ICIM
June 26, 2021
191 views
1 vote
2 Answers

Explanation of what I am trying to do:

I have 2 servers on the ip 192.168.1.10 (docker reverse proxy) and 192.168.1.20 (other services). I want 10 to redirect requests to 20 (many of these requests are with SSL).

Example:

user request		answer back		return
example_internal.host.com	→	192.168.1.10	→	https://example_internal.host.com
example_external.host.com	→	192.168.1.20	→	https://example_external.host.com

docker-compose.yaml:

version: '3'

services:
  nginx-proxy:
    image: budry/jwilder-nginx-proxy-arm:0.6.0
    restart: always
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - certs:/etc/nginx/certs:ro
      - confd:/etc/nginx/conf.d
      - vhostd:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
    labels:
      - com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy
    environment:
      - DEFAULT_HOST=example_external.host.com
    networks:
      - frontend

  letsencrypt:
    image: jrcs/letsencrypt-nginx-proxy-companion:stable
    restart: always
    volumes:
      - certs:/etc/nginx/certs:rw
      - confd:/etc/nginx/conf.d
      - vhostd:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
      - /var/run/docker.sock:/var/run/docker.sock:ro
    environment:
      - [email protected]
    networks:
      - frontend
    depends_on:
      - nginx-proxy

  nginx_internal:
    image: nginx:stable-alpine
    hostname: example_internal.host.com
    restart: always
    expose:
      - "80"
    volumes:
      - /var/www/html:/usr/share/nginx/html:rw
    environment:
      - VIRTUAL_HOST=example_internal.host.com
      - LETSENCRYPT_HOST=example_internal.host.com
      - NGINX_HOST=example_internal.host.com
      - [email protected]
    depends_on:
      - nginx-proxy
      - letsencrypt
    networks:
      - frontend


  nginx_external:
    hostname: example.host.com
    restart: always
    build:
      context: ./scm-proxy
    expose:
      - "80"
    environment:
      - VIRTUAL_HOST=example_external.host.com
      - LETSENCRYPT_HOST=example_external.host.com
      - [email protected]
      - ENABLE_NGINX_REMOTEIP=1
    depends_on:
      - nginx-proxy
      - letsencrypt
    networks:
      - frontend

networks:
   frontend:
     driver: bridge

scm-proxy/Dockerfile:

FROM nginx:1.15-alpine
COPY nginx.conf /etc/nginx/nginx.conf

scm-proxy/nginx.conf:

worker_processes 1;

events {
  worker_connections 1024;
}

http {

    sendfile on;
    client_max_body_size 0;
    chunked_transfer_encoding on;

    server {
        listen 80;
        location / {
            proxy_pass        http://localhost:80;
            proxy_redirect    off;
            proxy_set_header  Host              $http_host;   # required for docker client's sake
            proxy_set_header  X-Real-IP         $remote_addr; # pass on real client's IP
            proxy_set_header  X-Forwarded-For   $proxy_add_x_forwarded_for;
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-Proto $scheme;
        }
    }
}

(In several places I have read that I must put in "/etc/hosts" the resolution of the dns, which would be something like "192.168.1.20 example_external.host.com")

The truth is that this is my first time using this technology and I have not been able to find much information and what I have found has been quite difficult to understand.

Answers

Chosen as BEST ANSWER

This is the configuration that has worked for me:

Comments:

Some details are missing such as the nginx.conf file automatically taking the example_external.host.com in the server_name field, but it will be later.

On the other hand, you have to be careful with DEFAULT_HOST= if it is declared, you may get errors. I recommend commenting on it until it works and then uncommenting it

I recommend using this command: docker-compose up -d --remove-orphans --build

Files:

docker-compose.yaml:

version: '3'

services:
  nginx-proxy:
    image: budry/jwilder-nginx-proxy-arm:0.6.0
    restart: always
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - certs:/etc/nginx/certs:ro
      - confd:/etc/nginx/conf.d
      - vhostd:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
    labels:
      - com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy
#    environment:
#      - DEFAULT_HOST=example_internal.host.com
    networks:
      - frontend

  letsencrypt:
    image: jrcs/letsencrypt-nginx-proxy-companion:stable
    restart: always
    volumes:
      - certs:/etc/nginx/certs:rw
      - confd:/etc/nginx/conf.d
      - vhostd:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
      - /var/run/docker.sock:/var/run/docker.sock:ro
    environment:
      - [email protected]
    networks:
      - frontend

  nginx_external1:
    container_name: tests
    restart: always
    build:
      context: ./scm-proxy
    expose:
      - "80"
    environment:
      - VIRTUAL_HOST=example_external.host.com
      - LETSENCRYPT_HOST=example_external.host.com
      - [email protected]
    extra_hosts:
      - "example_external.host.com:192.168.1.20"
    depends_on:
      - nginx-proxy
      - letsencrypt
    networks:
      - frontend

networks:
   frontend:
     driver: bridge

scm-proxy/Dockerfile:

FROM nginx:stable-alpine
COPY nginx.conf /etc/nginx/nginx.conf

scm-proxy/nginx.conf:

events {
  worker_connections 1024;
}

http {
  server {
    listen 80;
    listen [::]:80;
    server_name example_external.host.com;
#
    location / {
#        proxy_pass         http://example.com;
#        proxy_pass         http://192.168.1.20;
        proxy_pass         http://example_external.host.com;
    }
  }
}

A special thanks to @richardsefton for his dedication

(Edit)

the nginx config there is reverse proxying to itself on port 80. If you want to reverse proxy to one of the other containers change lacalhost to whatever service name you gave the container. eg http://nginx_external:80

If that does not work, try ammending your config to being something along the lines of:

upstream app {
    server app:8080;
}

server {
    listen 80;
    listen [::]:80;
    server_name <your_host_here>;
    return 301 https://<your_host_here>$request_uri;
}

server {
    listen 443 ssl http2;
    listen [::]:443 http2;
    server_name <your_host_here>;

    ssl_certificate /etc/nginx/ssl/certificate.crt;
    ssl_certificate_key /etc/nginx/ssl/key.key;

    location / {
        proxy_pass http://app;
        proxy_set_header        X-Real-IP           $remote_addr;
        proxy_set_header        X-Forwarded-For     
        $proxy_add_x_forwarded_for;
        proxy_set_header        X-Forwarded-Proto   $scheme;
        proxy_set_header        Host                $host;
        proxy_set_header        X-Forwarded-Host    $host;
        proxy_set_header        X-Forwarded-Port    $server_port;
        proxy_http_version      1.1;
        proxy_set_header        Upgrade             $http_upgrade;
        proxy_set_header        Connection          'upgrade';
        proxy_cache_bypass      $http_upgrade;
        proxy_buffer_size       128k;
        proxy_buffers           4                   256k;
        proxy_busy_buffers_size 256k;
    }
}

The above is tried and tested in my own dev container stack

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Reverse proxy to another machine – Nginx