kubernetes/kops · error

creating/updating subnet: %w

Error message

creating/updating subnet: %w

What it means

BeginCreateOrUpdate for the subnet failed to start the LRO; fires on ARM validation errors (bad address prefix or delegation), conflicts with existing subnets, or authorization failures.

Source

Thrown at upup/pkg/fi/cloudup/azure/subnet.go:43

)

// SubnetsClient is a client for managing subnets.
type SubnetsClient interface {
	CreateOrUpdate(ctx context.Context, resourceGroupName, virtualNetworkName, subnetName string, parameters network.Subnet) (*network.Subnet, error)
	List(ctx context.Context, resourceGroupName, virtualNetworkName string) ([]*network.Subnet, error)
	Delete(ctx context.Context, resourceGroupName, vnetName, subnetName string) error
}

type subnetsClientImpl struct {
	c *network.SubnetsClient
}

var _ SubnetsClient = (*subnetsClientImpl)(nil)

func (c *subnetsClientImpl) CreateOrUpdate(ctx context.Context, resourceGroupName, virtualNetworkName, subnetName string, parameters network.Subnet) (*network.Subnet, error) {
	future, err := c.c.BeginCreateOrUpdate(ctx, resourceGroupName, virtualNetworkName, subnetName, parameters, nil)
	if err != nil {
		return nil, fmt.Errorf("creating/updating subnet: %w", err)
	}
	resp, err := future.PollUntilDone(ctx, nil)
	if err != nil {
		return nil, fmt.Errorf("waiting for subnet create/update completion: %w", err)
	}
	return &resp.Subnet, err
}

func (c *subnetsClientImpl) List(ctx context.Context, resourceGroupName, virtualNetworkName string) ([]*network.Subnet, error) {
	var l []*network.Subnet
	pager := c.c.NewListPager(resourceGroupName, virtualNetworkName, nil)
	for pager.More() {
		resp, err := pager.NextPage(ctx)
		if err != nil {
			return nil, fmt.Errorf("listing subnets: %w", err)
		}
		l = append(l, resp.Value...)
	}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Inspect the wrapped ResponseError code and fix address prefixes/delegations
2. Verify Network Contributor permissions on the virtual network
3. Retry after transient ARM failures

When it happens

Trigger: Thrown at upup/pkg/fi/cloudup/azure/subnet.go:43 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/ca1a3a1ff92f9387. Report an issue: GitHub.