When setting up a Linux system, security is supposed to be an important part of all stages. A good knowledge of the fundamentals of Linux is essential to implementing a good security policy on the machine.
Linux, as it ships, is not completely secure, and it is the responsibility of the administrator to configure the machine in a way such that it becomes more secure. Practical Linux Security Cookbook will work as a practical guide for administrators and help them configure a more secure machine.
If you want to learn about Kernel configuration, filesystem security, secure authentication, network security, and various security tools for Linux, this book is for you.
Linux security is a massive subject and not everything can be covered in just one book. Still, Practical Linux Security Cookbook will give you a lot of recipes to help you secure your machine.