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Networking tutorial - IT technology blog

Installing and Configuring OpenNMS Horizon on Linux: Enterprise Network Monitoring with SNMP Auto-Discovery and Threshold Alerting

August 27, 2026

A six-month production review of OpenNMS Horizon on Ubuntu Linux, covering SNMP auto-discovery across 180+ network devices, threshold alerting with hysteresis, and performance collection setup. Includes complete installation steps and real configuration examples.

Linux

Build Your Own Custom Ubuntu ISO: A Practical Guide to Cubic

August 12, 2026

Ditch the repetitive setup scripts. This guide shows you how to use Cubic to create a custom Ubuntu ISO with pre-installed tools, specific kernels, and tailored configurations.

DevOps

Stop Overpaying for Hosting: Build Your Own PaaS with Dokku on Ubuntu

August 8, 2026

Tired of manual server configurations? Learn how to build your own personal PaaS using Dokku on Ubuntu. Deploy apps with a single git push and automate your SSL and databases.

Networking

4G/5G USB Modem Failover on Ubuntu Server with ModemManager and NetworkManager

July 17, 2026

After three fiber outages in six months, I configured automatic 4G/5G USB modem failover on Ubuntu Server using ModemManager and NetworkManager. Six months later, it's handled seven more disruptions without a single manual action — here's the exact setup I'm still running in production.

Networking

Build a Virtual Network Lab with EVE-NG on Ubuntu: Simulate Cisco, Juniper, and MikroTik for CCNA/CCNP

June 29, 2026

After six months of daily use, EVE-NG on Ubuntu has replaced my entire physical network lab for CCNA and CCNP study. This guide covers installation, adding Cisco IOS and MikroTik RouterOS images, and building your first multi-vendor topology — all from a browser, on hardware that costs under $300.

Linux

Linux CPU Frequency Scaling with cpupower and cpufreq-utils: Boost Performance and Save Power

June 16, 2026

CPU frequency scaling governors directly affect how fast your Linux system responds under load. This guide walks through using cpupower and cpufreq-utils to inspect, change, and persist governor settings on both servers and laptops, with real command examples and tips from production deployments.

Linux

Migrating from X11 to Wayland on Linux: Fix Incompatible Apps and Optimize Your Desktop on Ubuntu and Arch Linux

June 16, 2026

A field-tested guide to switching from X11 to Wayland on Ubuntu and Arch Linux — covering XWayland compatibility, screen sharing fixes, Electron app flags, clipboard quirks, and CJK input setup. Built from real migration experience, with commands that actually work.

Linux

Linux Locale, Encoding, and Timezone: UTF-8 and Multi-Region Server Configuration Guide

June 13, 2026

Misconfigured locale and timezone are behind countless production bugs — from garbled non-ASCII characters to log timestamps that are hours off. This guide walks through setting up UTF-8 locale, system timezone, and correct encoding for Python scripts and systemd services on Ubuntu, RHEL, and inside Docker containers.

Linux

Stop Disk Space Crashes: A Practical Guide to Linux Quotas and edquota

June 11, 2026

Disk space exhaustion can crash a server in seconds. This guide shows you how to use Linux quotas and edquota to set hard and soft limits for users, keeping your shared systems stable.

Linux

Nix on Ubuntu and Debian: Multi-Version Software and Atomic Rollbacks

May 30, 2026

Ditch dependency conflicts on Ubuntu and Debian. Learn how to use the Nix Package Manager for side-by-side software versions, non-root installs, and instant rollbacks.