personal technical knowledge base
A working collection of practical notes, commands, troubleshooting steps, configuration references, and lessons from systems work, homelab projects, and hands-on learning.
Most notes start as working material. They are kept here so a useful fix, decision, or reference can be found again, reused, and improved over time.
chronological index
Designed and verified a pull-based backup replication path from a VPS-hosted stateful service to an OpenWrt Raspberry Pi with dedicated external storage, separating fast recovery points from an independently retained local archive.
Field notes from troubleshooting and recovering router firmware/storage failures, including EdgeRouter X serial console recovery, NAND/MTD corruption symptoms, bootloader access, and external flash recovery direction.
Field notes from troubleshooting ARM-based VPS hosting for dedicated services, covering instance availability, boot issues, Docker architecture mismatches, runtime problems, and recovery checks.
Field notes from building a server-side extension that protects shared areas from unauthorized changes while preserving permitted user actions.
Field notes from deploying and maintaining an extension-enabled stateful service on Linux, including service management, extension compatibility, ports, console access, updates, backups, and relay planning.
Field notes from hosting and operating an extension-enabled stateful service on Linux, including ARM compatibility, service launch, extension handling, configuration, logs, and troubleshooting.
Field notes from hosting a dedicated service at home behind an isolated VLAN, using an OpenWrt router, managed-switch tagging, and a Proxmox server.
Field notes from building a server-side relay that connects live service events and application messaging with an external communication platform.
Field notes from running AdGuard Home on OpenWrt, including DNS ownership, port 53 conflicts, resolver failures, and practical troubleshooting.
Field notes from creating small deployment helper scripts for Docker-based services so build, run, restart, logs, cleanup, and updates are repeatable.
Field notes from building a practical OpenWrt-based home network with custom routing, DNS filtering, VPN access, VLAN direction, and service troubleshooting.
Field notes from expanding OpenWrt storage on a Raspberry Pi so the router can safely support extra packages, logs, and small services without running into overlay space limits.
Field notes from deploying small services to OpenWrt when rsync is unreliable, using SCP, tar over SSH, Git pull, and simple deployment scripts instead.
Field notes from deploying and maintaining a lightweight messaging automation service on an OpenWrt device, including Node.js, environment files, Docker/procd service direction, logs, restarts, and update workflow.
Field notes from designing migration tooling for moving business data from Dolibarr into Odoo while keeping product, customer, quotation, invoice, and stock data understandable and verifiable.
Field notes from running local Qwen LLM models on a desktop GPU and connecting them to an agent workflow for self-hosted infrastructure, network, and system administration tasks.
Field notes explaining how CGNAT affects self-managed infrastructure, port forwarding, public IP scans, shared addresses, and practical alternatives for exposing private services.
Field notes from comparing Raspberry Pi and Banana Pi options for OpenWrt routing, VLAN-based networks, VPN access, self-hosted infrastructure separation, and small infrastructure deployments.
Field notes from setting up DuckDNS on OpenWrt for dynamic DNS, remote access, WireGuard endpoints, and self-managed infrastructure workflows.
Field notes from setting up WireGuard remote access for a home/lab network, including peer configuration, firewall rules, QR setup, and external testing.
Field notes from building an AirBnB-style property listing application, focused on backend models, database relationships, API structure, frontend rendering, and deployment fundamentals.
Field notes from building a browser-based grid interaction system focused on data modeling, movement rules, collision handling, rendering, state management, and algorithmic thinking.
Field notes explaining what open ports reveal, how service fingerprinting works, what attackers can infer from SSH/HTTP/HTTPS exposure, and how to reduce unnecessary public information leakage.
Field notes from building a small Unix-like shell in C to understand process creation, command parsing, PATH lookup, environment handling, and low-level Linux behavior.
Field notes from rebuilding a minimal printf-style function in C to understand variadic arguments, format parsing, character output, conversion handling, and low-level edge cases.