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Installing Ubuntu Server on Raspberry Pi 5: Headless Setup, Static IP, and Real-World Home Server

By admin July 2, 2026

A guide to installing Ubuntu Server 24.04 LTS on a Raspberry Pi 5 in headless mode — no monitor required — configuring a static IP with Netplan, and deploying lightweight services like Pi-hole, Uptime Kuma, and Vaultwarden for an energy-efficient home server.

MySQL

Configuring MySQL Active-Active Replication: Bidirectional Data Sync and Concurrent Write Conflict Handling

By admin July 2, 2026

A step-by-step guide to configuring MySQL Active-Active (Master-Master) Replication — from setting up binlog users and configuring auto_increment to prevent ID collisions, to handling write conflicts and practical routing tips from a 50GB production database.

Network

XDP Linux: Building an Ultra-Fast Packet Filter at the Driver Layer to Block DDoS

By admin July 2, 2026

XDP (eXpress Data Path) processes and filters packets directly at the NIC driver layer — before they enter the kernel stack — making it 10 to 100 times faster than iptables. This guide covers everything from writing an eBPF program in C, compiling and loading it into the kernel, to managing a real-time IP blocklist with BPF Maps and Python.

Development

Mastering Error Handling in Go: Wrap Error, Custom Error, and Best Practices for Real-World Projects

By admin July 2, 2026

Go handles errors via return values instead of exceptions — syntactically simple but demanding a clear strategy. This article compares three approaches: errors.New, Custom Error Type, and Wrap Error with %w, analyzing the trade-offs of each and walking through a layered architecture implementation for real-world projects.

VMware

VMware Fusion on Apple Silicon M1/M2/M3: Free Installation and Running Linux/Windows ARM

By admin July 2, 2026

VMware Fusion Pro has been free for personal use since late 2023 and fully supports Apple Silicon M1/M2/M3. This guide covers installation, running Ubuntu ARM and Windows 11 ARM at ~90% native performance — replacing Parallels Desktop and saving $100/year.

Database

PostgreSQL Anonymizer: The Ultimate Trick to Mask Production Data for Staging Without PII Leaks

By admin July 2, 2026

No more worrying about PII leaks during Production dumps. A detailed guide on using PostgreSQL Anonymizer to automatically anonymize emails and phone numbers for Staging/Dev.

Git

Mastering git format-patch and git am: A Professional Email-Based Code Submission Workflow

By admin July 2, 2026

Forget Pull Requests; this is how Linux Kernel experts share code. Learn the professional workflow of using git format-patch and git am to send patches via email.

Monitoring

PHP-FPM Performance Monitoring with Prometheus: Tracking Active Processes, Idle Workers, and Slow Requests to Optimize Your Web Server

By admin July 1, 2026

A guide to setting up PHP-FPM monitoring with Prometheus: enable the status page, install php-fpm_exporter, configure scraping, and build a Grafana dashboard to track active processes, idle workers, and slow requests. Detect bottlenecks before users ever feel them.

Centos

Configuring Automatic Security Updates on CentOS Stream 9 with dnf-automatic: Auto-Patch Vulnerabilities and Get Email Notifications

By admin July 1, 2026

A guide to installing and configuring dnf-automatic on CentOS Stream 9 to automatically apply daily security updates. Includes email notification setup via Postfix and practical tips from real-world server management experience.

VMware

Configuring vSphere Alarms and Email Notifications: Automated SysAdmin Alerts When ESXi CPU, RAM, and Datastore Exceed Thresholds

By admin July 1, 2026

A comparison of three ESXi monitoring approaches (native alarms, Zabbix, PowerCLI) and a practical walkthrough for deploying vSphere Alarms to automatically email SysAdmins when CPU, RAM, or Datastore usage hits dangerous thresholds. Step-by-step from SMTP configuration to fine-tuning thresholds to avoid alert fatigue.