We're having a discussion at work about how Karpenter selects types of instances, specifically within the T family. I'm curious why Karpenter would provision burstable instances if they are included in the node pool. Does it take Quality of Service (QoS) into account? Any insights or documentation on this would be super helpful!
2 Answers
Karpenter's decision-making really focuses on optimizing for cost and workload needs. If you want to make sure that burstable instances are used, you should consider creating a node pool just for them. Otherwise, Karpenter will select the most cost-effective option it can find, which might not always be burstable.
It's a good idea to set up a separate node pool specifically for burstable instances. Mixing them with regular instances might not be the best approach. Karpenter typically chooses the most appropriate worker nodes based on pricing and the current workload. If you solely want burstable instances, creating a dedicated node class is the way to go.
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