docker-compose uwsgi connect() failed (111: Connection refused)

Question

I made infra with docker.

Also used docker-compose to tide each container.

Below is images that I used.

• nginx:latest
• mongo:latest
• python:3.6.5

To deploy flask webserver, I used uwsgi.

(uwsgi installed at python:3.6.5)

[docker-compose.yml]

version: '3.7'

services:
  nginx:
    build: 
      context: .
      dockerfile: docker/nginx/dockerfile
    container_name: nginx
    hostname: nginx-dev
    ports:
      - '80:80'
    networks: 
      - backend
    links:
      - web_project

  mongodb:
    build:
      context: .
      dockerfile: docker/mongodb/dockerfile
    container_name: mongodb
    hostname: mongodb-dev
    ports:
      - '27017:27017'
    networks:
      - backend

  web_project:
    build:
      context: .
      dockerfile: docker/web/dockerfile
    container_name: web_project
    hostname: web_project_dev
    ports:
      - '5000:5000'
    networks:
      - backend
    tty: true
    depends_on:
      - mongodb
    links:
      - mongodb


networks: 
  backend:
    driver: 'bridge'

[/docker/nginx/dockerfile]

FROM nginx:latest

COPY . ./home
WORKDIR home
RUN rm /etc/nginx/conf.d/default.conf
COPY ./config/nginx.conf /etc/nginx/conf.d/default.conf

[/config/nginx.conf]

upstream flask {
    server web_project:5000;
}
server {
    listen 80;

    location / {
        uwsgi_pass flask;
        include /home/config/uwsgi_params;
    }
}

[/docker/web/dockerfile]

FROM python:3.6.5

COPY . ./home
WORKDIR home
RUN pip install -r app/requirements.txt
RUN apt-get update && apt-get install -y uwsgi-plugin-python
RUN uwsgi --ini config/uwsgi.ini

[uwsgi.ini]

[uwsgi]
chdir = /home/app
socket = :5000
chmod-socket = 666
logto = /home/web.log
master = true
process = 2
daemonize = /home/uwsgi.log

Defined socket = :5000.

After build/up and access to website, it throws 502 bad gateway throw error to console.

nginx | 2018/11/12 06:28:55 [error] 6#6: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.27.0.1, server: , request: "GET / HTTP/1.1", upstream: "uwsgi://172.27.0.3:5000", host: "localhost"

I searched in google long times, but I can't find the solution.

Is there any solution here?

Thanks.

Answer 1

You must expose the port 5000 in the Python app

FROM python:3.6.5

COPY . ./home
WORKDIR home
RUN pip install -r app/requirements.txt
RUN apt-get update && apt-get install -y uwsgi-plugin-python
EXPOSE 5000 # <---- add this
RUN uwsgi --ini config/uwsgi.ini