Linux Archives - Page 14 of 33 - ITFROMZERO

How to Set Up a Self-Hosted Git Bare Repository on Linux via SSH: Share Code in Small Teams Without Gitea or GitHub

By IT From Zero June 25, 2026

Self-host a Git server in 10 minutes using a bare repository over SSH — no Gitea, no GitHub, no extra software required. Perfect for small teams of 2–5 people who want secure, simple, low-maintenance internal code sharing.

Linux

How to Configure kdump on Linux: Collecting Kernel Crash Dumps and Analyzing Critical System Failures

By IT From Zero June 25, 2026

kdump captures the entire state of RAM at the moment of a kernel panic — before the system has a chance to reboot. It is the only tool that allows sysadmins to investigate the root cause of a server crash when the logs record nothing. This guide covers installing and configuring kdump on RHEL/CentOS/Ubuntu, safely triggering a test crash, and analyzing vmcore files with the crash tool.

Network

Linux Bandwidth Monitoring: Identify Network-Hogging Processes with Nethogs and Iftop

By IT From Zero June 25, 2026

Master Nethogs and Iftop to analyze bandwidth by PID and IP. This article shares real-world scenarios for troubleshooting midnight server network congestion.

Linux

Automated Temporary File Management with systemd-tmpfiles: Don’t Let Your Server Die from Junk

By IT From Zero June 25, 2026

Avoid server downtime due to full disks. Learn how to use systemd-tmpfiles to automatically clean up temporary files and manage Linux system directories professionally and safely.

Security

Gophish: Build Your Own Phishing Simulation System for Internal Security Testing and Training on Linux

By IT From Zero June 24, 2026

Gophish is an open-source tool that lets you run internal phishing simulations without paying for an expensive external service. This guide covers installation, end-to-end campaign configuration, and how to analyze results to genuinely improve your team's security awareness.

Linux

Protecting Linux Files From Root: Mastering chattr and lsattr

By IT From Zero June 22, 2026

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.

Linux

Mastering OverlayFS: How to Create an ‘Undo Button’ for Your Linux System

By IT From Zero June 22, 2026

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.

Centos

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

By IT From Zero June 20, 2026

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.

Network

Configuring iSCSI Multipathing on Linux: Maximize Bandwidth and SAN Connection Redundancy

By IT From Zero June 20, 2026

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.

Virtualization

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

By IT From Zero June 20, 2026

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.