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

Running a container using Podman and UBI

Now that you have the container tools from the Application Stream repository installed, let’s run a simple container based on Red Hat UBI that contains a set of official container images and extra software based on RHEL. To run a UBI image, it only takes a single command, as illustrated in the following code snippet:

[root@rhel-instance ~]# podman run –it registry.access.redhat.com/ubi9/ubi bash
Trying to pull registry.access.redhat.com/ubi9:latest...
Getting image source signatures
Checking if image destination supports signatures
Copying blob bf30f05a2532 done
Copying blob c6e5292cfd5f done
Copying config 168c58a383 done
Writing manifest to image destination
Storing signatures
[root@e38453f5e055 /]#

Check the hostname; it has changed from rhel-instance to e38453f5e055, which means we are inside the container.

Tip

These tutorials run commands as root, but one of the benefits of Podman is that it can run containers...