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

Managing permissions

A key tenet of Linux is the ability to allow multiple users to access the system while performing independent tasks simultaneously. The smooth operation of this multiuser, multitasking environment is controlled via permissions. The Linux kernel provides a robust framework for the underlying security and isolation model. At the user level, dedicated tools and command-line utilities help Linux users and system administrators with the related permission management tasks.

For some Linux users, especially beginners, Linux permissions may appear confusing at times. This section attempts to demystify some of the key concepts about file and directory permissions in Linux. You will learn about the basic permission rights of accessing files and directories—the read, write, and execute permissions. We explore some of the essential administrative tasks for viewing and changing permissions, using system-level command-line utilities.

Most of the topics discussed...