The liveness probe that makes your uptime worse
Liveness, readiness and startup probes do different jobs. Conflating them is one of the few Kubernetes misconfigurations that actively causes outages.
Topic
Kubernetes
Upstream Kubernetes: scheduling, networking, storage and the failure modes that teach you the most.
5 posts
Default-deny NetworkPolicy without breaking DNS
Locking a namespace to default-deny and adding traffic back safely, why DNS breaks first, and the selector mistake that silently allows far more than intended.
Requests and limits — CPU and memory are not analogous
What happens when a container exceeds its CPU limit versus its memory limit, why the two answers differ, and what that means for how you set them.
Horizontal Pod Autoscaler: why it scales late, or not at all
The requests dependency nobody mentions, how the HPA replica formula really works, stabilisation windows, and why CPU is the wrong signal for most queue workloads.
PodDisruptionBudgets: the reason your node drain hangs
What a PDB does and does not protect against, the single-replica trap that blocks upgrades forever, and how to set minAvailable so maintenance can still happen.