Hardening Linuxby James Turnbull belongs on the shelf of anyone who installs and maintains Linux servers. - Ray Lodato, Slashdot ContributorI felt like I learned more about Linux reading this book than I've learned during the last year at work. - Lasse Koskela, JavaRanch SheriffI thinkHardening Linuxmay be the best example I've seen of a practical book on the subject. - Anomaly - G. Wade JohnsonI was a bit surprised when I scanned the table of contents. The first thought in my head was, 'hey, this has everything in it.' And it does. - Joe Topjian, Adminspotting.net"Hardening" is the process of protecting a system and its applications against unknown threats.Hardening Linuxidentifies many of the risks of running Linux hosts and applications and provides practical examples and methods to minimize those risks. The book is written for Linux/UNIX administrators who do not necessarily have in-depth knowledge of security but need to know how to secure their networks.In this book, you'll learn how to secure: The base operating system and firewall with iptables Connections to your hosts Fie systems and files Email servers IMAP and POP servers FTP serversA quick reference of the procedures discussed in each chapter are summarized in Appendix C.