Mastering Kubernetes - Second Edition

Quotas, shares, and limits

Kubernetes is a multitenant system. It is designed to use resources efficiently, but it schedules pods and allocates resources based on a system of checks and balances between available quotas and limits per namespace, and requests for guaranteed resources from pods and containers. We will dive into the details later in the book. Here, we'll just consider what can go wrong and how to detect it. There are several bad outcomes you can run into:

• Insufficient resources: If a pod requires a certain amount of CPU or memory, and there is no node with available capacity, then the pod can't be scheduled.
• Under-utilization: A pod may declare that it requires a certain amount of CPU or memory, and Kubernetes will oblige, ...