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Configuring Fail2ban to Protect Your Ubuntu Server from Brute-Force Attacks

By admin March 6, 2026

Fail2ban automatically blocks brute-force IPs targeting SSH, Nginx, and WordPress by reading logs and adding iptables rules. This guide covers installation, practical jail configuration, and common troubleshooting scenarios on Ubuntu 22.04.

Fedora

Managing Container Images with Podman on Fedora: Build, Push, and Pull from Registry

By admin March 6, 2026

A practical guide to managing container images with Podman on Fedora: comparing Podman CLI vs Docker CE vs Podman Desktop, then walking through building an image from a Containerfile, pushing to Docker Hub/GitHub Container Registry, pulling it back, plus tips for cleanup and offline image transfer.

Network

Using tcpdump and Wireshark to Effectively Analyze Network Traffic

By admin March 6, 2026

A hands-on guide to combining tcpdump and Wireshark for capturing and analyzing network traffic on Linux servers. Covers everything from basic filter commands to advanced intermittent packet loss debugging, with production-ready optimization tips.

VMware

VMware VM Performance Optimization: A Real-World Checklist from Production

By admin March 6, 2026

Six months managing an 8-host ESXi VMware cluster: choosing the right disk adapter (PVSCSI), network adapter (VMXNET3), controlling the balloon driver, handling long snapshot chains, and monitoring with esxtop. A practical checklist that brought CPU ready time down from 8% to under 2%.

VMware

Installing VMware Workstation and Creating Your First VM: A Hands-On Guide

By admin March 6, 2026

A hands-on guide to installing VMware Workstation Pro (free since 2024) and creating your first Ubuntu Server VM — version comparisons, optimal configuration, snapshots, and tips from real-world experience.

MySQL

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.

virt-v2v Guide: Easily Convert Virtual Machines from VMware, Hyper-V to KVM

Configuring VLAN on Linux: Network Isolation, Enhanced Security, and Easy Management

Nginx TLS 1.3 Configuration Guide and Cipher Suite Optimization: Achieve A+ on SSL Labs

How to Use Google Gemini API with Python: Efficient Implementation from Basics to Production

Efficient Physical to Virtual (P2V) Server Migration with VMware vCenter Converter Standalone

Guide to configuring SMS and Telegram alerts with Alertmanager

Guide to Installing and Optimizing MongoDB for Production Environments

VirtualBox: Advanced Network Configuration – Shared Folders, VPN, and Isolated Environments for IT

Zabbix Installation Guide from A-Z: Build Your Own Professional Monitoring System

Guide to Configuring SSH Tunnel: Local, Remote, and Dynamic Port Forwarding

Configuring Fail2ban to Protect Your Ubuntu Server from Brute-Force Attacks

Managing Container Images with Podman on Fedora: Build, Push, and Pull from Registry

Using tcpdump and Wireshark to Effectively Analyze Network Traffic

VMware VM Performance Optimization: A Real-World Checklist from Production

Installing VMware Workstation and Creating Your First VM: A Hands-On Guide

MySQL Database Backup and Restore: Practical Lessons from Production

Measuring Network Speed and Performance with iperf3 on Linux Server

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

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

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