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 […]
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.
AI & Desktop Tools
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.
AI & Desktop Tools
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
DevOps & Software Delivery
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
Data Platforms & Analytics
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
Data Platforms & Analytics
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 you’ll
Data Platforms & Analytics
Upgrade Apache Spark 3.5.6 → 4.0 on Ubuntu 24.04 (Single Node, Classic Mode)
Goal: Install Spark 4.0.0 (Hadoop 3, Connect build) at /opt/spark, but keep Classic mode for now by setting SPARK_CONNECT_MODE=0.We’ll remove
Observability & Operations
Zabbix 7.4 + Keycloak (SAML 2.0): End-to-End Setup with JIT Provisioning
This guide connects Zabbix 7.4 at https://zabbix.maksonlee.com to Keycloak at https://keycloak.maksonlee.com (realm maksonlee.com) using SAML 2.0, and enables Just-in-Time (JIT)
Observability & Operations
Monitor a Linux Host with Zabbix 7.4 (Ubuntu 24.04)
What you’ll do: add a Linux machine to Zabbix using the standard agent so you get CPU, memory, disk, filesystem,
Data Platforms & Analytics
Install MariaDB 11.4 on Ubuntu 24.04
Summary: Ubuntu 24.04’s repo installs MariaDB 10.11.x. This guide adds MariaDB’s official APT repo to install MariaDB 11.4, secures the