Greetings — I'm

Moin Uddin Ahmed

A curious tinkerer who builds and runs reliable infrastructure

Welcome to my corner of the internet. I write about infrastructure, operations, and the lessons learned from running large-scale systems in production. You will also find some personal projects and experiments here, as well as a few thoughts on life and work.

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1 of 5 PostgreSQL

Using S3 for Backups in Postgres Operator

To set up backups in S3 for your PostgreSQL cluster, you need to make a few modifications to your custom resource (CR) spec. Additionally, you will need to either:

Jan 02, 2025 · 5 min read

2 of 5 Database

Backup Schedule Template in PGO Crunchy PostgreSQL Operator — Detailed Guide

Detailed guide explaining the rationale behind each step of managing and scheduling pgBackRest backups for a PostgreSQL PGO Crunchy cluster. Replace placeholders as needed.

Jan 02, 2025 · 5 min read

3 of 5 Windows

Reviving a "Dead" (Bricked) Lumia Using Windows Device Recovery Tool's Emergency/Thor2 Mode

A comprehensive guide for recovering a bricked Lumia via the Windows Device Recovery Tool's hidden thor2.exe emergency-flash mode, with corrections and additions from the defini...

Aug 29, 2017 · 10 min read

4 of 5 Data Engineering

ETL Server Setup to transfer data from Production to a Example. Data Warehouse Guide: Apache Airflow & PipelineWise

This guide provides clear, step-by-step instructions for setting up Apache Airflow and PipelineWise to manage and orchestrate ETL (Extract, Transform, Load) pipelines. It is des...

Jul 29, 2025 · 6 min read

5 of 5 PostgreSQL

Explanation Document: Pod Anti-Affinity Configuration for PostgreSQL Cluster

This document explains the pod anti-affinity configuration used in the PostgresCluster resource to ensure that the master and replica pods are scheduled on different nodes. It a...

Jan 28, 2025 · 3 min read

Writing

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Aug 25, 2026

PostgreSQL High Availability with Patroni + pgpool-II — A Complete Guide

A complete, decision-ready guide to a production 3-node PostgreSQL 16 HA cluster — Patroni owns the data plane, pgpool-II owns the access...

Aug 12, 2026

Testing High Availability PostgreSQL: From Manual Failover to Patroni + etcd + pgpool-II — A Journey of Real Faults, Honest Gaps, and Three Bugs We Didn't Expect

An honest engineering journey testing Patroni + etcd + pgpool-II against the exact fears that kept production on manual failover — false ...

Jul 21, 2026

Crunchy Data PostgreSQL Operator (PGO) — Production Operations Guide

A comprehensive production operations guide for Crunchy Data's PostgreSQL Operator (PGO) on Kubernetes. Covers deploying PostgresCluster ...

Jul 21, 2026

PGO Hands-On Demo & Operations Playbook

Jul 18, 2026

A Secure Kubernetes Multi-Master Cluster Setup Guide

A comprehensive, secure, step-by-step manual guide for setting up a production-grade multi-master Kubernetes cluster. Covers architecture...

A bit about me

DevOps Engineer based in Dhaka, Bangladesh, with experience in the fintech and telecommunications industries. I specialize in building reliable infrastructure, automating workflows, improving system reliability, and troubleshooting production incidents. Passionate about learning new technologies and sharing knowledge, I enjoy solving complex problems, optimizing operations, and delivering scalable, efficient solutions in collaborative environments.

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