kubernetes/kops · error

Failed to get fixed ip for associated pool: %v

Error message

Failed to get fixed ip for associated pool: %v

What it means

GetServerFixedIP resolves a Nova server's fixed IP on a named interface for use as the Octavia pool member address, wrapped in vfs.RetryWithBackoff. Each failed lookup is wrapped as this error and retried; if the retry budget is exhausted, the error is returned to RenderOpenstack and member association aborts.

Source

Thrown at upup/pkg/fi/cloudup/openstacktasks/poolassociation.go:148

			return fi.RequiredField("Name")
		}
	} else {
		if changes.ID != nil {
			return fi.CannotChangeField("ID")
		}
		if changes.Name != nil {
			return fi.CannotChangeField("Name")
		}
	}
	return nil
}

func GetServerFixedIP(client *gophercloud.ServiceClient, server *servers.Server, interfaceName string) (memberAddress string, err error) {
	done, err := vfs.RetryWithBackoff(readBackoff, func() (bool, error) {
		memberAddress, err = openstack.GetServerFixedIP(server, interfaceName)
		if err != nil {
			// sometimes provisioning interfaces is slow, that is why we need retry the interface from the server
			return false, fmt.Errorf("Failed to get fixed ip for associated pool: %v", err)
		}
		return true, nil
	})
	if done {
		return memberAddress, nil
	}
	return memberAddress, err
}

func (_ *PoolAssociation) RenderOpenstack(t *openstack.OpenstackAPITarget, a, e, changes *PoolAssociation) error {
	if a == nil {
		serverList, err := t.Cloud.ListInstances(servers.ListOpts{
			Name: fmt.Sprintf("^%s", fi.ValueOf(e.ServerPrefix)),
		})
		if err != nil {
			return fmt.Errorf("error listing servers: %v", err)
		}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Verify the InterfaceName in the cluster spec matches the server's actual port/network name (`openstack port list --server <id>`)
2. Retry `kops update cluster` after nodes finish booting; the retry backoff may simply need more time
3. Check the wrapped inner error: 'no fixed ip found' means wrong interface; API errors mean Nova/Neutron problems
4. Ensure the node subnet has DHCP/IP allocation working and the port reached ACTIVE state
5. Increase readBackoff timing in a local build if provisioning is persistently slow in your cloud

Example fix

// before
interfaceName: fi.String("eth1") // no such port on server
// after
interfaceName: fi.String("eth0") // matches `openstack port list --server <id>`

// confirm the interface/port exists before association
out, err := exec.Command("openstack", "port", "list", "--server", serverID, "--long").Output()
if err != nil || !bytes.Contains(out, []byte(interfaceName)) {
	return fmt.Errorf("interface %q not yet available on server %s", interfaceName, serverID)
}

func hasFixedIPOnInterface(server *servers.Server, interfaceName string) bool {
	for _, addrMap := range server.Addresses {
		for _, a := range addrMap.([]interface{}) {
			if m, ok := a.(map[string]interface{}); ok && m["OS-EXT-IPS:type"] == "fixed" {
				return true
			}
		}
	}
	return false
}

memberAddress, err := GetServerFixedIP(client, &server, ifaceName)
if err != nil {
	// GetServerFixedIP already retries with readBackoff; add an outer
	// bounded retry with longer delay for slow-provisioning clouds
	return retryLonger(backoff_5m)
}

When it happens

Trigger: openstack.GetServerFixedIP(server, interfaceName) cannot find an interface/port matching interfaceName on the server within the readBackoff window: the port is still provisioning, the interfaceName doesn't match any port's network/device name, or the server has no fixed IP on that subnet yet.

Common situations: Nodes just booted and ports not yet ACTIVE when the loadbalancer task runs; InterfaceName in the cluster spec mistyped (e.g. 'eth0' vs actual Neutron port name); instance boot failure leaving the server without ports; slow Neutron provisioning exceeding the retry backoff.

Related errors

• error deleting instance: %s
• unabled to create listener: %v
• did not find floatingsubnet for LB
• Failed to list L3 floating ip: %v
• Could not find port floatingips port=%s

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/71f25768887566d0. Report an issue: GitHub.