middleware/kubernetes: Implement current federation beta (#723)

* federation initial commit

* UTs/bugfixes

* federation bits

* polish, cover UT gaps

* add TODO

* go fmt & todo note

* remove unrelated change

* pr changes

* start node watcher

* get real node name

* remove unused case

middleware/kubernetes/README.md

@@ -115,6 +115,12 @@ kubernetes coredns.local {
 	# a path to a file structured like resolv.conf.
 	upstream 12.34.56.78:53
 	
+	# federation <federation-name> <federation-domain>
+	#
+	# Defines federation membership.  One line for each federation membership.
+	# Each line consists of the name of the federation, and the domain.
+	federation myfed foo.example.com
+	
 	# fallthrough
 	#
 	# If a query for a record in the cluster zone results in NXDOMAIN,

middleware/kubernetes/controller.go

@@ -39,6 +39,9 @@ type dnsController interface {
 	ServiceList() []*api.Service
 	PodIndex(string) []interface{}
 	EndpointsList() api.EndpointsList
+
+	GetNodeByName(string) (api.Node, error)
+
 	Run()
 	Stop() error
 }
@@ -48,10 +51,11 @@ type dnsControl struct {
 
 	selector *labels.Selector
 
-	svcController *cache.Controller
+	svcController  *cache.Controller
-	podController *cache.Controller
+	podController  *cache.Controller
-	nsController  *cache.Controller
+	nsController   *cache.Controller
-	epController  *cache.Controller
+	epController   *cache.Controller
+	nodeController *cache.Controller
 
 	svcLister cache.StoreToServiceLister
 	podLister cache.StoreToPodLister
@@ -66,8 +70,12 @@ type dnsControl struct {
 	stopCh   chan struct{}
 }
 
+type dnsControlOpts struct {
+	initPodCache bool
+}
+
 // newDNSController creates a controller for CoreDNS.
-func newdnsController(kubeClient *kubernetes.Clientset, resyncPeriod time.Duration, lselector *labels.Selector, initPodCache bool) *dnsControl {
+func newdnsController(kubeClient *kubernetes.Clientset, resyncPeriod time.Duration, lselector *labels.Selector, opts dnsControlOpts) *dnsControl {
 	dns := dnsControl{
 		client:   kubeClient,
 		selector: lselector,
@@ -84,7 +92,7 @@ func newdnsController(kubeClient *kubernetes.Clientset, resyncPeriod time.Durati
 		cache.ResourceEventHandlerFuncs{},
 		cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
 
-	if initPodCache {
+	if opts.initPodCache {
 		dns.podLister.Indexer, dns.podController = cache.NewIndexerInformer(
 			&cache.ListWatch{
 				ListFunc:  podListFunc(dns.client, namespace, dns.selector),
@@ -368,3 +376,16 @@ func (dns *dnsControl) EndpointsList() api.EndpointsList {
 
 	return epl
 }
+
+func (dns *dnsControl) GetNodeByName(name string) (api.Node, error) {
+	v1node, err := dns.client.Core().Nodes().Get(name)
+	if err != nil {
+		return api.Node{}, err
+	}
+	var apinode api.Node
+	err = v1.Convert_v1_Node_To_api_Node(v1node, &apinode, nil)
+	if err != nil {
+		return api.Node{}, err
+	}
+	return apinode, nil
+}

middleware/kubernetes/federation.go

@@ -0,0 +1,102 @@
+package kubernetes
+
+import (
+	"net"
+	"strings"
+
+	"github.com/coredns/coredns/middleware/etcd/msg"
+)
+
+type Federation struct {
+	name string
+	zone string
+}
+
+var localNodeName string
+var federationZone string
+var federationRegion string
+
+const (
+	// TODO: Do not hardcode these labels. Pull them out of the API instead.
+	//
+	// We can get them via ....
+	//   import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	//     metav1.LabelZoneFailureDomain
+	//     metav1.LabelZoneRegion
+	//
+	// But importing above breaks coredns with flag collision of 'log_dir'
+
+	LabelAvailabilityZone = "failure-domain.beta.kubernetes.io/zone"
+	LabelRegion           = "failure-domain.beta.kubernetes.io/region"
+)
+
+// stripFederation removes the federation segment from the segment list, if it
+// matches a configured federation name.
+func (k *Kubernetes) stripFederation(segs []string) (string, []string) {
+
+	if len(segs) < 3 {
+		return "", segs
+	}
+	for _, f := range k.Federations {
+		if f.name == segs[len(segs)-2] {
+			fed := segs[len(segs)-2]
+			segs[len(segs)-2] = segs[len(segs)-1]
+			segs = segs[:len(segs)-1]
+			return fed, segs
+		}
+	}
+	return "", segs
+}
+
+// federationCNAMERecord returns a service record for the requested federated service
+// with the target host in the federated CNAME format which the external DNS provider
+// should be able to resolve
+func (k *Kubernetes) federationCNAMERecord(r recordRequest) msg.Service {
+
+	myNodeName := k.localNodeName()
+	node, err := k.APIConn.GetNodeByName(myNodeName)
+	if err != nil {
+		return msg.Service{}
+	}
+
+	for _, f := range k.Federations {
+		if f.name != r.federation {
+			continue
+		}
+		if r.endpoint == "" {
+			return msg.Service{
+				Key:  strings.Join([]string{msg.Path(r.zone, "coredns"), r.typeName, r.federation, r.namespace, r.service}, "/"),
+				Host: strings.Join([]string{r.service, r.namespace, r.federation, r.typeName, node.Labels[LabelAvailabilityZone], node.Labels[LabelRegion], f.zone}, "."),
+			}
+		}
+		return msg.Service{
+			Key:  strings.Join([]string{msg.Path(r.zone, "coredns"), r.typeName, r.federation, r.namespace, r.service, r.endpoint}, "/"),
+			Host: strings.Join([]string{r.endpoint, r.service, r.namespace, r.federation, r.typeName, node.Labels[LabelAvailabilityZone], node.Labels[LabelRegion], f.zone}, "."),
+		}
+	}
+
+	return msg.Service{}
+}
+
+func (k *Kubernetes) localNodeName() string {
+	if localNodeName != "" {
+		return localNodeName
+	}
+	localIP := k.localPodIP()
+	if localIP == nil {
+		return ""
+	}
+	// Find endpoint matching localIP
+	endpointsList := k.APIConn.EndpointsList()
+	for _, ep := range endpointsList.Items {
+		for _, eps := range ep.Subsets {
+			for _, addr := range eps.Addresses {
+				if localIP.Equal(net.ParseIP(addr.IP)) {
+					localNodeName = *addr.NodeName
+					return localNodeName
+				}
+			}
+		}
+	}
+	return ""
+}

