502 плохой шлюз докер + nginx + js

Question

Я пытаюсь запустить pacman webapp на локальном хосте с балансировкой нагрузки и прокси с nginx.у меня появляется эта ошибка, когда я иду на localhost: 8080 502 bad gateway

другая информация: docker logs dockerpacman_nginx_1

2019/09/19 08:07:40 [error] 8#8: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.27.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "http://172.27.0.3:3000/", host: "localhost:8080"
172.27.0.1 - - [19/Sep/2019:08:07:40 +0000] "GET / HTTP/1.1" 502 157 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0 

sudo docker ps

CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                            NAMES
c160237a9dd8        dockerpacman_nginx    "nginx -g 'daemon of…"   4 minutes ago       Up 4 minutes        80/tcp, 0.0.0.0:8080->8080/tcp   dockerpacman_nginx_1
284e3196c91d        dockerpacman_pacman   "nginx -g 'daemon of…"   4 minutes ago       Up 4 minutes        80/tcp, 3000/tcp                 dockerpacman_pacman_1
d92496f05513        redis                 "docker-entrypoint.s…"   4 minutes ago       Up 4 minutes        0.0.0.0:32787->6379/tcp          dockerpacman_redis_1 ```

docker-compose.yml

version: '3'                                                                                                                                                                                                                                                                   

services:                                                                                                                                                                                                                                                                      
  nginx:                                                                                                                                                                                                                                                                       
    build: ./nginx/                                                                                                                                                                                                                                                            
    links: ['pacman:pacman']                                                                                                                                                                                                                                                   
    ports: ['8080:8080']                                                                                                                                                                                                                                                       
  pacman:                                                                                                                                                                                                                                                                      
    build: .                                                                                                                                                                                                                                                                   
    links: [redis]                                                                                                                                                                                                                                                             
  redis:                                                                                                                                                                                                                                                                       
    image: redis                                                                                                                                                                                                                                                               
    ports: ['6379'] 

Dockerfile для pacman:

#Start with current nginx                                                                                                                                                                                                                                                      
FROM nginx:latest                                                                                                                                                                                                                                                              
#Update package manager and install git                                                                                                                                                                                                                                        
RUN apt-get update && apt-get install -y \                                                                                                                                                                                                                                     
        git\
        curl\
        vim\
        systemd\
        systemd-container\
        net-tools\
        procps\
        sudo\
        iproute2\
        kmod\
        iptables
#Clean the html root dir
RUN rm -R /usr/share/nginx/html/

#Copy pacman app from docker
COPY pacman /usr/share/nginx/html/

#Modify files for web serving
RUN chmod -R 755 /usr/share/nginx/html/*
RUN chown -R www-data /usr/share/nginx/html/*

#octoshield in another script
COPY script/octoshield.sh /home/docker/script/
COPY script/config.yml home/docker/script/
RUN chmod 744 /home/docker/script/octoshield.sh

EXPOSE 3000

nginx.conf

worker_processes 4;

events { worker_connections 1024; }

http {

        upstream mysite {
              least_conn;
              server pacman:3000;
        }

        server {
              listen 8080;
              server_name localhost;
              location / {
                proxy_pass http://mysite;
                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;
              }
        }
}

, пожалуйста, помогите мне.Я полагаю, что проблема в том, что я не запускаю приложение js в Docker, но когда я работаю только с Dockerfile

#sudo docker build . -t pacman
#sudo docker run --privileged=true --name=pacman -d -p 8080:80 pacman

, который работает

, но не с Docker-compose sudo docker-compose up -d --build