How to start a Dockerized Django server with custom ip address? - django

Question

When we want to run a bare Django app we use the term: python manage.py runserver <ip>:<port> to start a web server with the desired IP address. I tried to do a similar thing with Docker and Django inside the docker-compose file:
version: '3.1'
volumes:
init-db:
data-db:
services:
mongo:
image: mongo
restart: always
environment:
MONGO_INITDB_ROOT_USERNAME: <name>
MONGO_INITDB_ROOT_PASSWORD: <password>
ports:
- 27020:27020
command: mongod --quiet --logpath /dev/null
splash:
image: scrapinghub/splash
ports:
- "8050:8050"
restart: always
web:
build: .
restart: unless-stopped
command: >
bash -c "pip install -r requirements.txt && python manage.py makemigrations && python manage.py migrate && python manage.py runserver <some_ip>:<some_port>"
tty: true
volumes:
- .:/usr/src/app
ports:
- 8000:8000
depends_on:
- mongo
Now after running it is giving me web_1 | Error: That IP address can't be assigned to.
Note: I get the IP address using windows' ipconfig then I select the ipv4

Answer 1

The process inside the Docker container must listen on the special "all interfaces" address 0.0.0.0. The container itself has its own private IP space, and can't bind to arbitrary host interfaces.
Conversely, the ports: declaration in your docker-compose.yml can name a specific IP address to listen on, and this must be one of the host's interfaces.
So your docker-compose.yml file should look roughly like:
version: '3.8'
services:
web:
build: .
restart: unless-stopped
ports: ['192.168.1.2:8000:8000'] # <-- host IP address here
depends_on: [mongo]
# shouldn't need tty:, volumes:, or command:
mongo: # as in the question, except
ports: ['27020:27017'] # <-- second port needs to be standard MongoDB port
And the corresponding Dockerfile should look something like:
FROM python:3.9
WORKDIR /app
COPY requirements.txt .
RUN pip install -r requirements.txt
COPY . .
ENTRYPOINT ["/app/entrypoint.sh"]
# #!/bin/sh
# python manage.py migrate
# exec "$#"
EXPOSE 8000
# Use 0.0.0 as the listen address vvvvvvv
CMD ["./manage.py", "runserver", "0.0.0.0:8000"]

Answer 2

I ended up using the same code I added, restarting my pc was the solution that I did not expect.