Book Image

Mastering Linux Administration

By : Alexandru Calcatinge, Julian Balog
Book Image

Mastering Linux Administration

By: Alexandru Calcatinge, Julian Balog

Overview of this book

Linux plays a significant role in modern data center management and provides great versatility in deploying and managing your workloads on-premises and in the cloud. This book covers the important topics you need to know about for your everyday Linux administration tasks. The book starts by helping you understand the Linux command line and how to work with files, packages, and filesystems. You'll then begin administering network services and hardening security, and learn about cloud computing, containers, and orchestration. Once you've learned how to work with the command line, you'll explore the essential Linux commands for managing users, processes, and daemons and discover how to secure your Linux environment using application security frameworks and firewall managers. As you advance through the chapters, you'll work with containers, hypervisors, virtual machines, Ansible, and Kubernetes. You'll also learn how to deploy Linux to the cloud using AWS and Azure. By the end of this Linux book, you'll be well-versed with Linux and have mastered everyday administrative tasks using workflows spanning from on-premises to the cloud. If you also find yourself adopting DevOps practices in the process, we'll consider our mission accomplished.
Table of Contents (20 chapters)
Section 1: Linux Basic Administration
Section 2: Advanced Linux Server Administration
Section 3: Cloud Administration

Chapter 5: Working with Processes, Daemons, and Signals

Linux is a multitasking operating system. Multiple programs or tasks can run in parallel, each with its own identity, scheduling, memory space, permissions, and system resources. Processes encapsulate the execution context of any such program. Understanding how processes work and communicate with each other is an important skill for any seasoned Linux system administrator and developer to have.

This chapter explores the basic concepts behind Linux processes. We'll look at different types of processes, such as foreground and background processes, with special emphasis being placed on daemons as a particular type of background process. We'll closely study the anatomy of a process and various inter-process communication mechanisms in Linux – signals in particular. Along the way, we'll learn about some of the essential command-line utilities for managing processes and daemons and working with signals.