docker ERROR: for nginx Cannot start service nginx: driver failed programming external connectivity on - django

Question

I'm new to Docker and setting up my first Django application using Docker
My application path looks like
app
|- helloworld
|- __init__.py
|- manage.py
|- static_cdn
|- static_root
|- config
|- nginx
|- nginx.conf
|- Dockerfile
|- docker-compose.yml
|- requirements.txt
|- start.sh
the contents of Docerfile
FROM ubuntu:18.04
# -- Install Pipenv:
FROM python:3
ENV PYTHONUNBUFFERED 1
ENV LC_ALL C.UTF-8
ENV LANG C.UTF-8
# -- Install Application into container:
RUN set -ex && mkdir /app
WORKDIR /app
ADD requirements.txt /app/
RUN pip install -r requirements.txt
# -- Adding dependencies:
ADD . /app/
contents of docker-compose.yml
version: '3'
services:
nginx:
image: nginx:latest
ports:
- "9010:9010"
volumes:
- .:/app
- ./config/nginx:/etc/nginx/conf.d
- ./static_cdn:/static
depends_on:
- web
web:
build: .
command: ./start.sh
volumes:
- .:/app
- ./static_cdn:/static
ports:
- "9010:9010"
depends_on:
- db
expose:
- "9010"
db:
image: postgres
contents of config/nginx/nginx.conf
upstream web {
ip_hash;
server web:9010;
}
server {
location /static {
autoindex on;
alias /static/
}
location / {
proxy_pass http://127.0.0.1;
}
listen 9011;
server_name localhost;
}
contents of start.sh
#!/usr/bin/env bash
# Start Gunicorn processes
echo --: Starting application build
echo --: Creating migration
exec python3 manage.py makemigrations
echo ------: makemigrations complete
echo --: Running migration
exec python3 manage.py migrate
echo ------: migrate complete
echo --: Running collectstatic
exec python3 manage.py collectstatic
echo ------: collectstatic complete
echo Starting Gunicorn.
exec gunicorn helloworld.wsgi:application \
--bind 0.0.0.0:9010 \
--workers 3
Now, when I build using docker
docker-compose up --build
It gives error as
ERROR: for nginx Cannot start service nginx: driver failed
programming external connectivity on endpoint koober_nginx_1
(8ea5c084a7283a16afbf136a73dc4b27d9cae35fe14d735b83199ad5d0e03431):
Bind for 0.0.0.0:9010 failed: port is already allocated
I have followed few tutorials to create those Docker files and nginx conf file.
1. How can I solve above issue.
2. Do I need to use FROM ubuntu:18.04 with above configuration?
Edit 2
Now, it stuck after creating migration from start.sh commands

Answer 1

You can't allocate port 9010 of your host for both services.
This is what you're doing in the ports section of declaration of service nginx and web.
Moreover, by default nginx will listen to port 80 and 443 for https.
You can keep it like that and publish to a different port on your host. See how to use port keyword in docker-compose :
https://docs.docker.com/compose/compose-file/#ports
Maybe you want something more like that:
version: '3'
services:
nginx:
image: nginx:latest
ports:
- "10080:80"
- "10443:443"
volumes:
- .:/app
- ./config/nginx:/etc/nginx/conf.d
- ./static_cdn:/static
depends_on:
- web
web:
build: .
command: ./start.sh
container_name: "web-app"
volumes:
- .:/app
- ./static_cdn:/static
expose:
- "9010"
depends_on:
- db
db:
image: postgres
contents of config/nginx/nginx.conf
upstream web {
ip_hash;
server web-app:9010;
}
server {
location /static {
autoindex on;
alias /static/
}
location / {
proxy_pass http://web;
}
listen 80;
server_name localhost;
}
Concerning your last question, you could go for an official Python image from the Docker hub Python repository or start from any other base image like debian:jessie-slim from Debian official repository or keep the Ubuntu 18.04 image

Answer 2

For me, stopping/restarting the NGINX server worked.
To stop Nginx, use the following command:
sudo systemctl stop nginx
To start Nginx when it is stopped, use the following command:
sudo systemctl start nginx
To restart Nginx, use the following command:
sudo systemctl restart nginx
To reload Nginx after making configuration changes, use the following command:
sudo systemctl reload nginx