Cluster Autoscaler pod fails with error "MissingRegion"

[sivachandran-s]

cluster-autoscaler: 1.30

Component version:

What k8s version are you using (kubectl version)?:

Client Version: v1.30.2
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.30.4-eks-a737599

kubectl version Output

$ kubectl version

What environment is this in?: Test

What did you expect to happen?:

I1014 17:54:22.064047 1 main.go:644] Cluster Autoscaler 1.30.0
I1014 17:54:22.155804 1 leaderelection.go:250] attempting to acquire leader lease kube-system/cluster-autoscaler...
I1014 17:54:22.168685 1 leaderelection.go:260] successfully acquired lease kube-system/cluster-autoscaler
I1014 17:54:22.169026 1 event_sink_logging_wrapper.go:48] Event(v1.ObjectReference{Kind:"Lease", Namespace:"kube-system", Name:"cluster-autoscaler", UID:"b82b9120-4fc3-4bc2-8b92-21daf9dd151f", APIVersion:"coordination.k8s.io/v1", ResourceVersion:"19453", FieldPath:""}): type: 'Normal' reason: 'LeaderElection' cluster-autoscaler-7c5484cd44-59xj8 became leader
I1014 17:54:22.251583 1 framework.go:373] "the scheduler starts to work with those plugins" Plugins={"PreEnqueue":{"Enabled":[{"Name":"SchedulingGates","Weight":0}],"Disabled":null},"QueueSort":{"Enabled":[{"Name":"PrioritySort","Weight":0}],"Disabled":null},"PreFilter":{"Enabled":[{"Name":"NodeAffinity","Weight":0},{"Name":"NodePorts","Weight":0},{"Name":"NodeResourcesFit","Weight":0},{"Name":"VolumeRestrictions","Weight":0},{"Name":"EBSLimits","Weight":0},{"Name":"GCEPDLimits","Weight":0},{"Name":"NodeVolumeLimits","Weight":0},{"Name":"AzureDiskLimits","Weight":0},{"Name":"VolumeBinding","Weight":0},{"Name":"VolumeZone","Weight":0},{"Name":"PodTopologySpread","Weight":0},{"Name":"InterPodAffinity","Weight":0}],"Disabled":null},"Filter":{"Enabled":[{"Name":"NodeUnschedulable","Weight":0},{"Name":"NodeName","Weight":0},{"Name":"TaintToleration","Weight":0},{"Name":"NodeAffinity","Weight":0},{"Name":"NodePorts","Weight":0},{"Name":"NodeResourcesFit","Weight":0},{"Name":"VolumeRestrictions","Weight":0},{"Name":"EBSLimits","Weight":0},{"Name":"GCEPDLimits","Weight":0},{"Name":"NodeVolumeLimits","Weight":0},{"Name":"AzureDiskLimits","Weight":0},{"Name":"VolumeBinding","Weight":0},{"Name":"VolumeZone","Weight":0},{"Name":"PodTopologySpread","Weight":0},{"Name":"InterPodAffinity","Weight":0}],"Disabled":null},"PostFilter":{"Enabled":[{"Name":"DefaultPreemption","Weight":0}],"Disabled":null},"PreScore":{"Enabled":[{"Name":"TaintToleration","Weight":0},{"Name":"NodeAffinity","Weight":0},{"Name":"NodeResourcesFit","Weight":0},{"Name":"VolumeBinding","Weight":0},{"Name":"PodTopologySpread","Weight":0},{"Name":"InterPodAffinity","Weight":0},{"Name":"NodeResourcesBalancedAllocation","Weight":0}],"Disabled":null},"Score":{"Enabled":[{"Name":"TaintToleration","Weight":3},{"Name":"NodeAffinity","Weight":2},{"Name":"NodeResourcesFit","Weight":1},{"Name":"VolumeBinding","Weight":1},{"Name":"PodTopologySpread","Weight":2},{"Name":"InterPodAffinity","Weight":2},{"Name":"NodeResourcesBalancedAllocation","Weight":1},{"Name":"ImageLocality","Weight":1}],"Disabled":null},"Reserve":{"Enabled":[{"Name":"VolumeBinding","Weight":0}],"Disabled":null},"Permit":{"Enabled":null,"Disabled":null},"PreBind":{"Enabled":[{"Name":"VolumeBinding","Weight":0}],"Disabled":null},"Bind":{"Enabled":[{"Name":"DefaultBinder","Weight":0}],"Disabled":null},"PostBind":{"Enabled":null,"Disabled":null},"MultiPoint":{"Enabled":null,"Disabled":null}}
I1014 17:54:22.265983 1 cloud_provider_builder.go:30] Building aws cloud provider.
E1014 17:54:25.405156 1 aws_cloud_provider.go:433] Failed to generate AWS EC2 Instance Types: MissingRegion: could not find region configuration, falling back to static list with last update time: 2024-04-08

