Book Image

Red Hat Enterprise Linux 9 Administration - Second Edition

By : Pablo Iranzo Gómez, Pedro Ibáñez Requena, Miguel Pérez Colino, Scott McCarty
2 (2)
Book Image

Red Hat Enterprise Linux 9 Administration - Second Edition

2 (2)
By: Pablo Iranzo Gómez, Pedro Ibáñez Requena, Miguel Pérez Colino, Scott McCarty

Overview of this book

With Red Hat Enterprise Linux 9 becoming the standard for enterprise Linux used from data centers to the cloud, Linux administration skills are in high demand. With this book, you’ll learn how to deploy, access, tweak, and improve enterprise services on any system on any cloud running Red Hat Enterprise Linux 9. Throughout the book, you’ll get to grips with essential tasks such as configuring and maintaining systems, including software installation, updates, and core services. You’ll also understand how to configure the local storage using partitions and logical volumes, as well as assign and deduplicate storage. You’ll learn how to deploy systems while also making them secure and reliable. This book provides a base for users who plan to become full-time Linux system administrators by presenting key command-line concepts and enterprise-level tools, along with essential tools for handling files, directories, command-line environments, and documentation for creating simple shell scripts or running commands. With the help of command line examples and practical tips, you’ll learn by doing and save yourself a lot of time. By the end of the book, you’ll have gained the confidence to manage the filesystem, users, storage, network connectivity, security, and software in RHEL 9 systems on any footprint.
Table of Contents (26 chapters)
1
Part 1 – Systems Administration – Software, User, Network, and Services Management
9
Part 2 – Security with SSH, SELinux, a Firewall, and System Permissions
14
Part 3 – Resource Administration – Storage, Boot Process, Tuning, and Containers
21
Part 4 – Practical Exercises

Listing, creating, copying, and moving files, directories, links, and hard links

It is important to know how to manage files and directories in a system from the command line. It will serve as the basis for managing and copying important data, such as configuration files or data files.

Directories

Let’s start by creating a directory to keep some working files. We can do so by running mkdir, short for “make directory”:

[user@rhel-instance ~]$ mkdir mydir
[user@rhel-instance ~]$ ls -l
total 0
drwxrwxr-x. 2 user user 6 Feb 13 19:53 mydir

Folders can be deleted with the rmdir command, short for “remove directory”:

[user@rhel-instance ~]$ ls -l
total 0
drwxrwxr-x. 2 user user 6 Feb 13 19:53 mydir
[user@rhel-instance ~]$ mkdir deleteme
[user@rhel-instance ~]$ ls -l
total 0
drwxrwxr-x. 2 user user 6 Feb 13 20:15 deleteme
drwxrwxr-x. 2 user user 6 Feb 13 19:53 mydir
[user@rhel-instance ~]$ rmdir deleteme
[user@rhel-instance ~]$ ls -l
total...