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

Remote file management with SCP/rsync

Similar to telnet, which was replaced with ssh on many devices and systems, using insecure solutions for file transfer is being reduced. By default, the File Transfer Protocol (FTP) uses Transmission Control Protocol (TCP) port 21, but since communication happened in plain text, it was a perfect target for intercepting credentials. FTP is still used today, mostly for serving files on servers that only allow anonymous access and wish to move to more secure options.

SSH usually enables two interfaces for copying files: scp and sftp. The first one is used in a similar way to the regular cp command, but here, we’re accepting remote hosts as our target or source, while sftp uses a client approach similar to the traditional ftp command that interacts with FTP servers. Just remember that in both cases, the connection is encrypted and happens over port 22/tcp on the target host.

We’ll dig into scp in the next section.

Transferring...