Bastille: classic Linux and Unix security
The glamorous new kids in the Linux security parade are SELinux, AppArmor, and all manner of virtualization technologies. (Though it is being discovered that virtual machines, just like chroot jails, aren't all that difficult to break out of, so don't count on them for strong security.)
But don't overlook the reliable, helpful old-timer Bastille Linux. Bastille Linux is both a batch of Perl scripts that lead you through hardening your Linux system, and an educational tool. I recommend running it just to get a grounding in basic security measures — the newfangled things are nice, but the basics are still important and valuable.
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