Monitor OPNsense with Zabbix (Active Agent, GUI-only)
TL;DR Install the OPNsense Zabbix Agent plugin → enable it → set Hostname to exactly your Zabbix host name →
Observability & Operations
Installation & Deployment
Cloud, Linux & Virtualization
Build ccache 4.11.3 from Source on Ubuntu 24.04
Goal: Compile and install ccache v4.11.3 from source on Ubuntu 24.04, with manpages. Includes expected install output, sanity checks, and
Cloud, Linux & Virtualization
Install the Latest Ansible on Ubuntu 24.04 with apt, Bootstrap Remotes, and Run a Minimal Project
Scope: apt-install Ansible, create an ansible user on the controller, provision remotes, and run a small project. 1. Install Ansible
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)
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
Cloud, Linux & Virtualization
Install Python 3.11 on Ubuntu 24.04 (Keep System 3.12) with pyenv
Need Python 3.11 on Ubuntu 24.04 (which ships 3.12)? Use pyenv to install 3.11 side-by-side without touching /usr/bin/python3. At a
Data Platforms & Analytics
How to Install Kafbat UI for Kafka 4.0 with SASL/PLAIN and HAProxy SSL Termination
In this post, we’ll set up Kafbat UI, a modern web-based Kafka management interface, to work with a secure Kafka
Data Platforms & Analytics
How to Enable Username/Password Authentication (SASL/PLAIN) in Kafka 4.0 with HAProxy SSL Termination
In the previous post, How to Install Kafka 4.0 on a Single Ubuntu 24.04 Node with HAProxy SSL Termination, we
Data Platforms & Analytics
How to Install Kafka 4.0 on a Single Ubuntu 24.04 Node with HAProxy SSL Termination
Introduction Apache Kafka 4.0 introduces KRaft mode (ZooKeeper-free) as the default. In this guide, we’ll install Kafka 4.0 on a