Deployed Docker-Compose returns "502 Bad Gateway"

Please assist.

I found a blog post, https://blog.ssdnodes.com/blog/host-multiple-ssl-websites-docker-nginx/) regarding deploying multiple docker-compose application with the same nginx-proxy but with different VIRTUAL_HOST names

But for some reason, both applications are returning an Error 502 Bad Gateway

The following error is what I see when I run docker-compose logs nginx

2019/05/29 20:52:26 [error] 8#8: *15 connect() failed (111: Connection refused) while connecting to upstream, client: 52.209.30.187, server: gregsithole.com, request: "GET / HTTP/1.1", upstream: "http://172.20.0.5:80/", host: "gregsithole.com"

And I believe the upstream is using an internal docker network IP because that’s not the IP for my Server. My upstream is determined by the following file: https://raw.githubusercontent.com/jwilder/nginx-proxy/master/nginx.tmpl

But I’m not too familiar with how it works.

The following is an example of my docker-compose files:

nginx-proxy/docker-compose.yaml

version: "3.6"
services:
  nginx:
    image: nginx
    container_name: nginx-proxy
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - conf:/etc/nginx/conf.d
      - vhost:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
      - certs:/etc/nginx/certs
    labels:
      - "com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy=true"

  dockergen:
    image: jwilder/docker-gen
    container_name: nginx-proxy-gen
    restart: always
    depends_on:
      - nginx
    command: -notify-sighup nginx-proxy -watch -wait 5s:30s /etc/docker-gen/templates/nginx.tmpl /etc/nginx/conf.d/default.conf
    volumes:
      - conf:/etc/nginx/conf.d
      - vhost:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
      - certs:/etc/nginx/certs
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - ./nginx.tmpl:/etc/docker-gen/templates/nginx.tmpl:ro

  letsencrypt:
    image: jrcs/letsencrypt-nginx-proxy-companion
    container_name: nginx-proxy-le
    restart: always
    depends_on:
      - nginx
      - dockergen
    environment:
      NGINX_PROXY_CONTAINER: nginx-proxy
      NGINX_DOCKER_GEN_CONTAINER: nginx-proxy-gen
    volumes:
      - conf:/etc/nginx/conf.d
      - vhost:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
      - certs:/etc/nginx/certs
      - /var/run/docker.sock:/var/run/docker.sock:ro

volumes:
  conf:
  vhost:
  html:
  certs:

networks:
  default:
    external:
      name: nginx-proxy

dockerized-ghost/docker-compose.yaml

version: "3.6"
services:

  ghost:
    image: ghost
    restart: always
    expose:
      - 80
    volumes:
      - ../../ghost:/var/lib/ghost/content
    environment:
      NODE_ENV: production
      url: https://blog.gregsithole.com
      VIRTUAL_HOST: blog.gregsithole.com
      LETSENCRYPT_HOST: blog.gregsithole.com
      LETSENCRYPT_EMAIL: hidden-email

networks:
  default:
    external:
      name: nginx-proxy

Please assist

Source: StackOverflow