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

Logical Volume Management in Linux

Some of you may have already heard of LVM. For those who do not know what it is, we will explain it shortly in this section. Imagine a situation where your disks run out of space. You can always move it to a larger disk and then replace the smaller one, but this implies system restarts and unwanted downtimes. As a solution, you can consider LVM, which offers more flexibility and efficiency. By using LVM, you can add more physical disks to your existing volume groups, while still in use. This still offers the possibility to move data to a new hard drive, but with no downtime, everything is done while filesystems are online.

As we don't have a system with LVM, we will show you the steps necessary to create new LVM volumes by using the 1 TB drive on our system and we will make it an LVM physical volume:

  1. Create the LVM physical volume with the pvcreate command:
    Figure 6.12 – Using pvcreate to create an LVM physical volume

    Figure 6.12 – Using pvcreate to create an LVM physical volume

  2. Create...