Book Image

Linux for System Administrators

By : Viorel Rudareanu, Daniil Baturin
Book Image

Linux for System Administrators

By: Viorel Rudareanu, Daniil Baturin

Overview of this book

Linux system administration is an essential aspect of maintaining and managing Linux servers within an organization. The role of a Linux system administrator is pivotal in ensuring the smooth functioning and security of these servers, making it a critical job function for any company that relies on Linux infrastructure. This book is a comprehensive guide designed to help you build a solid foundation in Linux system administration. It takes you from the fundamentals of Linux to more advanced topics, encompassing key areas such as Linux system installation, managing user accounts and filesystems, networking fundamentals, and Linux security techniques. Additionally, the book delves into the automation of applications and infrastructure using Chef, enabling you to streamline and optimize your operations. For both newcomers getting started with Linux and professionals looking to enhance their skills, this book is an invaluable hands-on guide with a structured approach and concise explanations that make it an effective resource for quickly acquiring and reinforcing Linux system administration skills. With the help of this Linux book, you’ll be able to navigate the world of Linux administration confidently to meet the demands of your role.
Table of Contents (21 chapters)
Part 1: Linux Basics
Part 2: Configuring and Modifying Linux Systems
Part 3: Linux as a Part of a Larger System

Keeping your system secure

A common joke in information security circles is that the only perfectly secure system is one that is powered off. Such a system is only secure in the sense of integrity and confidentiality, of course – at the cost of availability. Any realistic scenario is always a compromise and there is always a risk; the system administrator’s goal is to prevent known attacks and reduce the impact of unknown ones, and every administrator must always be ready to respond to new threats and mitigate them.

Luckily, following simple guidelines can considerably reduce the risk – let’s discuss the general strategies and tactics to prevent specific attack types.

Reducing the attack surface

A system’s attack surface is, roughly speaking, the set of all ways to access it. For example, a machine that is running a web server and also a mail server has a larger attack surface than a system that only runs one of those. If we assume that vulnerabilities...