Why Most Kubernetes Migrations Fail on Day Two

Mon, 22 Jun 2026 00:00:00 +0000

Most Kubernetes migrations don’t fail during the migration. They fail about two weeks after, when the first real incident hits and the team realizes nobody actually decided how things work day-to-day on the new platform.

The pattern

It usually goes like this:

A team spends months getting workloads running on Kubernetes.
Day one goes fine — traffic is cut over, dashboards are green.
Two to three weeks later, a pod starts crash-looping at 2am, or a node gets cordoned during a deploy, or a HorizontalPodAutoscaler does something nobody expected under load.
Nobody can answer “who owns this” or “what’s the rollback” with confidence, because those questions were never answered before go-live.

The cluster isn’t the hard part. The hard part is everything that has to be true around the cluster for it to be operable by a team that didn’t build it.

Kubernetes on allans.dev

Why Most Kubernetes Migrations Fail on Day Two

The pattern