admin – Page 9 – ITFROMZERO – Share tobe shared!

MySQL Database Backup and Restore: Practical Lessons from Production

By admin March 6, 2026

A practical guide to MySQL database backup and restore based on real experience with a 50GB production database. Compares mysqldump, mysqlpump, and XtraBackup, with automation scripts and the 3-2-1 backup strategy.

Network

Measuring Network Speed and Performance with iperf3 on Linux Server

By admin March 6, 2026

A guide to using iperf3 to measure real-world bandwidth between two Linux servers, detect packet loss and jitter with UDP mode, and write time-based monitoring scripts to catch intermittent issues. Includes comparisons with speedtest-cli and netperf to help you pick the right tool for each scenario.

Virtualization

KVM Live Migration with virsh: Move VMs Between Hosts Without Downtime

By admin March 6, 2026

Live migration lets you move a running KVM virtual machine to another host without shutting it down. This guide walks through setting up NFS shared storage, configuring libvirtd for remote access, and performing the migration with virsh — including real-time monitoring and solutions to common errors.

Python

Task Scheduling with Python APScheduler: Comparing cron, schedule, and APScheduler

By admin March 6, 2026

A comparison of three task scheduling approaches in Python: cron, the schedule library, and APScheduler. Analyzes the trade-offs of each approach and walks through practical APScheduler implementation using interval, cron, and date triggers with real-world error handling.

Virtualization

How to Use libvirt to Manage KVM Virtual Machines from the Command Line (virsh)

By admin March 6, 2026

A complete virsh reference — the libvirt CLI tool for managing KVM virtual machines on Linux. Covers creating VMs, snapshots, cloning, monitoring, and debugging frozen VMs in the middle of the night. A practical guide for admins working without a GUI.

Linux

Monitoring Linux System Resources with htop and iotop: A Practical Guide

By admin March 6, 2026

A practical guide to using htop and iotop for monitoring CPU, RAM, and disk I/O on Linux servers. Covers metric interpretation, practical keyboard shortcuts, common bottleneck diagnostic scenarios, and automated monitoring scripts.

Centos

Managing Services with firewalld on CentOS/RHEL: A Practical Guide

By admin March 6, 2026

firewalld is the default firewall management tool on CentOS/RHEL, offering flexible zone-based policies that are easier to manage than plain iptables. This article covers practical usage from quick start to rich rules, port forwarding, and tips drawn from real production server management.

Artificial Intelligence tutorial - IT technology blog

IronClaw Installation Guide: A Rust-Written AI Assistant Focused on Security and Privacy

By admin March 6, 2026

IronClaw is a Rust-written CLI AI assistant that runs entirely locally and never transmits data externally — a practical solution for developers who need AI assistance while working with sensitive data. This guide covers everything from installation and Ollama backend configuration to security setup and real-world daily workflows.

Centos

Configuring SELinux on Rocky Linux: Don’t Disable It Before You Understand What It Does

By admin March 6, 2026

From firsthand experience migrating 5 servers off CentOS 8 EOL to Rocky Linux, this guide covers how to configure SELinux properly — from Permissive for debugging to Enforcing on production — with practical audit2allow, sealert, and semanage examples.

Network

How to Use nmap for Network Scanning and Linux Server Security Auditing

By admin March 6, 2026

A practical guide to using nmap for port scanning, service detection, and Linux server security auditing — drawn from real infrastructure management experience. Covers basic commands, NSE scripts, and an automation script for weekly audits.