ITNotes - Page 3 of 119 - From Terminal to Cloud

Mastering /etc/fstab: How to Auto-mount Disks Without Breaking Your Boot

August 28, 2026

Avoid the dreaded Linux emergency mode. Learn how to safely configure /etc/fstab using UUIDs, handle NFS shares with 'nofail', and test your changes before rebooting.

Programming

Mastering Gleam: Build Fault-Tolerant Distributed Systems with Static Typing on the BEAM VM

August 27, 2026

Gleam is a statically typed functional language that compiles to BEAM bytecode, combining Erlang's legendary fault tolerance with compile-time type safety. This guide walks through setting up Gleam, building supervised actors, and leveraging OTP for self-healing distributed systems — with working code examples throughout.

Programming

Interactive Data Visualization on the Web with D3.js and TypeScript: Dynamic Charts, Heat Maps, and Dashboards

August 27, 2026

Build an interactive analytics dashboard with D3.js and TypeScript — animated line charts, heat maps with color scales, and a responsive layout. Includes working TypeScript code throughout, plus performance verification techniques from real production dashboards.

Networking

Installing and Configuring OpenNMS Horizon on Linux: Enterprise Network Monitoring with SNMP Auto-Discovery and Threshold Alerting

August 27, 2026

A six-month production review of OpenNMS Horizon on Ubuntu Linux, covering SNMP auto-discovery across 180+ network devices, threshold alerting with hysteresis, and performance collection setup. Includes complete installation steps and real configuration examples.

Security

Hardening etcd and Kubernetes API Server: Encryption at Rest, mTLS, and Credential Leak Detection

August 27, 2026

etcd stores every Kubernetes Secret and cluster state — by default, without encryption. This guide covers enabling encryption at rest, verifying mTLS between control plane components, and scanning for credential leaks to lock down the most critical layer of your cluster.

Networking

Setup L2TP/IPsec VPN on Linux: No-App Remote Access for iOS, Android, and Windows

August 27, 2026

Tired of managing VPN apps for non-tech users? Learn how to set up a native L2TP/IPsec VPN on Linux that works out-of-the-box on iOS, Android, and Windows.

HomeLab

Building a 4-Node Raspberry Pi K3s Cluster Under $150: A Hands-On DevOps Lab

August 27, 2026

Build a fully functional 4-node Raspberry Pi cluster using K3s and shared storage for under $150. Learn hardware selection, OS tuning, and NFS provisioning for persistent data.

Programming

Calling C Libraries from Python with ctypes and cffi: Speed Up CPU-Intensive Code Without Cython

August 26, 2026

When a Python data pipeline was timing out at 2 AM, the fix wasn't another algorithm tweak — it was calling a C function directly from Python using ctypes. This guide shows how to integrate C/C++ with Python via ctypes and cffi, call system libraries, and eliminate CPU bottlenecks without touching Cython or your build pipeline.

How to Install and Use LM Studio: Run Local AI Models with a Desktop GUI

August 26, 2026

LM Studio is a desktop app that lets you download, run, and manage large language models locally on Windows, macOS, and Linux — no Docker or terminal setup required. It includes a built-in OpenAI-compatible API server, so your existing code can switch from paid APIs to local inference with a single line change. This guide walks through installation, model setup, server configuration, and performance testing.

Linux

Mastering Linux Memory Overcommit: Configure vm.overcommit_memory for Database and AI Workloads in Production

August 26, 2026

Linux memory overcommit lets the kernel promise more RAM than physically exists — a gamble that ends badly for production databases and AI services when the OOM killer strikes at 2 AM. This guide covers how vm.overcommit_memory modes work, how to configure them correctly for PostgreSQL and ML workloads, and how to monitor commit usage before it becomes a crisis.

Speed Up Python with Numba JIT: Make Heavy Data Processing 100x Faster

CDK for Terraform (CDKTF) with Python: Deploy Cloud Resources Without Writing HCL

Clean Up Your Java Code: A Practical Guide to Vavr

Stop Deploying Broken Docker Images: A Guide to Container Structure Tests

Mastering Golang Memory Profiling: A Practical Guide with pprof

Stop Storing Secrets in Git: A Guide to 1Password Connect on Kubernetes

Building a Network Performance Testbed: High-Speed Testing with TRex on Linux

Stop Writing Boilerplate: A Guide to Python Dataclasses, Attrs, and Pydantic

Build Your Own Private 5G Network: A Hands-On Guide with Open5GS and srsRAN

Mastering Socket.IO in Node.js: Building Secure, Production-Ready Real-Time Apps

Mastering /etc/fstab: How to Auto-mount Disks Without Breaking Your Boot

Mastering Gleam: Build Fault-Tolerant Distributed Systems with Static Typing on the BEAM VM

Interactive Data Visualization on the Web with D3.js and TypeScript: Dynamic Charts, Heat Maps, and Dashboards

Installing and Configuring OpenNMS Horizon on Linux: Enterprise Network Monitoring with SNMP Auto-Discovery and Threshold Alerting

Hardening etcd and Kubernetes API Server: Encryption at Rest, mTLS, and Credential Leak Detection

Setup L2TP/IPsec VPN on Linux: No-App Remote Access for iOS, Android, and Windows

Building a 4-Node Raspberry Pi K3s Cluster Under $150: A Hands-On DevOps Lab

Calling C Libraries from Python with ctypes and cffi: Speed Up CPU-Intensive Code Without Cython

How to Install and Use LM Studio: Run Local AI Models with a Desktop GUI

Mastering Linux Memory Overcommit: Configure vm.overcommit_memory for Database and AI Workloads in Production