Reverse Proxy with Web-servers

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Reverse Proxy with Web-servers

                 A reverse proxy server is a type of proxy serve that typically sits behind the firewall in a private network and directs client requests to the appropriate backed serve. A reverse proxy provides an additional level of abstraction and control to ensure the smooth flow of network traffic between client and servers. 
                    
                      We have quite few ways to reverse proxy a particular site or ip address. One among them is by using web servers(Apache httpd & Nginx).

Let's deep dive into the configurations.

Using Nginx Server


        Nginx is an open soure, high performance HTTP server, load balance and reveres proxy software. It has a straightfoward configuration language making it easy to configure.
  • Install Nginx on your machine
                       CentOS:  yum install -y epel-release
                                      yum install -y nginx

                     Ubuntu:  apt-get install -y epel-release
                                    apt-get install -y nginx

                      Debian:  apt install -y epel-release
                                     apt install -y nginx
  • Start & check the status of service
                          service nginx start
                          service nginx status
  • Check the port number on which Nginx is running
              By default, web servers like Nginx & Apache httpd runs on the default 80 port. If you've already started Apache httpd on your machine, you have to stop it first in-order to start the Nginx server.

              The alternative would be by changing the port numbers. It's recommend and a best practice if you're running on default port 80 if you're running only specific web-server at a time.

                               netstat -tnlp
                               netstat -tnlp ' grep 80

    You can run the  server running on your machine by providing the url: localhost:80 or just localhost.
  • Change the configuration in Nginx
         Go to /etc/nginx/nginx.conf search for /location {} and append with below configuration.

              proxy_pass http://127.0.0.1:8080;
      proxy_redirect off;

      proxy_set_header Host $host;        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;
Save the changes and exit. 

  • Restart the server
              Allow traffic on you port 80 on your firewall. Finally, visit the following address from your web browser. 
                        localhost:80 or just localhost

           Now, you'd be able to see the Jenkins page opening instead of Nginx home page. If you're still seeing Ngnix page, please make the below changes and restart the service again.
           
                   /usr/sbin/setsebool httpd_can_network_connect true 

             By running the local host, you'd be able to see the Jenkins Server.

 Using Apache HTTP Server 



     Apache web server is an open source web server creation, deployment and managed software. Initially developed by a group of software programmers, it is now maintained by the Apache Software Foundation.
  • Install Apache http on your machine
                              CentOS:  yum install -y httpd
                              Ubuntu :  apt-get install -y httpd
                              Debian:   apt install -y httpd
  • Start & check the status of service
                          service http start
                          service http status
  • Check the port number on which Http is running
               By default, web servers like Nginx & Apache httpd runs on the default 80 port. If you've already started Nginx on your machine, you have to stop it first in-order to start the Http server.

              The alternative would be by changing the port numbers. It's recommend and a best practice if you're running on default port 80 if you're running only specific web-server at a time.

                         netstat -tnlp

    You can see the server running on your machine by providing the url: localhost:80 or just localhost.
  • Change the configuration in Http

                 Go to /etc/http/conf.d You can find few configurations files here. We have to create a new file(default-sites.conf) and append the proxy configuration.

          cd /etc/http/conf.d
         touch default-sites.conf

    Append the below configuration in this file.

           <VirtualHost *:80>
            ProxyPreserveHost On
             ProxyPass / http://127.0.0.1:8080/
             ProxyPassReverse / http://127.0.0.1:8080/
     </VirtualHost>
    Save the file and exit.
  • Restart the server
               Restart the server and visit the following address from your web browser.  
                            localhost:80 or just localhost

       Now, you'd be able to see the Jenkins page opening instead of Apache Http home page.




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