Your Kubernetes Cluster is Unbalanced (And the Scheduler Won't Fix It)
· 6 min read
Photo by Paul Hanaoka on Unsplash
The Kubernetes scheduler is lazy. It places pods when they're created, picks the best node at that moment, and never thinks about it again. Weeks later, one node is at 75% memory while another sits at 40%. The scheduler doesn't care - its job was done the moment the pod started.
Descheduler fixes this. It runs every few minutes, finds imbalanced nodes, and evicts pods so the scheduler gets another chance to place them better. Set it up once, cluster self-balances automatically.
Here's how to configure it for a homelab. Takes about 20 minutes to get right.