Jena.
Systems Engineer and Linux specialist. Deeply focused on infrastructure automation, terminal productivity, and performance tuning for high-availability systems.
All Articles by Jena
49
Limitations & SPA DOM Volatility in page-agent
Master reliability engineering in Alibaba's page-agent, handling Virtual DOM re-renders, state drift, Shadow DOM, and Canvas blindspots.
How to Fix Debian/Ubuntu Initramfs Boot: fsck & Rescue Steps
Stuck at an initramfs prompt or black screen? Follow safe, step-by-step fsck and rescue steps to fix Debian/Ubuntu boot failures.
Plants vs. Electronics: How to Manage Humidity Near High-End PC Setups
Too much humidity kills electronics. Here's the safe RH range for your components, which plants stay below it, and how to monitor your desk environment with a ₹600 sensor.
How to Fix a Frozen Linux System Without Losing Data
Safely revive a frozen Ubuntu, Pop!_OS, or Linux Mint system. Learn desktop restarts, TTY terminal commands, and Magic SysRq (REISUB) key sequences.
Self-Hosted AI Stack 2026: Ollama, Open WebUI, n8n & Qdrant Guide
Run a complete AI stack on your own hardware. Step-by-step guide to installing and connecting Ollama, Open WebUI, n8n, and Qdrant for a fully local AI platform.
PromQL Alerting Cheatsheet: Prometheus & Grafana
Write high-performance Prometheus monitoring rules: PromQL selectors, vector matching, rates, offsets, and alert configurations.
eBPF & Cilium Kubernetes Networking Cheatsheet: The Complete Reference
Master eBPF and Cilium CNI: secure Kubernetes networking, cross-cluster service routing, Hubble network visibility, and network policies.
AWS EKS Production Tuning Cheatsheet: The Complete Reference
Scale Kubernetes on AWS: EKS compute nodes (Karpenter), networking (VPC CNI), IAM Roles for Service Accounts (IRSA/EKS Pod Identities), and cost optimization.
AWS Transit Gateway & VPC Routing Cheatsheet: The Complete Reference
Architect scalable AWS networks: VPC Peering, Transit Gateway, VPC endpoints (PrivateLink), NAT Gateways, and centralized ingress/egress patterns.
Debugging Node.js OOM in Docker: V8 Heap Profiling Guide
A complete step-by-step guide to troubleshooting containerized Node.js memory leaks. Configure automatic V8 heap snapshot captures and connect securely to production containers.
mise Cheat Sheet: Unified Runtime & Tool Manager (2026)
Complete mise reference — install and switch Node, Python, Rust, Go versions, manage tools, activate via shell, Docker, and CI/CD with working commands.
FFmpeg Cheat Sheet: Convert, Compress & Edit Video
Task-first FFmpeg reference — convert formats, compress for web, trim clips, extract audio, create GIFs, and batch-process video with working commands.
macOS Security & Privacy Essentials: Protect Your Data and Stay Safe
Secure your Mac with FileVault encryption, firewall, privacy settings, and best practices. Learn to protect against malware, manage passwords, and understand Gatekeeper.
Advanced Hermes Agent: Optimization, Scaling & Learning Loop Tuning
Make your Hermes Agent production-grade. Optimize the learning loop, scale to thousands of users, and tune every parameter.
Hermes Agent Config Templates: 5 Copy-Paste Ready Setups
Ready-to-use Hermes Agent config files for personal, team, production, enterprise, and hybrid setups. Copy, paste, adjust one value, done.
Install Hermes Agent in 15 Minutes: Complete Setup Guide
One bash command and you're done. Here's the exact step-by-step installation for Hermes Agent on Linux, macOS, and Windows.
Run Hermes Agent with Ollama: Complete Local LLM Setup
Connect Hermes Agent to Ollama for free, private AI inference. Zero API costs, complete data privacy, fast local inference.
Advanced Ollama Optimization for Hermes Agent: Speed, Cost & Quality
Squeeze 3x performance from Ollama. Optimize model selection, GPU tuning, quantization, and caching for production Hermes deployments.
curl vs wcurl: When to Use the Wrapper vs Raw curl
Ubuntu replaced wget with wcurl—a curl wrapper. Learn when to use wcurl for simple downloads and when you still need raw curl for full control.
wget vs curl: When to Use Each (Complete Guide)
Learn the real differences between wget and curl. When to use wget for downloads and site mirroring, and when to reach for curl for APIs and HTTP debugging.
macOS Screenshot & Media Mastery: Capture, Edit, and Share Like a Pro
Master macOS screenshot tools, QuickTime video editing, text extraction from images, and annotation apps. The complete guide to visual content creation on Mac.
SSH Remote File Editing: Edit Files on Servers Like a Pro
Master remote file editing — SSH into servers, edit files with vi/nano/emacs, use local editors remotely, and handle common remote editing scenarios.
Terminal Text Editors Compared: vi/vim vs Nano vs Emacs
Choose the right terminal text editor — compare vi/vim, Nano, and Emacs by learning curve, power, use cases, and when to use each one.
Install and Configure Git on Ubuntu 26.04
Complete guide to install Git on Ubuntu 26.04. Configure user identity, generate SSH keys for GitHub/GitLab, master essential workflow commands, and customize with aliases.
