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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.

Linux

Stop Hardcoding SMTP: Set Up a Postfix Mail Relay for Linux Alerts

May 25, 2026

Learn how to configure Postfix as a send-only mail relay on Linux. This guide covers installation, security hardening, and address rewriting to ensure your system alerts and Cron jobs deliver emails reliably.

Networking

Ubuntu Dual WAN Load Balancing and Failover with IPRoute2 and Netplan

May 21, 2026

Learn how to configure Dual WAN Load Balancing and Failover on Ubuntu Server using IPRoute2 and Netplan. This guide covers policy-based routing and automated health checks for high-availability networking.

Linux

Ditch the Mouse: A Practical Guide to i3wm on Ubuntu

May 21, 2026

Tired of overlapping windows? This guide shows you how to install i3wm on Ubuntu, configure Vim-style shortcuts, and slash your RAM usage for a faster workflow.