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--- hints:misc [2023/07/08 21:05] – [Building BGPDUMP] philip
+++ hints:misc [2023/08/19 07:20] (current) – [Building a Looking Glass] philip
@@ Line 41: / Line 41: @@
 You can now take your MRT files, eg as produce by [[http://routeviews.org|RouteViews]] and convert them into plain text for further analysis.
+===== Building a Looking Glass =====
+These instructions cover how to put together the [[https://github.com/Cougar/lg|Cougar Looking Glass]] code. Why choose this one? Well, it's there, it seems to work fine, and installs nicely on Ubuntu 22.04. Even though the code itself hasn't been touched since 2009!
+First off, grab the few files you need off the repo - you could clone it, but there are only a few files, and they haven't been changed in a while. Put them all in **/usr/local/src/LG**. All the directions below assume that the working directory is here.
+Assuming a basic install of Ubuntu 22.04, we need to add a few packages, including a compiler.
+<code>
+sudo apt install apache2 make gcc libexpat1-dev
+</code>
+Next we need to install a few extra perl modules to support the looking glass. Assuming we don't have CPAN already set up, we need to do:
+<code>
+cpan App::cpanminus
+</code>
+This installs the basic CPAN environment to make adding in modules simpler. Once the CPAN environment is in place, you then need to run:
+<code>
+cpan install CPAN::DistnameInfo
+cpan install XML::Parser
+cpan install Net::Telnet
+</code>
+which will install the XML parser and telnet support for Perl. This should all complete successfully - you'll see these two packages and all the supporting modules being automatically installed.
+With the Apache2 webserver installed in its default configuration, we now need to create two folders for the Looking Glass components.
+<code>
+sudo mkdir -p /var/www/looking-glass/lg
+</code>
+And then copy the required components into place.
+<code>
+sudo cp -p favicon.ico index.html lg.cgi lg.conf /var/www/looking-glass/lg/
+</code>
+Next we need to create the Apache site configuration:
+<code>
+cd /etc/apache2/sites-available
+</code>
+and create a new config file with the URL of your site, for example, **lg.my.site.conf** with the following contents:
+<code>
+<VirtualHost *:80>
+  ServerName  lg.my.site
+  DocumentRoot /var/www/looking-glass/lg/
+  Alias /lg/favicon.ico /var/www/looking-glass/lg/favicon.ico
+  Alias /libraries /var/www/looking-glass/libraries
+  ScriptAlias /lg /var/www/looking-glass/lg/lg.cgi
+  <Directory "/var/www/looking-glass/lg">
+    AllowOverride None
+    Options +ExecCGI
+    AddHandler cgi-script .cgi .pl
+    Require all granted
+  </Directory>
+</VirtualHost>
+</code>
+We need to turn on support for CGI:
+<code>
+sudo a2enmod cgid
+</code>
+Then we need to enable the site:
+<code>
+sudo a2ensite lg.my.site
+</code>
+and then restart Apache2 for it to go live:
+<code>
+sudo systemctl restart apache2
+</code>
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