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Long-Term Network Bandwidth Monitoring with vnStat on Linux: Track, Analyze, and Export Usage Reports

June 3, 2026

vnStat is a lightweight Linux daemon that tracks network bandwidth over time — no packet capture, minimal overhead. This guide walks through installation, daemon setup, querying daily/monthly/yearly reports, and exporting data to JSON for scripts and alerts.

Linux

Debugging Linux Application Crashes with Core Dump and GDB: systemd-coredump Setup Guide

June 3, 2026

When a Linux application crashes in production, the difference between a 20-minute fix and a 3-hour investigation often comes down to whether you captured a core dump. This guide compares ulimit, systemd-coredump, and ABRT, then walks through configuring systemd-coredump and using GDB with coredumpctl for real post-crash analysis.

Linux

Mastering lsof: Find Which Process is Using Your Files and Ports

June 3, 2026

Master the lsof command on Linux to troubleshoot system issues by identifying which processes are using specific files, network ports, and sockets. Learn practical tips for production environments.

Linux

Stop Waiting: Mastering GNU Parallel to Maximize Your Linux CPU

June 3, 2026

Stop waiting for single-threaded Bash loops. Master GNU Parallel to run tasks across all your CPU cores simultaneously, reducing processing times from hours to minutes.

Database

Valkey: Install, Configure, and Migrate from Redis After the License Change

June 2, 2026

After Redis Ltd. changed its license to SSPL in 2024, our team migrated three environments to Valkey — the Linux Foundation-backed BSD fork. Six months in, here's the full guide: installation, configuration, and proven zero-downtime migration strategies from Redis to Valkey.

Linux

Linux SUID, SGID, and Sticky Bit: Master Special Permissions for System Security

June 2, 2026

SUID, SGID, and Sticky Bit are Linux's special permission bits that control privilege elevation and file ownership inheritance. Here's how each one works internally, when to actually use them in production, and how to audit your system before someone else finds the misconfigurations.

Linux

Linux CPU Pinning: How to Squeeze Every Drop of Performance from Your Hardware

June 1, 2026

Master Linux CPU resource management. Learn how to use taskset, numactl, and cpusets to eliminate context switching and optimize your high-performance applications.

Security

Deploying Security Onion: A Practical Guide to Network Security Monitoring (NSM)

June 1, 2026

Transform a spare server into a powerful threat-hunting machine. This guide shows you how to deploy Security Onion to gain deep visibility into your network traffic.

Linux

Mastering OverlayFS: A Practical Guide to Union Filesystems and Container Storage

May 31, 2026

Master Linux OverlayFS to merge read-only and writable layers. This technical guide provides hands-on examples for Docker optimization, persistent Live USBs, and troubleshooting XFS ftype issues.

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.