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Red Hat Enterprise Linux 9 Administration

You're reading from   Red Hat Enterprise Linux 9 Administration A comprehensive Linux system administration guide for RHCSA certification exam candidates

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Product type Paperback
Published in Nov 2022
Publisher Packt
ISBN-13 9781803248806
Length 530 pages
Edition 2nd Edition
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Authors (4):
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Scott McCarty Scott McCarty
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Scott McCarty
Miguel Pérez Colino Miguel Pérez Colino
Author Profile Icon Miguel Pérez Colino
Miguel Pérez Colino
Pedro Ibañez Requena Pedro Ibañez Requena
Author Profile Icon Pedro Ibañez Requena
Pedro Ibañez Requena
Pablo Iranzo Gómez Pablo Iranzo Gómez
Author Profile Icon Pablo Iranzo Gómez
Pablo Iranzo Gómez
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Toc

Table of Contents (26) Chapters Close

Preface 1. Part 1 – Systems Administration – Software, User, Network, and Services Management
2. Chapter 1: Getting RHEL Up and Running FREE CHAPTER 3. Chapter 2: RHEL 9 Advanced Installation Options 4. Chapter 3: Basic Commands and Simple Shell Scripts 5. Chapter 4: Tools for Regular Operations 6. Chapter 5: Securing Systems with Users, Groups, and Permissions 7. Chapter 6: Enabling Network Connectivity 8. Chapter 7: Adding, Patching, and Managing Software 9. Part 2 – Security with SSH, SELinux, a Firewall, and System Permissions
10. Chapter 8: Administering Systems Remotely 11. Chapter 9: Securing Network Connectivity with firewalld 12. Chapter 10: Keeping Your System Hardened with SELinux 13. Chapter 11: System Security Profiles with OpenSCAP 14. Part 3 – Resource Administration – Storage, Boot Process, Tuning, and Containers
15. Chapter 12: Managing Local Storage and Filesystems 16. Chapter 13: Flexible Storage Management with LVM 17. Chapter 14: Advanced Storage Management with Stratis and VDO 18. Chapter 15: Understanding the Boot Process 19. Chapter 16: Kernel Tuning and Managing Performance Profiles with tuned 20. Chapter 17: Managing Containers with Podman, Buildah, and Skopeo 21. Part 4 – Practical Exercises
22. Chapter 18: Practice Exercises – 1 23. Chapter 19: Practice Exercise – 2 24. Index 25. Other Books You May Enjoy

Restoring changed file contexts to the default policy

In the previous section, we mentioned how semanage enables us to perform changes to the policy, which is the recommended way to perform changes and to persist them for future files and folders, but that is not the only way we can perform operations.

From the command line, we can use the chcon utility to change the context for a file. This will allow us to define the user, the role, and the type for the file we want to alter, and similar to other filesystem utilities such as chmod or chown, we can also affect files recursively, so it’s easy to set a full folder hierarchy to the desired context.

One feature that I always found very interesting is the ability to copy the context of a file via the --reference flag so that the same context as the referenced file is applied to the target one.

When we were introducing the example of httpd earlier in this chapter, we did a test with two files, index1.htm and index2.htm,...

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