apache - 与上游连接时拒绝连接-Docker

Question

我得到的错误:

nginx_prod_vet | 2019/03/07 20:57:11 [error] 6#6: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.23.0.1, server: , request: "GET /backend HTTP/1.1", upstream: "http://172.23.0.2:81/backend", host: "localhost:90"

我的目标是使用nginx作为反向代理来传递前端文件并将其他服务代理到前端，因此可以从localhost:90 /调用localhost:90 / backend。

我试图从容器外部访问后端，但是它给了我上面的错误。

以下是最相关的文件:

# docker-compose.yml

version: '3'

services:

  nginx:
    container_name: nginx_prod_vet
    build:
      context: .
      dockerfile: nginx/prod/Dockerfile
    ports:
      - "90:80"
    volumes:
      - ./nginx/prod/prod.conf:/etc/nginx/nginx.conf:ro
    networks:
      - main
    depends_on:
      - backend

  backend:
    container_name: backend_prod_vet
    build:
        context: .
        dockerfile: apache/Dockerfile
    ports:
      - "81:81"
    networks:
      - main

networks:
  main:
    driver: bridge

# apache/Dockerfile
FROM httpd:2.4.32-alpine

RUN apk update; \
    apk upgrade;

# Copy apache vhost file to proxy php requests to php-fpm container
COPY apache/apache.conf /usr/local/apache2/conf/apache.conf
RUN echo "Include /usr/local/apache2/conf/apache.conf" \
>> /usr/local/apache2/conf/httpd.conf

# apache/apache.conf
ServerName localhost

LoadModule deflate_module /usr/local/apache2/modules/mod_deflate.so
LoadModule proxy_module /usr/local/apache2/modules/mod_proxy.so
LoadModule proxy_fcgi_module /usr/local/apache2/modules/mod_proxy_fcgi.so

<VirtualHost *:81>
    # Proxy .php requests to port 9000 of the php-fpm container
    # ProxyPassMatch ^/(.*\.php(/.*)?)$ fcgi://php:9000/var/www/html/$1
    DocumentRoot /var/www/html/
    <Directory /var/www/html/>
        # DirectoryIndex index.php
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
    </Directory>

    # Send apache logs to stdout and stderr
    CustomLog /proc/self/fd/1 common
    ErrorLog /proc/self/fd/2
</VirtualHost>

# nginx/prod/prod.conf
user  nginx;
worker_processes  1;

events {
  worker_connections  1024;
}

http {
  include /etc/nginx/mime.types;
  client_max_body_size 100m;

  upstream backend {
    server backend:81;
  }


  server {
    listen 80;
    charset utf-8;

    root /dist/;
    index index.html;

    location /backend {
      proxy_redirect off;
      proxy_pass http://backend;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
    }


  }
}

# nginx/prod/Dockerfile
# build stage
FROM node:10.14.2-jessie as build-stage
WORKDIR /app/
COPY frontend/package.json /app/
RUN npm cache verify
RUN npm install
COPY frontend /app/
RUN npm run build

# production stage
FROM nginx:1.13.12-alpine as production-stage
COPY nginx/prod/prod.conf /etc/nginx/nginx.conf
COPY --from=build-stage /app/dist /dist/
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]

编辑:

docker-compose exec后端netstat -lnpt

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.11:38317        0.0.0.0:*               LISTEN      -
tcp        0      0 :::80                   :::*                    LISTEN      1/httpd

docker-compose exec nginx sh -c“nc后端81 && echo打开|| echo关闭”

closed.

Answer 1

docker-compose exec backend netstat -lnpt向我们显示服务backend的httpd Web服务器正在侦听80端口而不是81。

因此，很可能您的Dockerfile apache/Dockerfile在尝试提供自定义httpd配置apache/apache.conf方面是错误的。

要进一步调查:

确保主要的apache conf内容符合您的期望:docker-compose exec backend cat /usr/local/apache2/conf/httpd.conf

检查您的后端服务日志:docker-compose logs backend

这样做，您将意识到您在主apache配置文件中缺少 Listen 81指令。您可以在 apache/Dockerfile文件中解决此问题:

# apache/Dockerfile
FROM httpd:2.4.32-alpine

RUN apk update; \
    apk upgrade;

# Copy apache vhost file to proxy php requests to php-fpm container
COPY apache/apache.conf /usr/local/apache2/conf/apache.conf

RUN echo "Listen 81" >> /usr/local/apache2/conf/httpd.conf
RUN echo "Include /usr/local/apache2/conf/apache.conf" >> /usr/local/apache2/conf/httpd.conf

为什么后端容器在端口81上监听？

它不会增加任何值来使您的不同容器打开不同的端口。每个容器都有其自己的IP地址，因此无需避免在docker-compose项目中定义的服务之间的端口冲突。