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

Backing up and restoring the system

Disasters can occur at any time. Risk is everywhere. In this respect, backing up your system is of utmost importance and needs to be done regularly. It is always better to practice good prevention than to recover from data loss and learn this the hard way.

Backup and recovery need to be done based on a well-thought-out strategy and need to take the RTO and RPO factors into consideration. RTO should answer basic questions such as how fast to recover lost data and how this will affect the business operations, while RPO should answer questions such as how much of your data you can afford to lose.

There are different types and methods of backup. The following are some examples:

Figure 10.1 – Backup methods and types

Figure 10.1 – Backup methods and types

When doing a backup, keep the following rules in mind:

  • The 321 rule, which means that you should always have three copies of your data saved on two separate mediums. One backup should always...