django.db.utils.OperationalError: could not translate host name "db" to address: Temporary failure in name resolution. Django for professionals book

Question

These are my docker files getting this error while changing my engine from SQLite to PostgreSQL. Doing it for the first time following book called Django for professionals docker-compose.yml

services:
  web:
    build: .
    command: python /code/manage.py runserver 0.0.0.0:8000
    volumes:
    - .:/code
    ports:
    - 8000:8000
    depends_on:
    - db
  db:
    image: postgres
    volumes:
      - postgres_data:/var/lib/postgresql/data/

volumes:
  postgres_data:

dockerfile

FROM python:3.9.6

#set environment variables

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

#set work directory
WORKDIR /code

#install dependencies
COPY Pipfile Pipfile.lock /code/
RUN pip install pipenv && pipenv install --system

# Copy project
COPY . /code/

hi, have you tried adding ports to db as you did on web? for example, ports: - 5432:5432 — Kikito
– Kikito, Commented Jul 18, 2022 at 4:02
oh, i meant ports parameter in docker-compose.yml. from what you posted, your db does not have ports. — Kikito
– Kikito, Commented Jul 18, 2022 at 5:50
no I'm not using any port parameters in db. but that worked for me. — Aman Choudhary
– Aman Choudhary, Commented Jul 18, 2022 at 5:54
What command are you running that produces that error? What's the CMD the Docker image should normally run? — David Maze
– David Maze, Commented Jul 18, 2022 at 11:10

Aman Choudhary · Accepted Answer · 2022-07-18 06:00:32Z

1

as suggested by seoul kim above i added ports: -5432:5432 and it worked for me.

answered Jul 18, 2022 at 6:00

Aman Choudhary

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ali kariz · Accepted Answer · 2023-05-24 10:23:35Z

0

hello i think that your problem is in the setting.py and in dtabases change the db to local host or 127.0.0.1

answered May 24, 2023 at 10:23

ali kariz

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