We learned some basic facts about securing a Linux-based Moodle server: What web server and database server we need to use, how to install and configure MySQL, PHP, and Apache,.and what hat alternatives are available for MySQL and PHP. Explanation was given about file security system in Linux and the reader will feel more comfortable next time he sees acronyms like DAC, ACL, MAC, and SELinux. Next stop—how to transform your Windows server into an impenetrable fortress!