Nginx反向代理到主机中的应用

问题描述：

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

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

If I comment out - 5000:5000 I get:

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

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

EDIT:

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;
        }
    }
}

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.

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.

EDIT 3: My docker-compose.yml

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

My Dockerfile:

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

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

EDIT:

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

我有一个在Docker外的端口5000上运行的应用程序。我试图通过以下方式在nginx中运行反向代理 Docker组成但无法与主机的端口5000通信。在我的docker-compose.yml文件中，我有： p>

 端口：
-80：80 
-443  ：443 
-5000：5000 
  code>  pre> 
 
 当我尝试运行此程序时，我得到： p> 
 
 
 错误：  for nginx无法启动服务nginx：驱动程序无法对端点nginx上的外部连接进行编程（374026a0d34c8b6b789dcd82d6aee6c4684b3201258cfbd3fb18623c4101）：启动Userland代理时出错：监听tcp 0.0.0.0:5000：绑定：地址已在使用中
  code>  pre> 
  
 如果我注释掉-5000：5000  code>，我得到： p> 
 
 
  [错误] 6＃6：* 1 connect（）失败 （111：连接被拒绝）连接到上游时
  code>  pre> 
 
 如何从Docker nginx容器连接到主机中已经运行的应用程序？ p> \  n 
 
编辑： p> 
 
 
我的nginx.conf文件 p> 
 
 
  用户www-data; 
worker_processes auto; 
pid /run/nginx.pid;

events {
 worker_connections 768; 
} 
 
http {
上游mysite {
服务器0.0.0.0  ：5000; 
} 
 
服务器{
监听80; 
 server_name localhost; 
 
位置/ {
 proxy_pass http：// mysite; 
} 
} 
} 
   pre> 
 
 我尝试卷曲localhost时的响应是 502 Bad Gateway  code>。 该应用程序本身和curl 127.0.0.1:5000从主机响应良好。 p> 
 
 
编辑2：
我也尝试过在此处找到解决方案，但我得到了 nginx：[emerg]主机未在上游“ 搬运工“代码>。  Docker是我的主机的主机名。 p> 
 
 
编辑3：
我的docker-compose.yml  p> 
 
 

 版本：'3'
服务：\  n简单：
构建：./simple
 container_name：简单
端口：
-80：80 
-443：443 
  code>  pre> 
 
 我的Dockerfile  ： p> 
 
 
  FROM nginx 
COPY nginx.conf /etc/nginx/nginx.conf

EXPOSE 80443 
CMD [“ nginx”，“ -g”，“守护程序 关闭；“，”-c“，” / etc / nginx / nginx.conf“] 
  code>  pre> 
 
  EDIT： p> 
 
 
 我正在通过linux中的“主机名”命令来获得计算机主机。 p> 
  div>

答

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

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.
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
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

Nginx反向代理到主机中的应用

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