:5432" volumes: - pgdata:/var/lib/postgresql/data/
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1 Comment

Thanks man! Finally I got it working after spending almost an entire day into this.
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Checkout your manage.py, there should be a line

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "myproject.settings")

if there is no such line, put it

set your DJANGO_SETTINGS_MODULE with respect to PYTHONPATH.

UPD i cloned your repo and launched the web service by changing command in docker-compose.yml

- command: /usr/local/bin/gunicorn docker_django.wsgi:application -w 2 -b :8000 + command: python manage.py runserver 0.0.0.0:8000

I'm sure DJANGO_SETTINGS_MODULE is correct.

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2 Comments

Thanks for the reply, but the line is there! Everything works locally.
@Your update, it is correct. And the repo I mentioned works out of the box for me :). I've managed to get it working, however I'm not sure how exactly.
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I'm exactly facing the same issue, while runing my django app with docker on aws ec2 instance.

I noticed that this error only happend for the first time the docker image is build, so to fix i juste ran :

CTRL + C then docker-compose up again and everything worked fine.

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