I have a Django app that runs locally with no problems. Now, I want to get a docker image of my app but when I try to build it, it gives me the following error:
django.db.utils.OperationalError: could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Cannot assign requested address
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
I am new on Django and Docker development and i was looking for similar questions but none answer solved my problem.
I'll show you my Dockerfile, I have copied the Postgres commands from another project that does work:
FROM python:3.8
RUN apt-get update
RUN mkdir /project
WORKDIR /project
RUN apt-get install -y vim
COPY requirements.txt /project/
RUN pip install -r requirements.txt
COPY . /project/
# Install postgresql
RUN apt install -y postgresql postgresql-contrib
RUN service postgresql start
# Run the rest of the commands as the ``postgres`` user created by the ``postgres-9.3`` package when it was ``apt-get installed``
USER postgres
# Create a PostgreSQL role
RUN /etc/init.d/postgresql start &&\
psql --command "CREATE USER admin WITH SUPERUSER PASSWORD 'passwd';" &&\
createdb -O admin plataforma
USER root
# setup postgresql
RUN sed -i "/^#listen_addresses/i listen_addresses='*'" /etc/postgresql/13/main/postgresql.conf
RUN sed -i "/^# DO NOT DISABLE\!/i # Allow access from any IP address" /etc/postgresql/13/main/pg_hba.conf
RUN sed -i "/^# DO NOT DISABLE\!/i host all all 0.0.0.0/0 md5\n\n\n" /etc/postgresql/13/main/pg_hba.conf
# running commands of my app
RUN python manage.py makemigrations accounts
RUN python manage.py sqlmigrate accounts 0001
RUN python manage.py migrate
RUN python manage.py inicializar
# Expose some ports
EXPOSE 22 5432 8080 8009 8000
# volumes
VOLUME ["/var/lib/postgresql/12/main"]
# Default command
CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]
Here is my requirements.txt file:
#requirements.txt
Django==3.2.8
djangorestframework==3.9.1
gunicorn==19.9.0
pandas==1.3.3
path==16.2.0
six==1.14.0
Pillow==7.0.0
psycopg2>=2.8
django-environ==0.8.1
Here is my settings.py file (the databases fragment):
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': env('POSTGRESQL_NAME'),
'USER': env('POSTGRESQL_USER'),
'PASSWORD': env('POSTGRESQL_PASS'),
'HOST': env('POSTGRESQL_HOST'),
'PORT': env('POSTGRESQL_PORT'),
}
}
And here is my .env file:
POSTGRESQL_NAME=plataforma
POSTGRESQL_USER=admin
POSTGRESQL_PASS=passwd
POSTGRESQL_HOST=localhost
POSTGRESQL_PORT=5432
DEBUG=True
Some people told me that I could make a docker-compose file so I erased the postgres install commands from Dockerfile and made this:
version: "3.3"
services:
db:
image: postgres
volumes:
- ./data/db:/var/lib/postgresql/data
ports:
- "5432:5432"
web:
build: .
command: python manage.py runserver 0.0.0.0:8000
volumes:
- .:/code
ports:
- "8000:8000"
environment:
- POSTGRES_NAME=plataforma
- POSTGRES_USER=admin
- POSTGRES_PASSWORD=passwd
depends_on:
- db
But this doesn't work either.
Footnote: If I use the Django's default database (SQLite) and (obviously) erase postgress commands from Dockerfile, I can build the Docker image without problems, and, again, this app with postgres works good if I run it locally. So, something is happening with Docker + postgres and I don't know what to do.
Somebody can help me? Thank you!
Edit: I erased the migrations commands from Dockerfile and replaced environ var of POSTGRESQL_HOST to db and when I run $ sudo docker-compose run web python manage.py runserver . the image is created but the container not, and when I try to run a container with that image i get the following error:
django.db.utils.OperationalError: could not translate host name "db" to address: Name or service not known
Sorry my english, I still learning it too.
EDIT AGAIN: I finally solved this issue in this question
Thanks for the help!
