CentOS tutorial - IT technology blog

How to Use sosreport on CentOS Stream 9: Collect and Analyze System Information for Professional Troubleshooting

sosreport is Red Hat's official tool for collecting complete system information with a single command, replacing the need to run dozens of manual commands every time an incident occurs. This article compares different approaches to information gathering, weighs their pros and cons, and walks through a practical sosreport deployment on CentOS Stream 9 — including a script you can integrate directly into your incident response workflow.
Virtualization tutorial - IT technology blog

QEMU Guest Agent: Installation and Configuration on Linux/Windows for Consistent Snapshots and VM Monitoring

QEMU Guest Agent (qemu-ga) is a daemon running inside the VM that freezes the filesystem before snapshots are taken, ensuring data consistency and preventing corruption on restore. This guide covers installation on Linux and Windows, configuration with KVM/libvirt and Proxmox, plus troubleshooting for common issues.
Linux tutorial - IT technology blog

Landlock LSM on Linux: Sandbox Applications Without Root Using Built-in Kernel Security

Landlock LSM is a security module built into the Linux kernel since version 5.13, allowing applications to restrict their own filesystem access without root privileges. This post shares real-world deployment experience on Ubuntu 22.04 in production over six months: Python examples using ctypes, wrapping binaries with landlockrun, and combining with systemd hardening.