serving flask via nginx and gunicorn in docker

Question

Playing around with flask I would like to get a real setup up and running in docker. This means flask should be served via nginx and gunicorn. I set up a sample code repository https://github.com/geoHeil/pythonServing but so far can't get nginx to work properly.

Flask is served on application:5000, docker should resolve application to its respective name.

Nginx config is as follows:

server {

    listen 8080;
    server_name application;
    charset utf-8;

    location / {
        proxy_pass http://application:5000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

which looks good to me. So far I cant find the problem.

edit

compose file is here. Command to start was

docker-compose build
docker-compose up

version: '2'
services:
  application:
    restart: always
    build: ./application
    command: gunicorn -w 4 --bind :5000 wsgi:application
    links:
      - db
    expose:
     - "5000"
    ports:
      - "5000:5000"
  nginx:
    restart: always
    build: ./nginx
    links:
      - application
    expose:
      - 8080
    ports:
      - "8880:8080"

@FarhadFarahi indeed, that works just fine as PING application (192.168.0.3): 56 data bytes 64 bytes from 192.168.0.3: seq=0 ttl=64 time=0.091 ms 64 bytes from 192.168.0.3: seq=1 ttl=64 time=0.129 ms — Georg Heiler
– Georg Heiler, Commented Jan 22, 2017 at 10:39
Gimmie the commands you ran to setup the environment, if you use docker compose please provide compose file. — Farhad Farahi
– Farhad Farahi, Commented Jan 22, 2017 at 11:36
@FarhadFarahi please see the edit as well as github.com/geoHeil/pythonServing — Georg Heiler
– Georg Heiler, Commented Jan 22, 2017 at 11:50

Farhad Farahi · Accepted Answer · 2017-01-22 16:23:22Z

4

Your nginx config file is in a wrong location.

Steps to fix:

sudo docker-compose down

Delete nginx image:

sudo docker images
sudo docker rmi 
REPOSITORY                       TAG                 IMAGE ID            CREATED              SIZE
pythonserving_nginx              latest              152698f13c7a        About a minute ago   54.3 MB

sudo docker rmi pythonserving_nginx

Now change the nginx Dockerfile:

FROM nginx:1.11.8-alpine
MAINTAINER geoheil

ADD sites-enabled.conf /etc/nginx/conf.d/sites-enabled.conf

Please note the location of nginx config.

Now try this docker-compose file (Using User-defined Networks):

version: '2'
services:
  application:
    restart: always
    build: ./application
    command: gunicorn -w 4 --bind :5000 wsgi:application
    networks:
      - testnetwork
    expose:
     - "5000"
    ports:
      - "5000:5000"
  db:
    restart: always
    image: postgres:9.6.1-alpine
    networks:
      - testnetwork
    ports:
      - "5432:5432"
    environment:
      - POSTGRES_USER=d
      - POSTGRES_PASSWORD=d
      - POSTGRES_DB=d
    volumes:
      - ./postgres:/var/lib/postgresql
  nginx:
    restart: always
    build: ./nginx
    networks:
      - testnetwork
    expose:
      - 8080
    ports:
      - "8880:8080"
networks:
  testnetwork:

And Bring up containers:

sudo docker-compose up

Browse to http://localhost:8880

edited Jan 22, 2017 at 16:23

answered Jan 22, 2017 at 13:10

Farhad Farahi

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13 Comments

Georg Heiler Over a year ago

strange. that does not yet work. Nothing in the access or error logs.

Farhad Farahi Over a year ago

Did u do all the steps? Because I tried it. Specially removing old images to make compose build new ones

Georg Heiler Over a year ago

Indeed, I deleted the image. It does not work for me. I am using docker for mac though.

Georg Heiler Over a year ago

I retried on a fresh VM ubuntu. Same problem there.

Farhad Farahi Over a year ago

sudo docker exec -it <nginx container ID> /bin/sh then ls /etc/nginx/ and ls /etc/nginx/conf.d/, gimme the output for both ls commands

|

Aakash Handa · Accepted Answer · 2019-04-09 09:48:01Z

-1

Smaple docker file

FROM python:3.5

RUN apt-get update
RUN apt-get install -y --no-install-recommends \
        libatlas-base-dev gfortran nginx supervisor

RUN pip3 install uwsgi

COPY ./requirements.txt /project/requirements.txt

RUN pip3 install -r /project/requirements.txt

RUN useradd --no-create-home nginx

RUN rm /etc/nginx/sites-enabled/default
RUN rm -r /root/.cache

COPY nginx.conf /etc/nginx/
COPY flask-site-nginx.conf /etc/nginx/conf.d/
COPY uwsgi.ini /etc/uwsgi/
COPY supervisord.conf /etc/

COPY /app /project

WORKDIR /project

CMD ["/usr/bin/supervisord"]

answered Apr 9, 2019 at 9:48

Aakash Handa

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