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Goodbye Patching Stress: Mastering vSphere Lifecycle Manager (vLCM) in Practice

By IT From Zero April 21, 2026

Forget risky manual ESXi updates. Discover how to use vSphere Lifecycle Manager (vLCM) to automate patching and ensure consistent driver and firmware management across VMware Clusters.

Database

Is Your PostgreSQL Disk Bloating? Pro Tips to Fix Bloat and Optimize Autovacuum

By IT From Zero April 21, 2026

PostgreSQL disk full due to Database Bloat? Learn how to optimize Autovacuum, use pg_repack, and REINDEX CONCURRENTLY to free up space without downtime.

Centos

OpenSCAP: The Automation ‘Weapon’ for PCI-DSS Security Audits on CentOS for DevOps

By IT From Zero April 21, 2026

Don't let security audits become a nightmare. Discover how to use OpenSCAP to automate vulnerability scanning and PCI-DSS compliance on CentOS/RHEL based on real-world DevOps experience.

Network

Mastering Policy-Based Routing (PBR) on Linux: Route Traffic Like a Pro

By IT From Zero April 20, 2026

Don't let backup traffic clog your main connection. A detailed guide on using Policy-Based Routing (PBR) on Linux to intelligently route traffic based on source IP and Port.

Ubuntu

i3wm on Ubuntu: Transform Your Laptop into the Ultimate Coding Machine for Developers

By IT From Zero April 20, 2026

A detailed guide on installing and configuring i3wm on Ubuntu for developers. This article shares practical tips to optimize your workspace, boost coding efficiency, and save system resources.

Artificial Intelligence tutorial - IT technology blog

Claude Agent SDK: Building Production-Ready AI Agents with Python/TypeScript

By IT From Zero April 20, 2026

Master the Claude Agent SDK to build professional AI agents. Real-world insights on optimizing latency, slashing costs by 90% with Prompt Caching, and handling production errors.

Monitoring

smartmontools Guide: Diagnosing Linux Hard Drive Issues Before Your Data Vanishes

By IT From Zero April 20, 2026

Don't let your hard drive die in silence. A detailed guide on using smartmontools to diagnose HDD/SSD health on Linux and setting up automated Telegram alerts.

Security

Securing SSH with Hardware Security Keys (FIDO2/Yubikey): When Private Keys Are No Longer a ‘Fatal Weakness’

By IT From Zero April 20, 2026

Hardening server security with Hardware Security Keys (Yubikey/FIDO2). A detailed guide on setup, using Resident Keys, and configuring servers to prevent private key leaks.

Database

Mastering MongoDB Aggregation Framework: Building Real-World Data Pipelines

By IT From Zero April 20, 2026

Learn to build optimized MongoDB Aggregation Pipelines through real-world examples. Explore $match, $group, $lookup, and how to handle the 100MB RAM limit for Big Data.

Security

Auditd Configuration Guide: The “Black Box” for Tracking Every Change on Linux

By IT From Zero April 20, 2026

Hackers can wipe history but they can't hide from Auditd. A guide to configuring the Linux "black box" to trace file edits, command execution, and overall server security.

Optimizing Redis RAM with HyperLogLog and Bloom Filter: Counting and Deduplicating at Scale

Building an Event-Driven Microservices System with Apache Kafka and NestJS: From Producer and Consumer to Dead Letter Queue (DLQ)

Installing and Configuring Rootless Docker: Run Docker Without Root to Protect Your Host

Configuring a PPPoE Server on Linux Using rp-pppoe for ISP Labs

A Guide to DiskCache in Python: Safe Multi-Process Disk Caching Without Redis

How to Configure Host sFlow on Linux: Real-Time Network Traffic and KVM Monitoring

Diagnosing and Resolving Deadlocks in PostgreSQL: Inspecting Lock Trees and Configuring Proper Timeouts

ESXi Host Configuration Backup and Restore with PowerCLI and ESXCLI: Saving Your Virtualization Cluster During Outages

Guide to VFIO PCIe Passthrough on Linux KVM: GPU Passthrough for Windows VMs

Integrating OpenTelemetry into Python: Practical Microservices Monitoring Strategies

Goodbye Patching Stress: Mastering vSphere Lifecycle Manager (vLCM) in Practice

Is Your PostgreSQL Disk Bloating? Pro Tips to Fix Bloat and Optimize Autovacuum

OpenSCAP: The Automation ‘Weapon’ for PCI-DSS Security Audits on CentOS for DevOps

Mastering Policy-Based Routing (PBR) on Linux: Route Traffic Like a Pro

i3wm on Ubuntu: Transform Your Laptop into the Ultimate Coding Machine for Developers

Claude Agent SDK: Building Production-Ready AI Agents with Python/TypeScript

smartmontools Guide: Diagnosing Linux Hard Drive Issues Before Your Data Vanishes

Securing SSH with Hardware Security Keys (FIDO2/Yubikey): When Private Keys Are No Longer a ‘Fatal Weakness’

Mastering MongoDB Aggregation Framework: Building Real-World Data Pipelines

Auditd Configuration Guide: The “Black Box” for Tracking Every Change on Linux