1. AWS server 2. Domain 3. HTTPS 4. CGI and HTTP/2 5. Simple CMS 6. Final customization 7. GY installation 8. Re-installation of OS 9. Docker update

First CGI Program

Our first program uses C++ to calculate \(11+21\) and embed the obtained output into an html code. This will prove that our installation of the software and customizations of the server are working.

Use your terminal to ssh into the server and enter the folder /var/www/html/test01 with the command
```
cd /var/www/html/test01
```
Use the editor nano create the source file of your first C++ program. We will choose the name progTest01 for our source file.
```
nano progTest01.cpp
```

Type the following code in the editor nano. Once you are done, click on Ctrl+x and then choose y to save the file.

#include<iostream>
int main(){
   std::cout<<"\n";
   std::cout<<"<!DOCTYPE html>\n";
   std::cout<<"<body> <h1> Hello CGI / C++ </h1> <p>Hi</p><p>Hi again!</p>";
   int x;
   int y;
   x=11; y=21; int z; z=x+y;
   std::cout<<"<p>The sum of the numbers "<<x<<" and "<<y<<" is "<<z;
   std::cout<<" </p>\n";
   std::cout<<"</body></html>\n";
   return 0;
}

Compile the source code into a binary with the extension cgi. This is a way to do that
```
c++ progTest01.cpp -o myWebsite.cgi
```
Open the browser and type the following in the URL field
```
https://yourdomain.com/test01/myWebsite.cgi
```