Unable to communicate with postgres using docker and django - django

Question

I don't achieve to communicate with my database postgres using Docker and Django. Here is my docker-compose.yml :
version: '3'
services:
web:
container_name: web
build:
context: ./web
dockerfile: Dockerfile
command: python manage.py runserver 0.0.0.0:8000
volumes:
- ./web/:/usr/src/web/
ports:
- 8000:8000
- 3000:3000
- 35729:35729
env_file:
- database.env
stdin_open: true
depends_on:
- database
database:
container_name: database
image: postgres
volumes:
- database-data:/var/lib/postgresql/data/
ports:
- 5432:5432
volumes:
database-data:
Here is my database.env :
# database.env
POSTGRES_USERNAME=admin
POSTGRES_PASSWORD=pass
POSTGRES_DBNAME=db
POSTGRES_HOST=database
POSTGRES_PORT=5432
PGUSER=admin
PGPASSWORD=pass
PGDATABASE=db
PGHOST=database
PGPORT=5432
DATABASE=db
SQL_HOST=database
SQL_PORT=5432
And here is my Dockerfile :
# pull official base image
FROM python:3.8.3-alpine
# set work directory
WORKDIR /usr/src/web
# set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
# install psycopg2 dependencies
RUN apk update \
&& apk add postgresql-dev gcc python3-dev musl-dev
RUN apk add zlib-dev jpeg-dev gcc musl-dev
# install nodejs
RUN apk add --update nodejs nodejs-npm
# copy project
ADD . .
# install dependencies
RUN pip install --upgrade pip
RUN pip install -r requirements.txt
# run entrypoint.sh
ENTRYPOINT ["sh", "/usr/src/web/entrypoint.sh"]
And there my entrypoint.sh :
#!/bin/sh
if [ "$DATABASE" = "db" ]
then
echo "Waiting for postgres..."
while ! nc -z $SQL_HOST $SQL_PORT; do
sleep 10
done
echo "PostgreSQL started"
fi
exec "$#"
I build the docker using that : docker-compose up -d --build
Then I type that : docker-composexec web npm start --prefix ./front/ .
I can access to the frontent : http://localhost:3000
But when I do docker logs database I got that :
2021-01-18 06:31:49.207 UTC [1] LOG: database system is ready to accept connections
2021-01-18 06:31:51.640 UTC [32] FATAL: password authentication failed for user "admin"
2021-01-18 06:31:51.640 UTC [32] DETAIL: Role "admin" does not exist.
Connection matched pg_hba.conf line 99: "host all all all md5"
Here is the status :
37ee3e314d52 web "sh /usr/src/web/ent…" About a minute ago Up About a minute 0.0.0.0:3000->3000/tcp, 0.0.0.0:8000->8000/tcp, 5432/tcp web
65dfeae57a94 postgres "docker-entrypoint.s…" About a minute ago Up About a minute 0.0.0.0:5432->5432/tcp database
Coud you help me ?
Thank you very much !

Answer 1

It seems like the postgres user you are using doesn't exist. You can add some environment variables to database docker-compose to create those (you probably need to create the database, too), Or you can write some script to create those for the first time.
version: '3'
services:
web:
container_name: web
build:
context: ./web
dockerfile: Dockerfile
command: python manage.py runserver 0.0.0.0:8000
volumes:
- ./web/:/usr/src/web/
ports:
- 8000:8000
- 3000:3000
- 35729:35729
env_file:
- database.env
stdin_open: true
depends_on:
- database
database:
container_name: database
image: postgres
volumes:
- database-data:/var/lib/postgresql/data/
ports:
- 5432:5432
environment:
- POSTGRES_USER=admin
- POSTGRES_PASSWORD=pass
- POSTGRES_DB=db
volumes:
database-data:
About postgres image envs you can check this link .