Install .deb Packages on Ubuntu 26.04
Complete guide to install .deb packages on Ubuntu 26.04 using apt, dpkg, and GDebi. Handle dependencies, verify installations, and troubleshoot common errors.
Install and Configure PostgreSQL on Ubuntu 26.04
Complete guide to install PostgreSQL 18 on Ubuntu 26.04. Set up roles, databases, remote access, authentication methods, and security hardening.
Install and Secure MySQL on Ubuntu 26.04
Complete guide to install and harden MySQL on Ubuntu 26.04. Run mysql_secure_installation, create users and databases, configure remote access with firewall rules.
Set Up Samba File Sharing on Ubuntu 26.04
Complete guide to configure Samba file sharing on Ubuntu 26.04. Create public and private SMB shares, manage users, configure firewall, and access from Linux and Windows clients.
How to Exit Emacs: Save, Quit, and Force Close
Complete guide to exiting GNU Emacs — save changes, quit without saving, force quit, cancel operations, and handle common stuck scenarios.
Claude Code Routines: The 24/7 Digital Workforce That Never Sleeps
Anthropic just shattered the ceiling of AI automation. Claude Code Routines are here to run your workflows in the cloud—for engineers, marketers, and industrial leaders alike.
How to Install and Use nvm (Node Version Manager)
Install nvm on macOS, Linux, and WSL, manage multiple Node.js versions, set defaults, and use .nvmrc for per-project version pinning.
How to Set Up a Reverse Proxy with Nginx
Step-by-step guide to setting up Nginx as a reverse proxy for your web apps. Learn to configure HTTPS, security headers, WebSocket support, and rate limiting.
Zsh + Oh My Zsh: The Ultimate Terminal Setup Guide
Transform your terminal with Zsh and Oh My Zsh — themes, plugins, aliases, and productivity hacks. From boring bash to powerful command line.
SSH Config & Aliases: The Developer's Connection Kit
Master SSH configuration — host aliases, jump hosts, key management, port forwarding, and secure connections. Save time with ~/.ssh/config automation.
Automator & Shortcuts: Automate Repetitive Tasks on macOS
Create powerful automations with Automator and Shortcuts. Build folder actions, quick actions, and workflows that save hours of manual work.
Gemma 4 on Edge Devices: Android, Raspberry Pi, and IoT Applications
Deploy Gemma 4 on edge devices — Android phones, Raspberry Pi 5, NVIDIA Jetson, and IoT. Vision, audio, and agentic AI that runs completely offline.
How to Configure Office 365 SMTP Relay for Sending Email
Office 365 SMTP relay vs client submission — settings, connector setup, and code examples for sending email through Microsoft 365 in enterprise environments.
How to Harden SSH on a Linux Server
Step-by-step SSH hardening guide. Learn to disable root login, enforce SSH keys, change ports, and add 2FA to protect your Linux server from brute-force bots.
Keyboard Mastery on macOS: The Complete Guide to 10x Your Typing Speed
Master macOS keyboard shortcuts, create custom key combinations, set up a Hyper Key, and use text snippets to eliminate repetitive typing. A comprehensive guide for power users.
How to Use Brevo (Sendinblue) SMTP Server for Sending Email
Brevo SMTP settings, SMTP key generation, 300 free emails/day setup, and PHP, Python, and Node.js code examples — formerly known as Sendinblue in 2026.
How to Use Yahoo Mail SMTP Server for Sending Email
Yahoo Mail SMTP settings, App Password setup, and code examples for PHP, Python, and Node.js — configure any email client or app to send through Yahoo in 2026.
Reduce Disk Writes on Debian and Ubuntu Desktop
Five tweaks that cut unnecessary disk writes on Debian and Ubuntu — noatime, volatile journald, tmpfs, swappiness, and zram. Safe on SSDs and HDDs.
Unsigned Columns in Laravel Migrations
Master Laravel 12 migrations with unsigned columns. Learn foreignId(), unsignedBigInteger(), and best practices for foreign key constraints in modern PHP applications.
Handling Errors in Agent Skills: Retries and Fallbacks
What happens when a tool fails? Handle errors in agent skills — timeouts, bad API responses, retries, and graceful fallbacks with real Node.js code.
Multi-Agent Systems Explained: Scaling AI Beyond One Agent
Discover how multi-agent systems work. Learn about orchestrator patterns, subagents, and Claude Agent Teams to build scalable, specialized AI worker squads.
Control Auto-Suspend on Ubuntu 26.04
Complete guide to manage auto-suspend on Ubuntu 26.04. Configure power settings via GUI, gsettings, or systemd to optimize battery life and prevent unwanted sleep.
Find IP Address of Any Website Using Linux Commands
Learn Linux commands to find IP addresses of any website. Master dig, host, nslookup, and ping for DNS lookups and network troubleshooting on Ubuntu 26.04.
Delete Local Git Branch Using Terminal
Learn to delete local Git branches safely using terminal commands. Master git branch -d, -D flags, and cleanup workflows for maintaining a clean repository.
Reset HTML Forms Programmatically with JavaScript
Learn to reset HTML forms programmatically using JavaScript. Master the reset() method, form validation handling, and modern DOM manipulation techniques.