Up until now, Linux administration books have focused on the management of a single server. This is the first Linux administration guide specifically focused on the needs of administrators working in production/enterprise environments that may consist of hundreds or even thousands of servers which must be managed centrally to deliver optimal availability and performance. The book contains extensive coverage of Linux security; working with drivers and the kernel; TCP/IP networking; routing; network hardware; and NFS configuration. It also presents comprehensive, step-by-step guidance for configuring and managing email with sendmail; network management and debugging; using Linux in Web hosting environments; automating administration with daemons; and integrating with Windows clients and servers.
Of the books devoted to general Linux system administration, this is by far the most in-depth that I have seen. Even though the book is huge, it still is only able to provide limited coverage of many topics since many of those same topics have entire books devoted just to them. Nonetheless, this is still a good place to look for system administration information if you want more than the very shallow coverage provided by most system administration books.
I was a little worried, since this book wasn't ever going to be part of my shelf of O'Reilly Books. However, this book provides excellent, concise coverage of a variety of topics that a Linux Systems Administrator is likely to encounter. It doesn't cover any one topic in great depth, instead suggesting the appropriate O'Reilly book. I strongly recommend it when you find you need a broad overview of Systems Administration.
This was my first Linux-specific system administration book (aside from man pages) and it treated me very well. Evi et al have written a comprehensive and accessible bible for new and seasoned linux admins alike. This book is always within arm's reach in my office.