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

Readiness Probe Failure in Kubernetes Deployment

In a Kubernetes environment, a PostgreSQL deployment was experiencing issues with its readiness probe, leading to frequent failures. The readiness probe is a critical mechanism ...

Jan 02, 2025 · 2 min read

2 of 5 Kubernetes

Crunchy PGO 5.6.7 Kubernetes 29 Cluster Basic Documentation

This documentation provides step-by-step instructions for setting up a Kubernetes 29 cluster, installing necessary components such as Cilium, Rook Ceph storage, and Crunchy PGO,...

Jul 08, 2025 · 4 min read

3 of 5 PostgreSQL

Configuration Documentation for Potential Configuration Changes for Faster Availability

This document explains two specific configuration changes made to the Patroni Configuration and the PodDisruptionBudget (PDB) in the Kubernetes and PGO Crunchy setup. These sett...

Feb 10, 2025 · 4 min read

4 of 5 Kubernetes

Rook Ceph RBD PVC Troubleshooting Guide for Multi-Attach and MountDevice Failures

This guide provides a detailed, step-by-step process to resolve stuck Rook Ceph RBD volumes in Kubernetes, particularly when pods encounter errors such as:

Jul 08, 2025 · 8 min read

5 of 5 PostgreSQL

PostgreSQL High-Availability Cluster Deployment Guide

This comprehensive guide provides end-to-end instructions for deploying a resilient PostgreSQL cluster using the Crunchy Data PostgreSQL Operator on Kubernetes. The solution int...

Jul 08, 2025 · 7 min read

Writing

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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...

Jul 17, 2026

Setting Up Highly Available PostgreSQL Cluster with Patroni, etcd, HAProxy, and Keepalived

1. Overview 2. Architecture 3. Prerequisites 4. Initial Setup - Hostname Configuration - Package Installation

Jun 10, 2026

PostgreSQL 17 + Pgpool-II HA Cluster — Configuration Guide

A comprehensive step-by-step guide to deploying a highly available PostgreSQL 17 cluster with Pgpool-II 4.5, including streaming replicat...

Jul 29, 2025

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 (Extrac...

Jul 08, 2025

Setting Up Streaming Standby for PGO Crunchy PostgreSQL Cluster

- Introduction - Prerequisites - Step 1: Prepare TLS Certificates - Step 2: Create Kubernetes Secrets - Step 3: Configure Primary Cluster

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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