Linux Archives - Page 33 of 33 - ITFROMZERO

Virtualization tutorial - IT technology blog

Configuring Network Bridge and TAP Interface for KVM on Linux — Hands-On from the Homelab

By IT From Zero March 1, 2026

A guide to configuring a network bridge (br0) and TAP interface for KVM virtual machines on Linux — from concept to hands-on practice with Netplan and libvirt. VMs get a real IP on the LAN, connecting directly like a physical machine, no NAT involved.

Virtualization

How to Use Vagrant for a Consistent Dev Environment — No More ‘Works on My Machine’

By IT From Zero March 1, 2026

Vagrant standardizes dev environments with a Vagrantfile committed to git — putting an end to the 'works on my machine' problem. This article compares manual VMs, Docker, and Vagrant, analyzes when to use each, and provides a step-by-step setup guide from a single VM to a multi-machine production simulation.

Database

Optimizing PostgreSQL Performance with PgBouncer: Connection Pooling in Production

By IT From Zero February 28, 2026

A guide to installing and configuring PgBouncer to address connection overhead in PostgreSQL. Real-world experience after 6 months in production: server connections reduced from 180 to 25, API response time improved from 800ms to under 300ms.

Network

Setting Up a DNS Server with Bind9 on Ubuntu/Debian

By IT From Zero February 28, 2026

A step-by-step guide to setting up an internal DNS server with Bind9 on Ubuntu/Debian: installation, forward and reverse zone files, forwarder and ACL configuration, testing, and troubleshooting. Written from real-world experience managing an office network.

Database

Getting Started with Redis: Installation and Basic Usage — From 2 AM Production Crisis to Proficiency

By IT From Zero February 28, 2026

When a Django server starts timing out under heavy traffic, the culprit is often a database overwhelmed by repeated identical queries. This guide covers installing Redis on Linux, the essential commands you need to know, and how to integrate a cache layer into Python to immediately reduce database load.

Security

Detecting and Responding to a Hacked Server: A Practical Step-by-Step Guide

By IT From Zero February 28, 2026

A step-by-step guide to detecting and responding to a compromised Linux server: from manual command-line inspection and rootkit scanning with rkhunter/chkrootkit, to server isolation and setting up Fail2ban for long-term defense. Includes real commands and hands-on experience.

Security

Complete Guide to Installing and Configuring OpenVPN on Ubuntu Server from A to Z

By IT From Zero February 28, 2026

A complete guide to installing and configuring OpenVPN on Ubuntu Server, covering everything from CA creation and client certificate signing to split tunneling configuration and security hardening tips drawn from real-world server audits.

Linux

How to Use tmux: Managing Multiple Terminals and Keeping Sessions Alive When SSH Drops

By IT From Zero February 28, 2026

tmux is a terminal multiplexer that lets you manage multiple terminals within a single SSH window and keep sessions alive even after losing your connection. This guide covers installation, essential shortcuts, and practical workflows for developers working with Linux servers.