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Close to the Chest  

Chat servers likely send confidential data to the cloud, so if you don't want to see your business talks on Google or Amazon, you can keep your information safely in your own data center with self-hosted options – and without compromising on convenience.

Self-Worth  

Exploring my worth as a system administrator.

Weathering the Storm  

The Kopia open source system for automating the creation and transfer of backups supports a wide range of remote storage devices, making it particularly useful as a backup tool in cloud environments. The convenient GUI for Windows installations holds its own against commercial products, despite its short development history.

Inspector  

Learn how to develop a simple yet effective port scanner to analyze network security.

Phone Booth  

FreePBX is a first-class replacement for commercial phone systems, even in complex setups.

Baseline  

Puppet lets you enforce consistent, secure workstation configurations by emphasizing the use of declarative infrastructure and system-level protections such as chattr and systemd to prevent unauthorized changes and support a resilient security posture.

One Step Ahead  

Nmap and Nessus can help you search for vulnerabilities on Active Directory domain controllers and shut them down. We show you how to use Nmap scans, set up Nessus, and test a DC.

Blocked  

We assess the effectiveness of SELinux in protecting AI model deployments on RHEL 9, demonstrating its ability to block unauthorized access, modification, and resource exploitation through mandatory access control.