kubernetes/kops · error

error populating configuration: %v

Error message

error populating configuration: %v

What it means

For Cluster objects, RunCreate calls cloudup.PerformAssignments to fill in defaults requiring cloud queries (subnets, network CIDR assignment). Failures from cloud API access or invalid networking config are wrapped as "error populating configuration: %v".

Source

Thrown at cmd/kops/create.go:143

		sections := text.SplitContentToSections(contents)
		for _, section := range sections {
			o, gvk, err := kopscodecs.Decode(section, nil)
			if err != nil {
				return fmt.Errorf("error parsing file %q: %v", f, err)
			}

			switch v := o.(type) {
			case *kopsapi.Cluster:
				cloud, err := cloudup.BuildCloud(v)
				if err != nil {
					return err
				}

				// Adding a PerformAssignments() call here as the user might be trying to use
				// the new `-f` feature, with an old cluster definition.
				err = cloudup.PerformAssignments(v, vfsContext, cloud)
				if err != nil {
					return fmt.Errorf("error populating configuration: %v", err)
				}
				_, err = clientset.CreateCluster(ctx, v)
				if err != nil {
					if apierrors.IsAlreadyExists(err) {
						return fmt.Errorf("cluster %q already exists", v.ObjectMeta.Name)
					}
					return fmt.Errorf("error creating cluster: %v", err)
				}
				fmt.Fprintf(&sb, "Created cluster/%s\n", v.ObjectMeta.Name)
				clusters = append(clusters, v)
				// cSpec = true

			case *kopsapi.InstanceGroup:
				clusterName = v.ObjectMeta.Labels[kopsapi.LabelClusterName]
				if clusterName == "" {
					return fmt.Errorf("must specify %q label with cluster name to create instanceGroup", kopsapi.LabelClusterName)
				}
				cluster, err := clientset.GetCluster(ctx, clusterName)

View on GitHub (pinned to 4c8573c808)

Solutions

1. Export valid cloud provider credentials and retry
2. Ensure the cloud/region in the spec is reachable and the account has permission to describe VPCs/networks
3. Explicitly set networkCIDR and subnet CIDRs in the manifest so assignment logic has less to compute
4. Check the wrapped inner error for the exact failing field (e.g. duplicate CIDR) and correct the cluster spec

Example fix

// before (cluster.yaml)
networkCIDR: ""
// after
networkCIDR: 10.0.0.0/16

// pre-flight cloud access check
cloud, err := cloudup.BuildCloud(cluster)
if err != nil {
    return fmt.Errorf("cloud unreachable: %v", err)
}
if err := cloud.VPC("vpc-id"); err != nil {
    return fmt.Errorf("cannot describe VPC: %v", err)
}

if err := PerformAssignments(ctx); err != nil {
    if isCredentialError(err) {
        log.Printf("fix cloud credentials (aws sts get-caller-identity) and retry")
    }
    return fmt.Errorf("error populating configuration: %v", err)
}

When it happens

Trigger: `kops create -f cluster.yaml` where PerformAssignments cannot query the cloud (missing credentials, region issues) or cannot allocate/validate subnets and CIDRs from the spec.

Common situations: Missing or expired cloud credentials (AWS_/GCE_ env vars, cloud config); specifying subnets/CIDRs that conflict or are unassignable; new-style cluster definitions used with old tooling without cloud access.

Related errors

• error populating configuration: %w
• DeviceName not set for volume
• Error too many '=' (%d) in %s
• --region is required (when --external)
• error initializing AWS client: %v

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/e072f5196ab4fea5. Report an issue: GitHub.