Setting Up a Buildbarn RBE Cluster for AOSP (Ubuntu 24.04, From Source)
Topology What you get TL;DR Build the five binaries with Bazelisk, create storage/worker file pools, drop the Jsonnet files under […]
Android & Mobile Development
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.
Identity, Security & PKI
Install phpLDAPadmin v2.3.5 on Ubuntu 24.04 (PHP 8.4 + Nginx)
Goal: native install of phpLDAPadmin v2 (2.3.5) under /opt/phpLDAPadmin, served by Nginx + PHP-FPM 8.4, connecting to LDAP/LDAPS. Node is
Networking & Connectivity
Speed up repeat downloads with an explicit Squid 7.1 proxy on Ubuntu 24.04
(Build from source • MITM with a dedicated Squid MITM Root CA (self-signed) • Broad caching • Run as proxy
Identity, Security & PKI
OpenDJ: Find the JVM’s Default Heap and Right-Size It for Tiny Directories
TL;DR: Use jcmd to see what heap Java chose by default. For a tiny directory (~10 entries), set -Xms128m -Xmx128m
Identity, Security & PKI
Upgrade OpenDJ 4.9.4 → 4.10.2 on Ubuntu 24.04
Scope: In-place upgrade of a single OpenDJ node installed via the official .deb. No topology or port changes. Prerequisite: You
Observability & Operations
Monitor AWS with Zabbix 7.4 (AWS by HTTP): CloudShell-only IAM, Host Wizard, and Cost Explorer
Zabbix 7.4 includes AWS by HTTP templates. You create a single account host (e.g., aws-prod) and link only the base
Observability & Operations
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
Convert “FreeBSD by Zabbix agent” to Active (Zabbix 7.4)
TL;DR Clone FreeBSD by Zabbix agent → mass-update all Zabbix agent items to Zabbix agent (active) → switch agent-based discovery
Cloud, Linux & Virtualization
Ceph RGW multisite UI: A Geo-Distributed File Browser for Your Object Storage
TL;DR: A file-browser style UI for Ceph RGW multisite that lets you browse, preview, and fetch objects across zones as
Networking & Connectivity
Custom DDNS for Your Home Lab with OPNsense BIND (Python + cron)
TL;DR: This guide shows a small Python script that discovers your public IPv4, updates an A record in the OPNsense