How to Configure your very first Production Web Sever ?

Answer

1.  In order to have a running production web server, you need a dedicated node (Physical/Virtual or cloud instance) running Linux/Unix, Windows, MacOS etc. 

2.  The Web Server must have a direct network connection and a staticIP address configured on it.

3.  It needs to have all the modules required for running web pages.  If a web server processes PHP pages, it needs to have PHP  module enabled.

4. It also needs to have a good Antivirus application configured and running for securing the Web Server from Malware or Virus attacks.  You also need mechanism to update the configured antivirus/anti malware application on regular basis without any manual intervention in order to get maximum benefit from them.
5. If you have hundreds of domains to be hosted on your web server, you must have to implement limitations on file system quota for each domain, number of databases each domain can create, number of email accounts per domain etc.
6. If your web server has been setup for shared hosting services, users on your web server needs to be restricted. A shared hosting  user should have least user privilege so that he does not damage important files & break the entire server. Apache does not provide any such functionality and needs different third party applications, customization of OS to achieve this. 
7. If you are adding a new domain on your web server, it needs editing hundreds of configuration file to enable all features for the added domain.
8. If one of the hosted domains requires different PHP setting than rest of the domains, implementing this in core Apache web server is very complex and needs customization of your web server in great extent.
9. A production web server needs a firewall to block unwanted traffic that could cause high load on your server.  Implementing IPTABLE rules with command line is very complex.  It needs expertise of core Linux/Unix environment to write effective firewall rules for blocking unwanted traffic.  IPTABLE is based on netfilter module; it is an OS level firewall that allows an administrator to create rules for incoming/outgoing traffic on the server.
10. A production web server requires several different applications like Email, FTP for file upload, Domain Name System for parked domains.  Managing all these applications on a core Linux/Unix system requires expertise on the respective technologies.

So, one can say that managing a web server for multiple domains is very complex task and requires editing hundreds of configuration file, customizing each application to fulfill the desired result.  Troubleshooting any miss configuration will be very difficult for beginners.