docker 2nd 域中的 NginX 返回 502 bad gateway

Question

我有 2 个域指向一个虚拟专用服务器 ubuntu 21。第一个域（在端口 3000 上运行）按预期工作，第二个域（在容器上的端口 4000 和主机上的 5000 上运行）没有并返回 nginx 502错误的网关。我在 nginx 容器上添加了端口 4000 指向 80：

我的配置如下：

docker-compose.yml:

version: '3'
services:
  nginx:
    image: nginx:stable-alpine
    ports:
      - "3000:80" # nginx listen on 80
      - "4000:80"
    volumes:
      - ./nginx/default.conf:/etc/nginx/conf.d/default.conf:ro

  pwm-node:
    build: .
    image: my_acc/pwm-node
    environment:
      - PORT=3000
    depends_on:
      - mongo

  mongo:
    image: mongo
    volumes:
      - mongo-db:/data/db

  redis:
    image: redis
volumes:
  mongo-db:

nginx 配置：

server {
    listen 80;
    server_name first_domain.com www.first_domain.com;

    # Redirect http to https
    location / {
        return 301 https://first_domain.com$request_uri;
    }
}

server {
        listen 80;
        server_name second_domain.com www.second_domain.com;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass http://localhost:4000;
        proxy_redirect off;
    }
}

server {
    listen 443 ssl http2;
    server_name first_domain.com www.first_domain.com;

    ssl on;
    server_tokens off;
    ssl_certificate /etc/nginx/ssl/live/first_domain.com/fullchain.pem;
    ssl_certificate_key /etc/nginx/ssl/live/first_domain.com/privkey.pem;
    ssl_dhparam /etc/nginx/dhparam/dhparam-2048.pem;

    ssl_buffer_size 8k;
    ssl_protocols TLSv1.2 TLSv1.1 TLSv1;
    ssl_prefer_server_ciphers on;
    ssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:DH+3DES:!ADH:!AECDH:!MD5;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass http://pwm-node:3000;
        proxy_redirect off;
    }
}

Answer 1

看起来 nginx 不接受 http://localhost:4000;。我可能必须将 node-app-4000 作为服务添加到 docker-compose.yml 并将 localhost 替换为 node-app-4000