Apache Reverse Proxy with mod_proxy

Follow the steps to install and configure apache as a reverse proxy. 

1. Install apache2 

    sudo apt-get update; sudo apt-get upgrade; sudo apt-get install apache2


2. Enable apache2 modules 

     sudo a2enmod proxy
     sudo a2enmod proxy_http
     sudo a2enmod proxy_balancer
     sudo a2enmod lbmethod_byrequests

3. Update apache2 default configuration file 

     sudo vi /etc/apache2/sites-available/000-default.conf

       <VirtualHost *:80>
              ProxyPreserveHost On
              ProxyPass / http://localhost:8080/
              ProxyPassReverse / http://localhost:8080/

              ErrorLog ${APACHE_LOG_DIR}/error.log
              CustomLog ${APACHE_LOG_DIR}/access.log combined
       </VirtualHost>

Multiple hosts:

<VirtualHost *:80>

    ProxyPreserveHost On

    ProxyPass /web http://localhost:8080/web

    ProxyPassReverse /web http://localhost:8080/web

    ProxyPass /micro http://localhost:8081/micro

    ProxyPassReverse /micro http://localhost:8081/micro

        

#ServerAdmin webmaster@localhost

#DocumentRoot /var/www/html

ErrorLog ${APACHE_LOG_DIR}/error.log

CustomLog ${APACHE_LOG_DIR}/access.log combined

</VirtualHost>

4. Restart the apache2 server 
        sudo systemctl restart apache2