Docker多个容器不能有相同端口号的处理方案 Docker多个容器不能有相同端口

问题背景在docker里用同一份镜像创建4个容器，网络选择bridge模式，A服务在四个容器中都使用了同一个端口号（6000）；为了减少对外暴露的端口数，另外使用了nginx对这4个服务实例做代理，4个服务实例分属4个upstream，使用了类似/service1、/service2的路径来访问4个实例。
此时从本地访问任一服务，则会报502错误，百思不得其解。

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

compose文件

version: '2'networks: nn:driver: bridgeservices: service-1:container_name: service-1image: foonetworks:- nnvolumes:- ./logs/1:/apps/aaa/bbb-logs- ./common:/apps/aaa/bbb- ./xxx/1.xml:/ccc/targets.xmlentrypoint: foo.shcommand: start app=foo port=6000 service-2:container_name: service-2image: foonetworks:- nnvolumes:- ./logs/2:/apps/aaa/bbb-logs- ./common:/apps/aaa/bbb- ./xxx/2.xml:/ccc/targets.xmlentrypoint: foo.shcommand: start app=foo port=6000 service-3:container_name: service-3image: foonetworks:- nnvolumes:- ./logs/3:/apps/aaa/bbb-logs- ./common:/apps/aaa/bbb- ./xxx/3.xml:/ccc/targets.xmlentrypoint: foo.shcommand: start app=foo port=6000 service-4:container_name: service-4image: foonetworks:- nnvolumes:- ./logs/4:/apps/aaa/bbb-logs- ./common:/apps/aaa/bbb- ./xxx/4.xml:/ccc/targets.xmlentrypoint: foo.shcommand: start app=foo port=6000 nginx:container_name: nginximage: nginx:1.15-alpineports:- 6001:6001networks:- nnvolumes:- ./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; }}}

【Docker多个容器不能有相同端口号的处理方案】此时curl localhost:6001/service1/api/v1/....就会报上面的502错误，按理说每一个容器都是有各自的网卡，不同容器的端口号应该不冲突才对。
解决方案暂时没有较好的方案，只能对4个服务使用不同的端口号，nginx也相应地修改。
补充：同台服务器部署多套docker容器，端口重定向问题
在生成环境，部署多个容器，访问多个端口；
例如：-p 80:80 -p 81:81
81地址退出的时候，直接访问到80端口的地址。
误区：开始以为是cookie的问题，因为刷新了cookie（cookie是不区分端口号）
最终找到了原因：redirect问题，因为退出重定向到登录页面
解决方案：配置nginx参数