Nginx：泊坞窗内的502 Bad Gateway

我有运行2个容器的docker stack,第一个是Nginx,第二个是应用程序.

问题是nginx显示错误的网关错误：

这是nginx conf：

upstream example {
  server mystack_app1;  
  # Also tried with just 'app1'
  # server mystack_app2;

  keepalive 32;
}

server {
    listen 80;
    server_name example;

    location / {
                proxy_pass http://example;
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_connect_timeout 150;
                proxy_send_timeout 100;
                proxy_read_timeout 100;
                proxy_buffers 4 32k;
                client_max_body_size 8m;
                client_body_buffer_size 128k;
        }
}

这是docker-compose.yml

version: "3"
services: 

  app1:
    image: my-app:latest    
    ports:
      - "9000:9000"
    networks:
      - webnet  

  web:
    image: my-web:latest    
    ports:
      - "81:80"
    networks:
      - webnet
    deploy:      
      restart_policy:
        condition: on-failure        

networks:
  webnet:

我使用以下命令来部署docker stack：

docker stack deploy -c docker-compose.yml mystack

因此,我可以通过localhost：9000从主机的浏览器访问应用程序-正常.

另外,从Nginx容器中,我可以ping mystack_app1.

但是当访问localhost：81时,nginx显示502 Bad Gateway

请帮忙.