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Sejoon Kim - Visual Studio Code

My Articles

Technical insights and tutorials about DevOps, Kubernetes, AWS, and infrastructure automation practices.

17.09.2025

Kubernetes StatefulSet: A Deep Dive

Understanding StatefulSet internals, ordered pod management, persistent storage, and real-world use cases for stateful applications in Kubernetes

09.09.2025

Migration Diary Part 2: Moving Logs from Grafana Cloud to Kubernetes

Setting up Loki and Alloy for log aggregation in our Kubernetes cluster. Learning what all those Loki components actually do.

07.09.2025

Migration Diary Part 1: Moving Metrics from Grafana Cloud to Kubernetes

Moving our monitoring from Grafana Cloud to self-hosted Prometheus and Grafana on Kubernetes. Turns out most apps already had metrics support, just needed to enable it.

05.09.2025

Creating a Least-Privilege Monitoring User in Zalando Postgres Operator

How I solved the challenge of creating a monitoring-only user with minimal permissions in a GitOps-managed Postgres cluster

03.09.2025

Zero-Downtime Helm App Upgrade in Production

How to upgrade a Helm-managed application in production with zero downtime using GitOps and Kubernetes RollingUpdate strategy

29.08.2025

Why I'm Obsessed with Uptime: The Real Cost of Downtime

My journey into understanding why every millisecond matters in DevOps, and what the research taught me about building reliable systems

24.08.2025

Managing Secrets in Kubernetes with External Secrets Operator

A comprehensive guide to implementing External Secrets Operator for secure secret management in Kubernetes clusters