kubernetes/kops · error

unable to find Network ID %q

Error message

unable to find Network ID %q

What it means

Shared-VPC resolution failure in PerformAssignments on AWS: the cluster uses a shared VPC (networkID set) with no explicit NetworkCIDR, and FindVPCInfo returned nil — meaning no VPC with that ID is visible to the credentials in use, so its CIDR cannot be adopted.

Source

Thrown at upup/pkg/fi/cloudup/defaults.go:86

	if cloud == nil {
		return fmt.Errorf("cloud cannot be nil")
	}

	if cloud.ProviderID() == kops.CloudProviderGCE {
		if err := gce.PerformNetworkAssignments(ctx, c, cloud); err != nil {
			return err
		}
	}

	if cloud.ProviderID() == kops.CloudProviderAWS && c.Spec.Networking.NetworkCIDR == "" {
		if c.SharedVPC() {
			vpcInfo, err := cloud.FindVPCInfo(c.Spec.Networking.NetworkID)
			if err != nil {
				return err
			}
			if vpcInfo == nil {
				return fmt.Errorf("unable to find Network ID %q", c.Spec.Networking.NetworkID)
			}
			c.Spec.Networking.NetworkCIDR = vpcInfo.CIDR
			if c.Spec.Networking.NetworkCIDR == "" {
				return fmt.Errorf("unable to infer NetworkCIDR from Network ID, please specify --network-cidr")
			}
		} else {
			// TODO: Choose non-overlapping networking CIDRs for VPCs, using vpcInfo
			c.Spec.Networking.NetworkCIDR = defaultAWSNetworkCIDR
		}

		// Amazon VPC CNI uses the same network
		if c.Spec.Networking.AmazonVPC != nil && c.Spec.Networking.NonMasqueradeCIDR != "::/0" {
			c.Spec.Networking.NonMasqueradeCIDR = c.Spec.Networking.NetworkCIDR
		}
	}

	if cloud.ProviderID() == kops.CloudProviderAzure && c.Spec.Networking.NetworkCIDR == "" {
		if c.SharedVPC() {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Verify the NetworkID is a correct existing VPC ID
2. Grant the kOps IAM user access to describe the shared VPC in the network account
3. Or set --network-cidr explicitly to skip the lookup

When it happens

Trigger: Thrown at upup/pkg/fi/cloudup/defaults.go:86 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/fdb8adaa6447adb3. Report an issue: GitHub.