Docker compose 错误：nginx：在 /etc/nginx/conf.d/default.conf:21 的上游“app”中找不到 [emerg] 主机

Question

尝试通过 docker compose 运行 nginx 和 web 应用程序

码头文件

FROM node:12.16.2 as build

RUN mkdir /app

COPY package*.json ./
RUN npm install

COPY . /app
RUN npm run-script build

COPY --from=build /app/build /var/www/roundmap.app

EXPOSE 3000

nginx 配置默认配置文件

server {
  listen 80;
  listen 443 ssl;
  listen 3000;
  server_name *.roundmap.app 185.146.157.206;

  root /var/www/roundmap.app;
  index index.html;

  ssl_certificate /etc/ssl/roundmap/roundmap.crt;
  ssl_certificate_key /etc/ssl/roundmap/roundmap.key;
  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
  ssl_ciphers HIGH:!aNULL:!MD5;

  if ($scheme = http) {
    return 301 https://$server_name$request_uri;
  }

  location / {
    proxy_pass https://app:3000;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
  }
}

docker-compose.yml

version: "4"
services:
    app:
        build: roundmap/
        container_name: app
        ports:
            - 3000:3000
    nginx:
        image: nginx:1.17.2-alpine
        container_name: nginx
        ports:
            - 80:80
            - 443:443
        links:
            - app
        volumes:
            - ./default.conf:/etc/nginx/conf.d/default.conf
            - /etc/ssl/roundmap/roundmap.crt:/etc/ssl/roundmap/roundmap.crt
            - /etc/ssl/roundmap/roundmap.key:/etc/ssl/roundmap/roundmap.key

通过 docker-compose up 运行 并得到错误

nginx | 2020/07/20 16:39:19 [emerg] 1#1: 在 /etc/nginx/conf.d/default.conf:22 的上游“应用程序”中找不到主机 nginx | nginx：在 /etc/nginx/conf.d/default.conf:22 的上游“app”中找不到 [emerg] 主机 nginx 以代码 1 退出

请帮忙看看我哪里弄错了？

Answer 1

在您的 default.conf 中，将 https://app:3000 替换为 http://app:3000，因为 SSL 终止发生在 Nginx 本身，应用程序仍在使用 http。

更新您的docker-compose.yaml

使用depends_on 代替links，它已被弃用。

version: "3.8"
services:
    app:
        build: roundmap/
        container_name: app
        command: [ "node", "app.js"]
        ports:
            - 3000:3000
    nginx:
        image: nginx:1.17.2-alpine
        container_name: nginx
        ports:
            - 80:80
            - 443:443
        depends_on:
            - app
        volumes:
            - ./default.conf:/etc/nginx/conf.d/default.conf
            - /etc/ssl/roundmap/roundmap.crt:/etc/ssl/roundmap/roundmap.crt
            - /etc/ssl/roundmap/roundmap.key:/etc/ssl/roundmap/roundmap.key