Docker多個容器不能有相同端口號的處理方案

更新時間：2021年03月23日 08:46:55 作者：shane1924

這篇文章主要介紹了Docker多個容器不能有相同端口號的處理方案，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧

問題背景

在docker里用同一份鏡像創(chuàng)建4個容器，網絡選擇bridge模式，A服務在四個容器中都使用了同一個端口號（6000）；為了減少對外暴露的端口數，另外使用了nginx對這4個服務實例做代理，4個服務實例分屬4個upstream，使用了類似/service1、/service2的路徑來訪問4個實例。

此時從本地訪問任一服務，則會報502錯誤，百思不得其解。

connect() failed (111: Connection refused) while connecting to upstream

compose文件

version: '2'
networks:
 nn:
  driver: bridge
services:
 service-1:
  container_name: service-1
  image: foo
  networks:
   - nn
  volumes:
   - ./logs/1:/apps/aaa/bbb-logs
   - ./common:/apps/aaa/bbb
   - ./xxx/1.xml:/ccc/targets.xml
  entrypoint: foo.sh
  command: start app=foo port=6000
  
 service-2:
  container_name: service-2
  image: foo
  networks:
   - nn
  volumes:
   - ./logs/2:/apps/aaa/bbb-logs
   - ./common:/apps/aaa/bbb
   - ./xxx/2.xml:/ccc/targets.xml
  entrypoint: foo.sh
  command: start app=foo port=6000
 
 service-3:
  container_name: service-3
  image: foo
  networks:
   - nn
  volumes:
   - ./logs/3:/apps/aaa/bbb-logs
   - ./common:/apps/aaa/bbb
   - ./xxx/3.xml:/ccc/targets.xml
  entrypoint: foo.sh
  command: start app=foo port=6000
 
 service-4:
  container_name: service-4
  image: foo
  networks:
   - nn
  volumes:
   - ./logs/4:/apps/aaa/bbb-logs
   - ./common:/apps/aaa/bbb
   - ./xxx/4.xml:/ccc/targets.xml
  entrypoint: foo.sh
  command: start app=foo port=6000  
 
 nginx:
  container_name: nginx
  image: nginx:1.15-alpine
  ports:
   - 6001:6001
  networks:
   - nn
  volumes:
   - ./nginx/nginx.conf:/etc/nginx/nginx.conf
   - ./logs/nginx:/var/log/nginx

nginx.conf

worker_processes 8;
worker_rlimit_nofile 65535; 
events {
    use epoll;
    worker_connections 65535;
 }
 
http {
    include mime.types;
    default_type aplication/octet-stream;
    sendfile on;
    log_format main '[$time_local]$remote_addr-$upstream_addr "$request" $status $body_bytes_sent';
 
    upstream service1.local {
      server service-1:6000;
    }
    upstream service2.local {
     server service-2:6000;
    }
    upstream service3.local {
      server service-3:6000;
    }
    upstream service4.local {
      server service-4:6000;
    }
 
    server {
      listen 6001;
      client_max_body_size 100M;
      proxy_set_header Host $host:$server_port;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 
      location /service1/ {
        proxy_pass http://service1.local/;
      }
      location /service2/ {
        proxy_pass http://service2.local/;
      }
      location /service3/ {
        proxy_pass http://service3.local/;
      }
      location /service4/ {
        proxy_pass http://service4.local/;
      }
      location /nginx_status {
        stub_status on;
        access_log off;
      }
    }
}

此時curl localhost:6001/service1/api/v1/....就會報上面的502錯誤，按理說每一個容器都是有各自的網卡，不同容器的端口號應該不沖突才對。