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

Working with networking services

In this section, we enumerate some of the most common network services running on Linux. Not all the services mentioned here are installed or enabled by default in your Linux platform of choice. Chapter 8, Configuring Linux Servers, and Chapter 9, Securing Linux, go into how to install and configure some of them. Our focus in this section remains on what these networking services are, how they work, and the networking protocols they use for communication.

A network service is typically a system process implementing an application layer (OSI Layer 7) functionality for data communication purposes. Network services are usually designed as peer-to-peer or client-server architectures.

In peer-to-peer networking, multiple network nodes each run their own equally privileged instance of a network service while sharing and exchanging a common set of data. Take, for example, a network of DNS servers, all sharing and updating their domain name records.