README.md

To install

• Make sure your environment has Admin access to a AWS Account
• Double check the variables in the Makefile and tfvars
• make tf/plan
• make tf/apply
• make eks/validate
• make ebs/install
• make karpenter/install
• make karpenter/resources

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Create workload for testing

• make k8s/workloads
• export KUBECONFIG=/tmp/demo-eu-west-3-kubeconfig
• kubectl get pod -n default

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Patch nodepool and watch pod

• kubectl patch nodepool testarm64 --type merge -p '{"spec":{"template":{"metadata":{"annotations":{"restart/epoch":"'"$(date +%s)"'"}}}}}'
• kubectl get pod -w
  • watch out for 6m for pod to become running on new node
• kubectl get events -w
  • watch out for Multi-Attach error for volume "pvc-10104513-ea96-432e-868e-330eb14ea2bb" Volume is already exclusively attached to one node and can't be attached to another

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Results

Some results from my testing collected in Results

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Conclusions

• All version of EKS 1.26 to 1.29 , with Node Graceful Shutdown enabled , are affected by the multi attach error problem when using Karpenter with EBS CSI Driver
  • during Drift Manager node replacement
  • during Spot instance interruption
  • during node Consolidation node replacement
  • when deleting nodeclaim or node and using karpenter finalizer