Posted inLinux
Protecting Linux Files From Root: Mastering chattr and lsattr
Root privileges aren't the final word. Discover the power of chattr and lsattr to lock files, prevent accidental deletion, and harden your Linux server security.
Posted inLinux
Mastering OverlayFS: How to Create an ‘Undo Button’ for Your Linux System
Learn how to use OverlayFS on Linux to protect system data. This article provides a detailed guide on the Copy-on-Write mechanism and how to create a secure sandbox environment.
Posted inCentos
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.
Posted inNetwork
Configuring iSCSI Multipathing on Linux: Maximize Bandwidth and SAN Connection Redundancy
A complete guide to configuring iSCSI Multipathing on Linux, from basic setup to advanced tuning: establish multiple parallel connections to SAN storage to increase bandwidth and ensure redundancy when a path fails. Covers load balancing configuration, jumbo frames, real-world failover testing, and troubleshooting.
Posted inVirtualization
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.
Posted inMonitoring
Monitoring Systemd with Prometheus: Don’t Let Your Server Stay ‘Alive’ While Your App Is ‘Dead’
Don't let a green dashboard fool you when internal services have crashed. Detailed guide on using Prometheus Systemd Exporter to monitor uptime and handle Linux service errors effectively.
Posted inFedora
Dual Boot Fedora Linux and Windows 11: Configuring UEFI, Secure Boot, and GRUB2 for Safe Parallel Booting
A guide to setting up Fedora Linux and Windows 11 dual boot on UEFI, keeping Secure Boot enabled through MOK enrollment, properly partitioning the EFI partition, and recovering GRUB2 after Windows Update overwrites the boot entry.
Posted inUbuntu
Ubuntu Frame: The ‘All-in-one’ Solution for Kiosks and Embedded Displays on Wayland
Ubuntu Frame is a modern X11 replacement for building Kiosk displays and embedded devices. A detailed guide on installation, screen rotation, and running a smooth Web Kiosk.
Posted inVirtualization
Enable Hyper-V on Windows 11 and Create Virtual Machines with PowerShell: Practical Tips for Developers
A guide to enabling Hyper-V on Windows 11 and creating Linux/Windows VMs with PowerShell — from checking CPU support and creating virtual switches to automation scripts that spin up an Ubuntu VM in minutes. Practical tips for developers who need a Linux environment directly on their Windows machine without installing extra software.
Posted inFedora
Setting Up WireGuard VPN on Fedora Server: Secure Remote Access with firewalld and SELinux
A complete guide to setting up WireGuard VPN on Fedora Server, covering firewalld, SELinux, and IP forwarding configuration. Includes a script to auto-generate client configs and practical debugging tips.