[Solved] You configured Cluster Autoscaler with:--nodes=1:4:group-xBut the cluster never scales down nodes even when they are idle. What could be a likely cause? | Kubernetes

Kubernetes - Resource Management

You configured Cluster Autoscaler with:

--nodes=1:4:group-x

But the cluster never scales down nodes even when they are idle. What could be a likely cause?

AScale down is disabled or scale down delay is too long

BCluster Autoscaler only scales up, not down

CMinimum nodes is set to 1, so it never removes nodes below that

DNode group name is incorrect

Step-by-Step Solution

Solution:

Step 1: Consider scale-down configuration
Scale down might be disabled or the scale-down delays (like --scale-down-delay-after-add) are set too long, causing no scale-down even for idle nodes.
Step 2: Distinguish from other options
Min nodes=1 allows scaling down to 1 but not below; incorrect node group would affect scale-up too.
Final Answer:
Scale down is disabled or scale down delay is too long -> Option A
Quick Check:
Disabled scale-down or long delay = no scaling down [OK]

Quick Trick: Check if scale-down is disabled or delay too high [OK]

Common Mistakes:

Master "Resource Management" in Kubernetes

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