Nginx反向代理到主机中的应用 [英] Nginx reverse proxy to an app in host

问题描述

我有一个应用程序在Docker外部的端口5000上运行.我试图通过Docker compose在Nginx中运行反向代理，但无法与主机的端口5000进行通信.在我的docker-compose.yml文件中， :

I have an app that is running outside Docker on port 5000. I am trying to run a reverse proxy in nginx via Docker compose but am unable to communicate with the host's port 5000. In my docker-compose.yml file I have:

ports:
  - 80:80
  - 443:443
  - 5000:5000

当我尝试运行此命令时，我得到:

When I try to run this I get:

ERROR: for nginx  Cannot start service nginx: driver failed programming external connectivity on endpoint nginx (374026a0d34c8b6b789dcd82d6aee6c4684b3201258cfbd3fb18623c4101): Error starting userland proxy: listen tcp 0.0.0.0:5000: bind: address already in use

如果我将- 5000:5000注释掉，我将得到:

If I comment out - 5000:5000 I get:

[error] 6#6: *1 connect() failed (111: Connection refused) while connecting to upstream

如何从Docker nginx容器连接到主机中已经运行的应用程序?

How do I connect to an already running app in the Host from a Docker nginx container?

我的nginx.conf文件

My nginx.conf file

user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
    worker_connections 768;
}

http {
    upstream mysite {
        server 0.0.0.0:5000;
    }

    server {
        listen 80;
        server_name localhost;

        location / {
        proxy_pass http://mysite;
        }
    }
}

当我尝试卷曲localhost时，响应为502 Bad Gateway.该应用程序本身和curl 127.0.0.1:5000可以从主机正常响应.

The response when I try to curl localhost is 502 Bad Gateway. The app itself and curl 127.0.0.1:5000 responds fine from the host.

我还尝试了此处找到的解决方案但我得到nginx: [emerg] host not found in upstream "docker". Docker是我的主机的主机名.

EDIT 2: I have also tried the solution found here but I get nginx: [emerg] host not found in upstream "docker". Docker is my host's hostname.

我的docker-compose.yml

EDIT 3: My docker-compose.yml

version: '3'
services:
  simple:
    build: ./simple
    container_name: simple
    ports:
      - 80:80
      - 443:443

我的Dockerfile:

My Dockerfile:

FROM nginx
COPY nginx.conf /etc/nginx/nginx.conf

EXPOSE 80 443
CMD ["nginx", "-g", "daemon off;", "-c", "/etc/nginx/nginx.conf"]

我正在通过linux中的主机名"命令来获得计算机主机.

I am getting the computer host via the "hostname" command in linux.

推荐答案

问题出在0.0.0.0:5000.由于Nginx在docker内部运行，因此它尝试在docker机器内部查找此地址，但由于在docker内部没有任何运行在0.0.0.0:5000上的地址而失败.

所以为了解决这个问题

The problem lies with 0.0.0.0:5000. Since Nginx is running inside the docker, it tries to find this address inside docker machine but fails since there is nothing running on 0.0.0.0:5000 inside docker.

So in order to resolve this

1. 您需要为其提供一个可以到达的地址.解决它需要你 首先在主机上以0.0.0.0:5000运行您的应用程序，即您应该能够从浏览器以0.0.0.0:5000打开您的应用程序.
2. 查找您的IP地址.获得IP地址后，您应该能够 通过 ip_address:5000 打开应用程序.由于您的Docker和主机共享同一网络，因此也可以从docker访问此地址
3. 现在，用此 ip_address:5000 替换Nginx conf文件中的 0.0.0.0:5000 .您将能够为您的应用程序提供服务

1. You need to give it an address that it can reach. Solving it requires that you first run your application at 0.0.0.0:5000 on your host machine i.e you should be able to open your application at 0.0.0.0:5000 from your browser.
2. Find your IP address. once you get your IP address you should be able to open you application through ip_address:5000. since your docker and host share the same network this address can be reached from docker also
3. Now, replace the 0.0.0.0:5000 in your Nginx conf file with this ip_address:5000. you would be able to serve your application

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