Merge pull request #8827 from zalando-incubator/karpenter-local-storage-raid0

Assume RAID0 for instances with local storage

Author: mikkeloscar

cluster/config-defaults.yaml

@@ -44,6 +44,11 @@ karpenter_max_pods_per_node: "32"
 # legacy => 0.36.2-main-25.patched
 karpenter_version: "current"
 
+# configure whether karpenter should assume instances with local storage use
+# RAID0 for ephemeral pod storage.
+# Our AMI configured RAID0 at boot.
+karpenter_instance_storage_raid0: "true"
+
 # ALB config created by kube-aws-ingress-controller
 kube_aws_ingress_controller_ssl_policy: "ELBSecurityPolicy-TLS-1-2-2017-01"
 kube_aws_ingress_controller_idle_timeout: "1m"

cluster/node-pools/worker-karpenter/provisioners.yaml

@@ -35,6 +35,9 @@ spec:
         deleteOnTermination: {{ .NodePool.ConfigItems.ebs_root_volume_delete_on_termination }}
         volumeSize: {{ .NodePool.ConfigItems.ebs_root_volume_size }}Gi
         volumeType: gp3
+  # {{ if eq .NodePool.ConfigItems.karpenter_instance_storage_raid0 "true" }}
+  instanceStorePolicy: RAID0
+  # {{ end }}
   # If you enable this option, the Amazon EC2 console displays monitoring graphs with a 1-minute period for the instances that Karpenter launches.
   detailedMonitoring: false
   tags: