https://szymonkocur.com/tags/networking/Recent content in Networking on Szymon KocurHugoen-usThu, 02 Apr 2026 00:00:00 +0000https://szymonkocur.com/posts/kubernetes-prestop-hooks-zero-downtime/Thu, 02 Apr 2026 00:00:00 +0000https://szymonkocur.com/posts/kubernetes-prestop-hooks-zero-downtime/If you’ve ever deployed to Kubernetes and seen users briefly hit a blank page or a 502 Bad Gateway error, you’re not alone. I ran into this exact issue on a production GKE cluster running a Next.js frontend with multiple replicas behind a Google Cloud Load Balancer. The symptom: during a rolling update, for a few seconds, some users would see a black screen with a “failed upstream” message. Then it would resolve on its own.