Server security doesn’t need to be complicated. My security philosophy is simple: adopt principles that will protect you from the most frequent attack vectors, while keeping administration efficient enough that you won’t develop “security cruft”. If you use your first 5 minutes on a server wisely…

A great walk through to locking down a linux server.

Link: My First 5 Minutes On A Server; Or, Essential Security for Linux Servers | Bryan Kennedy via plusbryan.com