kubernetes/kops · error

found multiple EventBridge rules with the same name %s

Error message

found multiple EventBridge rules with the same name %s

What it means

ListRules returned more than one rule matching the kOps cluster-name prefix; kOps expects a uniquely named rule and cannot decide which one to delete.

Source

Thrown at pkg/model/awsmodel/nodeterminationhandler.go:211

	}

	clusterName := b.ClusterName()
	clusterNamePrefix := awsup.GetClusterName40(clusterName)
	ruleName := aws.String(clusterNamePrefix + "-" + rebalanceEvent.name)

	eventBridge := cloud.(awsup.AWSCloud).EventBridge()
	request := &eventbridge.ListRulesInput{
		NamePrefix: ruleName,
	}
	response, err := eventBridge.ListRules(c.Context(), request)
	if err != nil {
		return fmt.Errorf("listing EventBridge rules: %w", err)
	}
	if response == nil || len(response.Rules) == 0 {
		return nil
	}
	if len(response.Rules) > 1 {
		return fmt.Errorf("found multiple EventBridge rules with the same name %s", *ruleName)
	}

	rule := response.Rules[0]

	tagResponse, err := eventBridge.ListTagsForResource(c.Context(), &eventbridge.ListTagsForResourceInput{ResourceARN: rule.Arn})
	if err != nil {
		return fmt.Errorf("listing tags for EventBridge rule: %w", err)
	}

	owned := false
	ownershipTag := "kubernetes.io/cluster/" + b.Cluster.ObjectMeta.Name
	for _, tag := range tagResponse.Tags {
		if fi.ValueOf(tag.Key) == ownershipTag && fi.ValueOf(tag.Value) == "owned" {
			owned = true
			break
		}
	}
	if !owned {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Inspect the duplicate EventBridge rules in the console and remove the stale one
2. Ensure no other tool creates rules with the same cluster-name prefix
3. Re-run the operation

When it happens

Trigger: Thrown at pkg/model/awsmodel/nodeterminationhandler.go:211 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/b26f9e4b0227bd6f. Report an issue: GitHub.