Install JupyterLab on Ubuntu 24.04
Running JupyterLab as a headless server on Ubuntu is perfect for data science, education, or research. In this guide, we’ll […]
Data Platforms & Analytics
Engineering field notes
Practical DevOps, Infrastructure, and Platform Engineering Notes
Tested walkthroughs from real lab and production-style setups across Linux, cloud, Kubernetes, networking, security, observability, data platforms, IoT, Android, and self-hosted services.
Data Platforms & Analytics
Sync ThingsBoard Time-Series Data from Cassandra to Delta Lake Using Spark SQL
This guide shows how to mirror time-series data stored in ThingsBoard’s Cassandra database into a Delta Lake table using spark-sql.
Data Platforms & Analytics
Deploy Apache Spark 3.5.6 on a Single-Node Bare Metal Ubuntu 24.04 Server
This guide walks you through deploying Apache Spark 3.5.6 on a single-node Ubuntu 24.04 bare metal server using standalone mode.
IoT & Embedded Systems
ESP32 Firmware for BLE Wi-Fi Provisioning and Secure MQTT with X.509 Authentication to ThingsBoard
In a previous post, I explained how to secure ThingsBoard using X.509 client certificate authentication and enable auto-provisioning.This post focuses
Identity, Security & PKI
Deploying Step CA: Your Own Certificate Authority for Internal Services
Smallstep step-ca is a CA server for automated certificate issuance in internal environments (homelabs, labs, DevOps workflows). The common model
IoT & Embedded Systems
IoT Device Lifecycle: ESP32 + BLE Provisioning + ThingsBoard Auto-Provisioning
This post outlines the full lifecycle of an IoT device, from factory assembly to end-user operation, and ownership transfer. Devices
Identity, Security & PKI
Secure ThingsBoard MQTTS with X.509 Certificate Chain and Auto-Provisioning
This guide builds on: to enable: Why We Removed MQTTS from HAProxy In the earlier setup, HAProxy terminated TLS for
IoT & Embedded Systems
Provision ESP32 Wi-Fi via BLE
Provisioning Wi-Fi credentials to an ESP32 can be tricky without a screen or keyboard. Thankfully, Espressif provides a simple way
IoT & Embedded Systems
ESP32-WROOM-32 Quick Start Guide on Windows
This guide walks you through building and flashing your first ESP32 project using the ESP-WROOM-32 DevKit and the official ESP-IDF
IoT & Embedded Systems
Secure Bare-Metal ThingsBoard with HAProxy and Let’s Encrypt
This guide applies to bare-metal setups only. If you’re running ThingsBoard on Kubernetes, refer to your ingress controller (e.g. Traefik