Observed Signal · Jul 17, 2026 · Technical Guide · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Fix AKS Memory Eviction with Azure Disk CSI
This technical guide explains a cascade that causes stateful pods on Azure Kubernetes Service (AKS) to be evicted under node MemoryPressure, leaving Azure Disk CSI VolumeAttachment objects stuck in Terminating and blocking pod rescheduling. It details immediate remediation (force-removing the VolumeAttachment finalizer after verifying the disk is not attached), root-cause fixes (set explicit resource requests/limits and use Guaranteed QoS), kubelet eviction tuning via AKS KubeletConfig, and operational controls such as PodDisruptionBudgets, OPA/Gatekeeper admission policies, Checkov IaC scanning, and node-pool sizing. The article provides CLI and manifest examples to apply each fix and CI/CD prevention measures to avoid recurrence.
Practical remediation and best practices for AKS/Azure Disk CSI reliability are useful to cloud operators running stateful workloads on Azure but do not represent industry-wide platform changes.
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Key Takeaways & Evidence Grounding
- Kubelet reports MemoryPressure and evicts pods in QoS priority order: BestEffort first, then Burstable, then Guaranteed.
- When a pod is force-evicted, the Azure Disk CSI driver can fail to detach the PersistentVolume, leaving a VolumeAttachment stuck in Terminating and causing Multi-Attach errors on reschedule.
- Immediate remediation: identify the stuck VolumeAttachment and force-delete its finalizer (kubectl patch volumeattachment <va-name> -p '{"metadata":{"finalizers":null}}' --type=merge) after confirming the disk is not attached to any VM.
- Preventive fixes: define resources.requests and limits (use requests==limits for Guaranteed QoS), add PodDisruptionBudget, tune kubelet eviction thresholds via AKS node pool kubeletConfig, and right-size node pools to keep requests below ~70% of allocatable memory.
- CI/CD and admission controls recommended: OPA/Gatekeeper constraint to block BestEffort pods and Checkov scans of Kubernetes manifests for CPU/memory requests and limits.
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