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Oracle Linux Cookbook

Oracle Linux Cookbook

By : Erik Benner, Erik B. Thomsen, Jonathan Spindel
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Oracle Linux Cookbook

Oracle Linux Cookbook

5 (4)
By: Erik Benner, Erik B. Thomsen, Jonathan Spindel

Overview of this book

Discover the power of Oracle Linux 8, the free and enterprise-grade Linux distribution designed for use in any environment, with this recipe-style book. Starting with instructions on how to obtain Oracle Linux for both X86 and ARM-based platforms, this book walks you through various installation methods, from running it as a Windows service to installing it on a Raspberry Pi. It unravels advanced topics such as system upgrades using Leapp for major version transitions and using a PXE server and kickstart files for more advanced installations. The book then delves into swapping kernels to take advantage of Oracle’s UEK, exploring boot options, managing software with DNF, and achieving high availability. Detailed recipes involving security topics will assist with tasks such as data encryption, both at rest and in motion. For developers, it offers guidance on building RPM files, using Docker and Podman in a containerized environment, working with AppStreams, and more. For large-scale deployments, the book introduces Oracle Linux Automation Manager for enterprise-level Ansible utilization, from setting up the Ansible server to basic playbook writing. Finally, you’ll discover strategies for cloud migration. By the end of this book, you’ll possess a comprehensive toolkit that will elevate your skills as a Linux administrator.
Table of Contents (16 chapters)
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14
Index
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Port protection and restricting network access

Oracle Linux has a firewall built into the distribution. This firewall is called firewalld, short for firewall daemon. firewalld is a dynamic firewall management tool used on Linux systems that provides a simple and consistent way to manage firewall rules across different distributions. It is designed to allow administrators to manage firewall rules in a flexible and efficient way.

Getting ready

As with the other test, we will need an Oracle Linux system to play with. Nothing else is required. The system is enabled by default on most installations. To check the status of the daemon, you can use the systemctl command as follows:

systemctl status firewalld

The output is displayed in the following screenshot:

Figure 9.16 – firewalld status

Figure 9.16 – firewalld status

How to do it…

You can see the current configuration using the firewall-cmd with the --list-all option:

[root@ol8 ~]# firewall-cmd --list-all
...

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