Custom DDNS for Your Home Lab with Cloudflare (Python + cron)
Goal: keep a hostname (e.g., home.maksonlee.com) always pointing to your current WAN IP by calling Cloudflare’s API on a schedule. […]
Cloudflare
Apache Cassandra, Apache Spark, Debezium, Kafka
Global Reset: Cassandra CDC → Debezium → Kafka (SASL/SSL via HAProxy) → Spark → Delta Lake
Scope: wipe & rebuild the full ThingsBoard data pathKeyspace: thingsboard (drop + recreate)Kafka topics: tb.thingsboard.ts_kv_cf, tb.thingsboard.ts_kv_partitions_cf (auto-create enabled)Delta root: /delta
Certificates
Root CA, Intermediate CA, Server Certificates, and Private Keys Explained
When setting up TLS for your own services, or working with certificates from a commercial Certificate Authority, you will encounter
Debezium
Fixing Huge /var/log/syslog Caused by Debezium Cassandra Connector
When I followed my earlier guide End-to-End Stream: Cassandra 5.0.5 CDC → Kafka 4.0 (SASL/SSL) → Spark 3.5.6 → Delta
Apache Cassandra
Set Cassandra 5.0 JVM Memory Limits on Ubuntu 24.04 (Java 17)
Goal: make Cassandra’s memory use predictable by pinning the JVM heap and (optionally) capping off-heap/direct memory. This guide targets Ubuntu
Kiwi TCMS, Visual Studio Code
Remote Development on Ubuntu via VS Code Remote-SSH (Windows)
This article complements: Develop on a headless Ubuntu 24.04 server from Windows 10/11 using VS Code Remote-SSH, no desktop required.
IntelliJ IDEA, Kiwi TCMS
Develop Kiwi TCMS Remotely on Ubuntu 24.04 (Headless) with IntelliJ IDEA Ultimate + JetBrains Gateway (Windows 11)
Goal: Use IntelliJ IDEA Ultimate on Windows 11 to edit and run Kiwi TCMS on a GUI-less Ubuntu 24.04 server
Kiwi TCMS
Spin Up a Kiwi TCMS Dev Environment on Ubuntu 24.04 Server (Headless) and Access It via SSH Port Forwarding
Goal: Build Kiwi TCMS from source on a GUI-less Ubuntu 24.04 Server and run it in development mode (Django runserver
Apache Cassandra, Apache Spark, Debezium, ThingsBoard
When Delta Has More Rows Than Cassandra: ThingsBoard + Cassandra CDC → Debezium → Kafka → Spark → Delta Lake (TTL Gotcha)
Goal of this postDocument the exact debugging path we followed when our Delta table started showing more rows than Cassandra—step
Apache Spark
Enable Spark Connect (systemd) + Set Hive Catalog on Spark 4.0
This post is a follow-up to: Upgrade Apache Spark 3.5.6 → 4.0 on Ubuntu 24.04 (Single Node, Classic Mode) What