Apache

Configure Apache deployment to proxy connections to other ports

Redirects apache connections to internal (privates IPs) servers

Based on https://www.digitalocean.com/community/tutorials/how-to-use-apache-http-server-as-reverse-proxy-using-mod_proxy-extension

and https://www.digitalocean.com/community/tutorials/how-to-use-apache-as-a-reverse-proxy-with-mod_proxy-on-ubuntu-16-04

Scenario: We have a main server typically with some hostname: main.server.com and we have an application called, e.g., `app` in and internal server with internal IP: 192.168.1.66 and running our `app` as `http://192.168.1.66/app`

In the main server, run the following command to get a list of available Apache modules

a2enmod

# You will be presented with an output similar to:

# Your choices are: access_compat actions ....
# Which module(s) do you want to enable (wildcards ok)?

Once you are prompted with the choice of modules you desire, you can pass the below line listing the module names:

The list of modules:

proxy proxy_ajp proxy_http rewrite deflate headers proxy_balancer proxy_connect proxy_html

The main server works as usual except when the URL with the `app` is requested: http://main.server.com/app.

The following configuration allows to serve the `app` from the internal server!

It is accomplished if we modify the default configuration file 000-default.conf inside /etc/apache2/sites-enabled to set up "proxying" functionality.

Here, we will be defining a proxy virtual host using mod_virtualhost and mod_proxy together.

Copy-and-paste the below block of configuration, amending it to suit your needs:

/etc/apache2/sites-enabled/000-default.conf

<VirtualHost *:*>
    ServerName main.server.com

#   ServerAdmin webmaster@localhost                                                                                                               
    DocumentRoot /var/www/html

    # Servers to proxy the connection, or;                                
    # List of application servers:                                        
    # Usage:                                                              
    # ProxyPass / http://[IP Addr.]:[port]/                               
    # ProxyPassReverse / http://[IP Addr.]:[port]/                        
    # Example:                                                            
    ProxyPass /app http://192.168.1.66/app
    ProxyPassReverse /app http://192.168.1.66/app

 </VirtualHost>

Execute the following command to restart Apache:

systemctl restart apache2

You can make /var/www/html/app a real folder and put there, for example, redirections from other domains.

/etc/apache2/sites-enabled/other.conf

<VirtualHost *:*>
    ServerName other.com

#   ServerAdmin webmaster@localhost                                                                                                               
    DocumentRoot /var/www/html
                             
    ProxyPass /app http://192.168.1.66/app
    ProxyPassReverse /app http://192.168.1.66/app

 </VirtualHost>

and

/var/www/html/app/index.html

<html><head><title>other</title>
<meta http-equiv="refresh" content="0; url=http://other.com/app">
<body></body></html>

Deploying Jupyter hub behind a reverse proxy

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