Configuring Apache mod_proxy load balancer

Installing Apache2 Server
-------------------

sudo apt-get install apache2
sudo /etc/init.d/apache2 restart

Setting up HTTPS
-----------------

sudo a2enmod ssl
sudo a2ensite default-ssl

Setting up load balancing modules
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sudo a2enmod proxy_balancer
sudo a2enmod proxy_http

Now enable mod_proxy in Apache, and proxy requests to the application server by adding the example below to your Apache httpd.conf

# Put this after the other LoadModule directives
LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so

cd /etc/apache2/mods-available
sudo vim proxy.conf 

        # set ProxyRequests off since we're only using the ProxyPass and ProxyPassReverse
        # directives. this keeps the server secure from
        # spammers trying to use your proxy to send email.

        ProxyRequests Off

        
                AddDefaultCharset off
                Order deny,allow
                Allow from all
                #Allow from .example.com
        

        # Enable/disable the handling of HTTP/1.1 "Via:" headers.
        # ("Full" adds the server version; "Block" removes all outgoing Via: headers)
        # Set to one of: Off | On | Full | Block

        ProxyVia On

# Put this in the main section of your configuration (or desired virtual host, if using Apache virtual hosts)
ProxyRequests Off
ProxyPreserveHost On


    Order deny,allow
    Allow from all

sudo apt-get install libapache2-mod-proxy-html 

cd /usr/local/apache2/conf

Add the below line to httpd.conf

Include conf/extra/httpd-proxy-balancer.conf

Restart and reload the server
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sudo service apache2 restart
sudo service apache2 reload