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pram wrote: » There are actually few books on hardening Linux, unfortunately. The best one I've read that is at least current is Linux Firewalls by ApressAmazon.com: Linux Firewalls: Attack Detection and Response with iptables, psad, and fwsnort (9781593271411): Michael Rash: Books I really like this book because it not only goes into depth about iptables, but also covers and psad and fwsnort. O'Reilly has a few but they are all extremely old and one of them focuses on Bastille which is dead (afaik) In addition to the book above, I recommend you take a look at CSF. It makes managing iptables a lot simpler:ConfigServer Security & Firewall For general Administration, theres still nothing better than the Unix Handbook IMO. Its more a reference than a step-by-step guide though:UNIX and Linux System Administration Handbook (4th Edition): Evi Nemeth, Garth Snyder, Trent R. Hein, Ben Whaley: 9780131480056: Amazon.com: Books Unfortunately there are few resources on optimization since, generally speaking, that could mean any one of a thousand individual subjects (apache, mysql, kernel, etc etc)
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