What happened instead?:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:
cluster-autoscaler pod is crashing in our setup with the missing Region error , how to solve it

Also when i try to deploy 1.29 EKS version and 1.29 cluster-autoscaler version i am not seeing any issue even when i tried to perform the EKS upgrade from 1.29 to 1.30 i am not seeing this issue either . Only in the fresh install of 1.30 version of EKS and cluster-autoscaler i am getting the reported issue.

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[adrianmoisey]

/area cluster-autoscaler

[layor2257]

i started experiecing this issues also, i added this environment variable block:
env {
name = "AWS_REGION"
value = "eu-west-1"
}

  but now I am getting this error:
  
  I1016 10:13:31.629902       1 auto_scaling_groups.go:360] Regenerating instance to ASG map for ASG names: []

I1016 10:13:31.629918 1 auto_scaling_groups.go:367] Regenerating instance to ASG map for ASG tags: map[k8s.io/cluster-autoscaler/enabled: k8s.io/cluster-autoscaler/fcmb-stg-tco0001-cluster:]
I1016 10:13:34.932762 1 trace.go:219] Trace[774965466]: "Reflector ListAndWatch" name:k8s.io/autoscaler/cluster-autoscaler/utils/kubernetes/listers.go:212 (16-Oct-2024 10:13:24.533) (total time: 10398ms):
Trace[774965466]: ---"Objects listed" error: 10398ms (10:13:34.932)
Trace[774965466]: ---"Resource version extracted" 0ms (10:13:34.932)
Trace[774965466]: ---"Objects extracted" 0ms (10:13:34.932)
Trace[774965466]: ---"SyncWith done" 0ms (10:13:34.932)
Trace[774965466]: ---"Resource version updated" 0ms (10:13:34.932)
Trace[774965466]: [10.398963846s] [10.398963846s] END
I1016 10:13:35.129666 1 trace.go:219] Trace[1852186258]: "Reflector ListAndWatch" name:k8s.io/client-go/informers/factory.go:150 (16-Oct-2024 10:13:24.530) (total time: 10598ms):
Trace[1852186258]: ---"Objects listed" error: 10507ms (10:13:35.038)
Trace[1852186258]: ---"Resource version extracted" 0ms (10:13:35.038)
Trace[1852186258]: ---"Objects extracted" 90ms (10:13:35.128)
Trace[1852186258]: ---"SyncWith done" 0ms (10:13:35.129)
Trace[1852186258]: ---"Resource version updated" 0ms (10:13:35.129)
Trace[1852186258]: [10.598647288s] [10.598647288s] END
E1016 10:13:36.828775 1 aws_manager.go:125] Failed to regenerate ASG cache: NoCredentialProviders: no valid providers in chain. Deprecated.
For verbose messaging see aws.Config.CredentialsChainVerboseErrors
F1016 10:13:36.828823 1 aws_cloud_provider.go:419] Failed to create AWS Manager: NoCredentialProviders: no valid providers in chain. Deprecated.
For verbose messaging see aws.Config.CredentialsChainVerboseErrors

[sivachandran-s]

One workaround which i followed is updating the EKS AMI type to "AL2_x86_64" instead of using the default type:
.