Blog | Rejaka Abimanyu Susanto

Blog

2026

Using GitHub as Shared Storage for Obsidian Across Devices

Obsidian Sync isn't the only way to keep a vault available everywhere. Here is how to use a private GitHub repository as shared storage for an Obsidian vault across desktop and mobile, using the Obsidian Git plugin.
Automating Network and Server Configuration with Ansible

Manually configuring routers and servers one by one does not scale. Here is how Ansible automates both — from pushing IP configuration to a MikroTik router to deploying NGINX across multiple Linux servers with one playbook.
n8n JSON Template for Hydroponic Monitoring and Control System

n8n JSON template for hydroponic monitoring and control system
System Prompt for n8n Hydroponic AI Agent (Indonesia)

System prompt for n8n Hydroponic AI Agent
Smart Hydroponic: IoT-Based Monitoring and Control System

Manual hydroponic checks get skipped the moment you leave the house. Here is how an ESP8266, a pair of sensors, MQTT, n8n, and a Gemini-powered Telegram bot replace that with 24/7 automated monitoring and pump control.
MikroTik Firewall Filter Rules: Allow, Drop, and Access Control

NAT gets your clients online. Firewall controls what they can actually do once they are there. Here is a full two-router lab walkthrough covering static routing, NAT, and firewall filter rules with real test results.
MikroTik QoS with Simple Queue: Bandwidth Control That Actually Works

Without QoS, whoever sends the most traffic wins. Here is how Simple Queue on MikroTik lets you cap bandwidth per client or per subnet, scope limits to specific destinations, and keep one device from starving everyone else.
NAT on MikroTik Explained: Source NAT, Destination NAT, and Masquerade

Your laptop has a private IP that the internet has never heard of. NAT is the reason you can still browse freely. Here is how srcnat, dstnat, and masquerade work, with a real MikroTik lab walkthrough.
IP Addressing and Subnetting: A Beginner's Guide That Actually Makes Sense

Every device on a network needs an address. Here is how IP addresses actually work, how subnet masks divide a network, and how to calculate host ranges and subnet blocks without the confusion.
Mail Server Explained: How Email Actually Works Behind the Scenes

You hit send and the email arrives in seconds. Behind that simplicity is a chain of servers, protocols, and DNS lookups most people never see. Here's how it all actually works.

2025