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

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