Creating a simple service monitoring CGI script

If you're responsible for more than one web server, or multiple services on one or many servers (SSH, FTP, Web, etc). It can be a little difficult to make sure all your services are up and running. There are several programs on the web that assist in monitoring servers, some of which even email you when a machine or service goes down. Since we're trying to learn more about Perl, though, let's roll our own simple CGI solution for monitoring the status of multiple servers and services.