Docker: proxy_pass to another container - nginx: host not found in upstream

Question

(I know others have asked this question before, but I\'m not able to solve the problem using the solutions proposed in other posts, so i figured i would try to post my c

Answer 1

I figured out how to fix the problem. Got some help to fix the docker-compose.yml, so it looks like this:

docker-compose-yml:

version: "3"
services:
  web:
    image: user/repo:web
    deploy:
      resources:
        limits:
          cpus: "0.1"
          memory: 50M
      restart_policy:
        condition: on-failure
    ports:
      - "8000:80"
    networks:
        main:
            aliases:
                - web


  nginx:
    image: user/repo:nginx
    ports:
      - 80:80
    links:
      - web:web
    depends_on:
      - web
    networks:
        main:
            aliases:
                - nginx
networks:
  main:

After this the nginx container actually ran, but it was still not capable of connecting to the web-container. Found out I was able to use both curl web and curl web -p 8000 to get the page from web, from inside the nginx container. Then I changed the upstream in my nginx.conf from this

upstream docker-web {
    server web:8000;
}

to this:

upstream docker-web {
    server web;
}