Impossible to connect to my postgreSQL Database - django

Question

I'm using docker and I have started a new project.
I have a backend in Django and I want to use a postgreSQL Database.
I can't connect to my database with Django or with PGAdmin.
This is what I Got when I try to connect to my database (with Django or with PGAdmin)
He is a part of my docker-compose file:
services:
db:
image: postgres
container_name: db_wishlist
restart: always
volumes:
- ./postgres-data-wishlist:/var/lib/postgresql/data
env_file:
- env/base/db.env
- env/dev/db.env
ports:
- "5432:5432"
networks:
wishlist:
aliases:
- db
pgadmin:
image: dpage/pgadmin4
container_name: pgadmin
depends_on:
- db
ports:
- "5051:80"
env_file:
- env/base/db.env
- env/dev/db.env
environment:
PGADMIN_DEFAULT_EMAIL: pgadmin4#pgadmin.org
PGADMIN_DEFAULT_PASSWORD: root
restart: always
networks:
wishlist:
aliases:
- pgadmin
api:
container_name: backend
build:
context: ..
dockerfile: Docker/Dockerfiles/Django
command: python manage.py runserver 0.0.0.0:8000
volumes:
- ../Django/:/api
ports:
- "8000:8000"
env_file:
- env/base/db.env
- env/dev/db.env
depends_on:
- db
links:
- db:db
networks:
wishlist:
aliases:
- api
Here is my db.env:
POSTGRES_DB=wishlist
POSTGRES_USER=maxdal1
POSTGRES_PASSWORD=demo
Here is my settings.py in Django:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql',
'NAME': 'wishlist',
'USER': 'maxdal1',
'PASSWORD': 'demo',
'HOST': 'db',
'PORT': 5432,
}
}
Here is an additional screenshot when I try to connect to my db with PGAdmin:
Error with PGAdmin
I checked every discussion about this error but I can't figure it out.
Can you help me please ?
Thanks.

Answer 1

Have you tried passing your db user to postgres container via environment variable?
environment:
POSTGRES_USER: "youruser"

Answer 2

The following setup works for me:
docker-compose.yaml
services:
postgres:
image: postgres:10-alpine
volumes:
- ./pgdata:/var/lib/postgresql/data/pgdata
environment:
- PGDATA=/var/lib/postgresql/data/pgdata
- POSTGRES_DB=django_db
- POSTGRES_USER=XXX
- POSTGRES_PASSWORD=XXX
ports:
- 127.0.0.1:5432:5432
networks:
- backend
django:
build:
context: .
dockerfile: Dockerfile
environment:
- POSTGRES_HOST=postgres
- POSTGRES_DB=django_db
- POSTGRES_USER=XXX
- POSTGRES_PASSWORD=XXX
volumes:
- ./staticfiles:/staticfiles
- ./media:/media
ports:
- 8000:8000
networks:
- backend
- frontend
settings.py
POSTGRES_HOST = os.environ.get('POSTGRES_HOST', 'localhost')
POSTGRES_DB = os.environ.get('POSTGRES_DB', 'django_db')
POSTGRES_USER = os.environ.get('POSTGRES_USER', 'XXX')
POSTGRES_PW = os.environ.get('POSTGRES_PASSWORD', 'XXX')
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql',
'NAME': POSTGRES_DB,
'HOST': POSTGRES_HOST,
'USER': POSTGRES_USER,
'PASSWORD': POSTGRES_PW,
'CONN_MAX_AGE': 120,
}
}
The Dockerfile for the django app specifies the following env vars:
ENV POSTGRES_DB=$POSTGRES_DB
ENV POSTGRES_HOST=$POSTGRES_HOST
ENV POSTGRES_USER=$POSTGRES_USER
ENV POSTGRES_PASSWORD=$POSTGRES_PASSWORD
You can run this either like this:
$ docker-compose up
or only run the postgres via docker and run Django locally:
$ docker-compose up postgres
in a different terminal:
$ ./manage.py runserver