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


In this chapter, we learned that process startup is not a trivial operation, and even native code binaries are not simply loaded into memory byte by byte. We learned how to explore the process tree with the pstree command, how to force processes to terminate or reload with kill, and how to examine and interpret exit codes.

We also learned that the kernel communicates with running processes using POSIX signals, that different signals have different meanings, and that there are more signals than what the kill command allows the user to send. Apart from SIGTERM or SIGKILL, which are sent by users or userspace tools, there are many signals that the kernel uses to indicate programming errors and special conditions. Among them are SIGILL, for programs that attempt to execute illegal CPU instructions, and SIGPIPE, for cases when a connection is closed by the other side.

In the next chapter, we will learn how to discover and examine the hardware installed in a machine running...