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Linux Bandwidth Monitoring: Identify Network-Hogging Processes with Nethogs and Iftop

By IT From Zero June 25, 2026

Master Nethogs and Iftop to analyze bandwidth by PID and IP. This article shares real-world scenarios for troubleshooting midnight server network congestion.

Docker

Dockerizing Django REST Framework: From ‘Bulky’ Images to Lean Production Builds

By IT From Zero June 25, 2026

Learn how to optimize Docker for Django REST Framework for production: reduce image size, configure multi-stage builds, and efficiently manage Celery/Redis stacks.

Linux

Automated Temporary File Management with systemd-tmpfiles: Don’t Let Your Server Die from Junk

By IT From Zero June 25, 2026

Avoid server downtime due to full disks. Learn how to use systemd-tmpfiles to automatically clean up temporary files and manage Linux system directories professionally and safely.

Git

Mastering git restore and git switch: The Modern Git Replacements for git checkout

By IT From Zero June 24, 2026

git switch and git restore split git checkout into two separate commands — each doing exactly one thing. Since Git 2.23, the workflow is clearer, less error-prone, and especially beneficial for team collaboration.

Security

Gophish: Build Your Own Phishing Simulation System for Internal Security Testing and Training on Linux

By IT From Zero June 24, 2026

Gophish is an open-source tool that lets you run internal phishing simulations without paying for an expensive external service. This guide covers installation, end-to-end campaign configuration, and how to analyze results to genuinely improve your team's security awareness.

Network

Configuring Traffic Mirroring on Linux with tc-mirred: Copy Packets to IDS/IPS Without Disrupting Service

By IT From Zero June 24, 2026

Traffic Mirroring with tc-mirred lets you copy all packets to a passive IDS/IPS device without disrupting production traffic. This guide walks through configuring both ingress and egress mirroring step by step, along with tips for selective traffic filtering and automating the setup with a systemd service.

Virtualization

Installing and Configuring Xen Hypervisor on Debian/Ubuntu: Type-1 Virtualization with XL Toolstack and Dom0

By IT From Zero June 24, 2026

A guide to installing Xen Hypervisor on Debian/Ubuntu, configuring Dom0, limiting RAM allocation, and creating DomU virtual machines with the XL toolstack. Covers PVH mode, network bridging, LVM snapshots, and everyday management commands.

MySQL

Mastering Foreign Keys in MySQL: Don’t Let Your Database Become a Data Junkyard

By IT From Zero June 24, 2026

Stop your database from becoming a junkyard. This guide covers MySQL Foreign Keys, ON DELETE CASCADE, and performance optimization tips for tables exceeding 50 million records.

Git

Upgrade Git Diff with Delta: Side-by-Side View and Beautiful Highlighting

By IT From Zero June 24, 2026

Tired of the default Git diff interface? Upgrade to Delta for side-by-side code viewing, syntax highlighting, and a professional interface right in your Terminal.

Database

pg_cron: Schedule Automated Jobs Inside PostgreSQL Without System Cron

By IT From Zero June 23, 2026

pg_cron is an extension that lets you schedule recurring jobs directly inside PostgreSQL without needing system cron or pgAgent. This article walks through installation, creating jobs for log cleanup and materialized view refreshes, and practical tips for managing jobs effectively.

Configuring BFD with FRRouting on Linux: Sub-Second Link Failure Detection for OSPF and BGP

Clean Up Stale Remote-Tracking Branches with git remote prune and git fetch –prune

Implementing Single Sign-On (SSO) with Keycloak and Next.js: A Complete OpenID Connect (OIDC) Guide

Enable MySQL Slow Query Log and Use pt-query-digest to Find Database Bottlenecks

MetaGPT with Python Guide: Automate Software Development with Multi-Agent Systems

Configuring SR-IOV on KVM/Proxmox: Share 10GbE NICs with Near Bare-Metal Performance

Docker Autoheal Guide: Automatically Restart Unhealthy Containers

APScheduler in Python: Production-Ready Background Job Scheduling for Backend

How to Reclaim Storage Space (Space Reclamation / UNMAP) on VMware ESXi

How to Use Bitnami Sealed Secrets on Kubernetes: Secure GitOps Secrets Management

Linux Bandwidth Monitoring: Identify Network-Hogging Processes with Nethogs and Iftop

Dockerizing Django REST Framework: From ‘Bulky’ Images to Lean Production Builds

Automated Temporary File Management with systemd-tmpfiles: Don’t Let Your Server Die from Junk

Mastering git restore and git switch: The Modern Git Replacements for git checkout

Configuring Traffic Mirroring on Linux with tc-mirred: Copy Packets to IDS/IPS Without Disrupting Service

Installing and Configuring Xen Hypervisor on Debian/Ubuntu: Type-1 Virtualization with XL Toolstack and Dom0

Mastering Foreign Keys in MySQL: Don’t Let Your Database Become a Data Junkyard

Upgrade Git Diff with Delta: Side-by-Side View and Beautiful Highlighting

pg_cron: Schedule Automated Jobs Inside PostgreSQL Without System Cron