nginx反向代理到其他nginx 502坏网关

Question

我想创建两个服务，它们都有自己的nginx。我想使用第三条nginx作为这两条的反向代理，但我得到了

502坏网关

当我请求

http://127.0.0.1:8080/
http://127.0.0.1:8080/one
http://127.0.0.1:8080/two

获得：

http://127.0.0.1:8081
http://127.0.0.1:8082

工作正常

我有这个码头-复合的。

version: "3.3"
services:
  nginx-one:
    image: nginx:1.17.8
    ports:
      - "8081:80"
    networks: 
      - frontend
      - backend
    volumes: 
      - ./nginx-one/html:/usr/share/nginx/html
  nginx-two:
    image: nginx:1.17.8
    ports:
      - "8082:80"
    networks: 
      - frontend
      - backend
    volumes: 
      - ./nginx-two/html:/usr/share/nginx/html
  nginx-reverse-proxy:
    image: nginx:1.17.8
    ports:
      - "8080:80"
    networks: 
      - frontend
      - backend
    volumes: 
      - ./nginx-reverse-proxy/html:/usr/share/nginx/html
      - ./nginx-reverse-proxy/conf.d:/etc/nginx/conf.d
  debian-network:
    image: cslev/debian_networking
    stdin_open: true # docker run -i
    tty: true        # docker run -t
    networks: 
      - frontend
      - backend
networks:
  frontend:
    internal: false
  backend:
    internal: true

和dir结构

.
├── docker-compose.yml
├── nginx-one
│   └── html
│       └── index.html
├── nginx-reverse-proxy
│   ├── conf.d
│   │   └── default.conf
│   └── html
│       └── index.html
├── nginx-two
    └── html
        └── index.html

nginx.conf含量

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
}

和

Con.d/default.conf

server {

    listen 80;

    location /one {
        proxy_pass http://127.0.0.1:8081/;
    }

    location /two {
        proxy_pass http://127.0.0.1:8082/;
    }
}

当我评论这行docker-come.yml时

# ./nginx-reverse-proxy/conf.d:/etc/nginx/conf.d

因此不使用conf.d/default.conf，我从主机的浏览器请求：

http://127.0.0.1:8080/

它给出了来自nginx-反向代理本身的适当响应，但很明显。

http://127.0.0.1:8080/one
http://127.0.0.1:8080/two

不要提供任何回应

http://127.0.0.1:8081
http://127.0.0.1:8082

而不是404。

码头ps输出：

IMAGE                     COMMAND                  CREATED          STATUS         PORTS                  NAMES
cslev/debian_networking   "bash"                   25 minutes ago   Up 3 minutes                          nginxproblem_debian-network_1
nginx:1.17.8              "nginx -g 'daemon of…"   47 minutes ago   Up 3 minutes   0.0.0.0:8080->80/tcp   nginxproblem_nginx-reverse-proxy_1
nginx:1.17.8              "nginx -g 'daemon of…"   14 hours ago     Up 3 minutes   0.0.0.0:8082->80/tcp   nginxproblem_nginx-two_1
nginx:1.17.8              "nginx -g 'daemon of…"   14 hours ago     Up 3 minutes   0.0.0.0:8081->80/tcp   nginxproblem_nginx-one_1

运行此脚本：

#!/bin/sh

docker exec nginxproblem_debian-network_1 curl -sS 127.0.0.1:8080
docker exec nginxproblem_debian-network_1 curl -sS nginxproblem_nginx-reverse-proxy_1:8080

docker exec nginxproblem_debian-network_1 curl -sS 127.0.0.1:8080/one
docker exec nginxproblem_debian-network_1 curl -sS nginxproblem_nginx-reverse-proxy_1:8080/one
docker exec nginxproblem_debian-network_1 curl -sS 127.0.0.1:8080/two
docker exec nginxproblem_debian-network_1 curl -sS nginxproblem_nginx-reverse-proxy_1:8080/two

docker exec nginxproblem_debian-network_1 curl -sS 127.0.0.1:8081
docker exec nginxproblem_debian-network_1 curl -sS nginxproblem_nginx-one_1:8080

docker exec nginxproblem_debian-network_1 curl -sS 127.0.0.1:8082
docker exec nginxproblem_debian-network_1 curl -sS nginxproblem_nginx-two_1:8082

给予：

curl: (7) Failed to connect to 127.0.0.1 port 8080: Connection refused
curl: (7) Failed to connect to nginxproblem_nginx-reverse-proxy_1 port 8080: Connection refused
curl: (7) Failed to connect to 127.0.0.1 port 8080: Connection refused
curl: (7) Failed to connect to nginxproblem_nginx-reverse-proxy_1 port 8080: Connection refused
curl: (7) Failed to connect to 127.0.0.1 port 8080: Connection refused
curl: (7) Failed to connect to nginxproblem_nginx-reverse-proxy_1 port 8080: Connection refused
curl: (7) Failed to connect to 127.0.0.1 port 8081: Connection refused
curl: (7) Failed to connect to nginxproblem_nginx-one_1 port 8080: Connection refused
curl: (7) Failed to connect to 127.0.0.1 port 8082: Connection refused
curl: (7) Failed to connect to nginxproblem_nginx-two_1 port 8082: Connection refused

当- ./nginx-reverse-proxy/conf.d:/etc/nginx/conf.d未被注释时，

与从浏览器访问ip地址相反地注释- ./nginx-reverse-proxy/conf.d:/etc/nginx/conf.d时的相同输出。

Answer 1

除非启用了主机联网，否则127.0.0.1将指向容器本身。您可以通过服务名称(例如nginx-one或nginx-two )从同一网络中的容器中引用其他两个容器。

您还将容器端口80映射到主机上的端口8080/8081/8082。然而，这对同一网络中的容器之间的通信没有任何作用。检查医生们

默认情况下，当使用docker或docker运行创建或运行容器时，它不会将其任何端口发布到外部世界。若要使端口可用于Docker以外的服务或未连接到容器网络的Docker容器，请使用-publish或-p标志。这将创建一个防火墙规则，将容器端口映射到Docker主机上的端口到外部世界。

因此，尝试将http://127.0.0.1:8081/;更改为http://nginx-one/;，它应该可以工作。