Compose: connection refused to linked container

[oleksiipysanko]

Hi, I have an odd problem with one of linked containers in my compose setup.

Software:
MacOS 10.12.3 (firewall disabled)
docker 17.03.0-ce, build 60ccb22
docker-compose 1.11.2, build dfed245

I have 4 containers for postgresql, nginx, api and web (as customer) (under node). Nginx serves as a proxy server for both node apps. Everything is working fine except that nginx container can't connect to web no matter what I try, while api works as expected.

Dockerfiles:

api

FROM node:latest

RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main' > /etc/apt/sources.list.d/pgdg.list
RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
RUN apt-get update && apt-get install -y postgresql-client-9.6

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY . /usr/src/app

RUN yarn install --no-lockfile

CMD ["bash", "./deploy/start.sh"]

customer

FROM node:latest

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY . /usr/src/app

RUN yarn install --no-lockfile
RUN ./node_modules/.bin/webpack

CMD ["node", "server.js"]

nginx

FROM nginx

COPY nginx.conf /etc/nginx/nginx.conf

nginx.conf

worker_processes 2;

events { worker_connections 1024; }

http {
  server {
    listen 3000;

    location / {
      proxy_pass http://api:3000;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection 'upgrade';
      proxy_set_header Host $host;
      proxy_cache_bypass $http_upgrade;
    }
  }

  server {
    listen 3001;

    location / {
      proxy_pass http://customer:3001;
    }
  }
}

docker-compose.yml

version: '3'
services:
  api:
    build: 
      context: ../api
      dockerfile: ./deploy/Dockerfile
    depends_on:
      - db
    links:
      - db
  db:
    image: postgres
    environment:
      POSTGRES_PASSWORD: ''
      POSTGRES_USER: oleksiipysanko
  customer:
    build: 
      context: ../web-customer
      dockerfile: ./deploy/Dockerfile
    environment:
      NODE_ENV: production
      port: 3001
  nginx:
    build: ./nginx
    links:
      - api
      - customer
    ports:
      - '3000:3000'
      - '3001:3001'

I've exec'ed into customer container and run curl http://localhost:3001 - it returns html as expected. Though when running curl http://customer:3001 from nginx container I get Connection refused. Though requests to api container are working as they should at the same time. Also, I'm seeing 502 Nginx page when browsing localhost:3001, so it exposes 3001 for nginx container, but fails to connect to customer for some reason

Am I missing something here? Been struggling with this problem for more then 3hrs already and can't see solution. Please, let me know

[oleksiipysanko]

Sorry for bothering, problem had no connection to docker-compose. As it turned out, I was using my old start up script from another project for customer where localhost was passed to express app.listen callback as a hostname.

For anyone struggling with same problem: don't use hostname declarations in http server setup. It'll obviously break docker compose linking and docker port expose as well

[kk580kk]

Same problems，and domain is the problems.
But I have try to bind 0.0.0.0, but failed.