<h2>INTRODUCTION</h2>
<p>Running multiple web applications under your cable modem is virtually free and awesome.  You can get domains for a couple of bucks, security certificates are free, and you can keep it all nested under a Virtual Box virtual machine to protect your home network.  With today's single page app frameworks like via React or Blazor, the traffic is very low for a small business or a hobby.  You won't even notice it while watching Netflix and your kids are streaming their games in the other room.  </p>
<h2>WORKFLOW</h2>
<p>Here is how to install a web app.  It is similar on a Windows machine, but this is a Linux example. You do step 3 and beyond for each domain you want to build.</p>
<ol>
<li>Buy a domain name: <a href="https://www.cloudns.net/premium/">Premium DNS hosting plans. Test for Free | ClouDNS</a></li>
<li>Install the latest .Net.  This example is for 7.0: </li>
</ol>
<pre class="language-markup"><code>wget https://packages.microsoft.com/config/debian/11/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
rm packages-microsoft-prod.deb

sudo apt-get update &amp;&amp; \
  sudo apt-get install -y dotnet-sdk-7.0</code></pre>
<p style="padding-left: 20pt;">3. Make an example app with dotnet:</p>
<pre class="language-markup"><code>dotnet new blazorserver -o myapp</code></pre>
<p style="padding-left: 20pt;">4.  Add your custom port to the application.json (the ports must be different for all your apps):</p>
<pre class="language-markup"><code>"Kestrel": {
    "Endpoints": {
      "Https": {
        "Url": "http://127.0.0.1:5003"
      },
      "Http": {
        "Url": "http://127.0.0.1:5002"
      }
    }
  }</code></pre>
<p style="padding-left: 20pt;">5. Make the app run as a service by editing a service text file:</p>
<pre class="language-markup"><code>#save this as  /etc/systemd/system/kestrel-myapp.service 
[Unit]
Description=myapp

[Service]
WorkingDirectory=/var/www/myapp
ExecStart=dotnet /var/www/myapp/myapp.dll
Restart=always
# Restart service after 10 seconds if the dotnet service crashes:
RestartSec=10
KillSignal=SIGINT
SyslogIdentifier=myapp
User=root
Environment=ASPNETCORE_ENVIRONMENT=Production

[Install]
WantedBy=multi-user.target</code></pre>
<p style="padding-left: 20pt;"> </p>
<p style="padding-left: 20pt;">6. Publish your app with dotnet.  I write a script to do it for mine and simply execute the script.  Here is my script that I name "m" and chmod +X to quickly publish:</p>
<pre class="language-markup"><code>sudo systemctl stop kestrel-myapp
sudo dotnet publish -o /var/www/myapp
sudo systemctl start kestrel-myapp</code></pre>
<p style="padding-left: 20pt;">7. Edit your Apache site config file:</p>
<pre class="language-markup"><code># this is probably located under /etc/apache2/sites-enabled/000-default.conf
&lt;VirtualHost *:80&gt;
   ServerName mysite.com
   ServerAlias www.mysite.com
   ProxyPreserveHost On
   ProxyPass /  http://127.0.0.1:5002/
   ProxyPassReverse /  http://127.0.0.1:5002/

   ErrorLog ${APACHE_LOG_DIR}/error.log
   CustomLog ${APACHE_LOG_DIR}/access.log combined
&lt;/VirtualHost&gt;</code></pre>
<p style="padding-left: 20pt;">8. Get a free TSL (aka SSL) certificate from Let's Encrypt and Install it with Certbot.  This will help somewhat: <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/SSL-on-amazon-linux-2.html#letsencrypt">Tutorial: Configure SSL/TLS on Amazon Linux 2 - Amazon Elastic Compute Cloud.</a></p>
<p style="padding-left: 20pt;"> </p>
<h2>USEFUL COMMANDS</h2>
<pre class="language-markup"><code>sudo systemctl restart apache2 #used after changing Virtual Host config files

sudo journalctl -u kestrel-myapp.service #used to look at errors of your app service if it isn't working

sudo systemctl status kestrel-myapp.service #used to see if your app service is running

sudo systemctl daemon-reload #used after changing a service config file</code></pre>
<p> </p>
<h2>CONCLUSION</h2>
<p>Seeing it all written out, it all makes perfect sense: 1) install the app framework, 2) run it as a service, 3) configure the web server to route traffic.  However, having it written out will ensure you don't get so frustrated when you do it that you give up.  I hope others find this helpful.</p>
<p>-Sean</p>