middleware/kubernetes/federation_test.go

@@ -0,0 +1,104 @@
+package kubernetes
+
+import (
+	"net"
+	"strings"
+	"testing"
+
+	"github.com/coredns/coredns/middleware/etcd/msg"
+	"github.com/miekg/dns"
+	"k8s.io/client-go/1.5/pkg/api"
+)
+
+func testStripFederation(t *testing.T, k Kubernetes, input []string, expectedFed string, expectedSegs string) {
+	fed, segs := k.stripFederation(input)
+
+	if expectedSegs != strings.Join(segs, ".") {
+		t.Errorf("For '%v', expected segs result '%v'. Instead got result '%v'.", strings.Join(input, "."), expectedSegs, strings.Join(segs, "."))
+	}
+	if expectedFed != fed {
+		t.Errorf("For '%v', expected fed result '%v'. Instead got result '%v'.", strings.Join(input, "."), expectedFed, fed)
+	}
+}
+
+func TestStripFederation(t *testing.T) {
+	k := Kubernetes{Zones: []string{"inter.webs.test"}}
+	k.Federations = []Federation{{name: "fed", zone: "era.tion.com"}}
+
+	testStripFederation(t, k, []string{"service", "ns", "fed", "svc"}, "fed", "service.ns.svc")
+	testStripFederation(t, k, []string{"service", "ns", "foo", "svc"}, "", "service.ns.foo.svc")
+	testStripFederation(t, k, []string{"foo", "bar"}, "", "foo.bar")
+
+}
+
+type apiConnFedTest struct{}
+
+func (apiConnFedTest) Run()                          { return }
+func (apiConnFedTest) Stop() error                   { return nil }
+func (apiConnFedTest) ServiceList() []*api.Service   { return []*api.Service{} }
+func (apiConnFedTest) PodIndex(string) []interface{} { return nil }
+
+func (apiConnFedTest) EndpointsList() api.EndpointsList {
+	n := "test.node.foo.bar"
+	return api.EndpointsList{
+		Items: []api.Endpoints{
+			{
+				Subsets: []api.EndpointSubset{
+					{
+						Addresses: []api.EndpointAddress{
+							{
+								IP:       "10.9.8.7",
+								NodeName: &n,
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+func (apiConnFedTest) GetNodeByName(name string) (api.Node, error) {
+	if name != "test.node.foo.bar" {
+		return api.Node{}, nil
+	}
+	return api.Node{
+		ObjectMeta: api.ObjectMeta{
+			Name: "test.node.foo.bar",
+			Labels: map[string]string{
+				LabelRegion:           "fd-r",
+				LabelAvailabilityZone: "fd-az",
+			},
+		},
+	}, nil
+}
+
+func testFederationCNAMERecord(t *testing.T, k Kubernetes, input recordRequest, expected msg.Service) {
+	svc := k.federationCNAMERecord(input)
+
+	if expected.Host != svc.Host {
+		t.Errorf("For '%v', expected Host result '%v'. Instead got result '%v'.", input, expected.Host, svc.Host)
+	}
+	if expected.Key != svc.Key {
+		t.Errorf("For '%v', expected Key result '%v'. Instead got result '%v'.", input, expected.Key, svc.Key)
+	}
+}
+
+func TestFederationCNAMERecord(t *testing.T) {
+	k := Kubernetes{Zones: []string{"inter.webs"}}
+	k.Federations = []Federation{{name: "fed", zone: "era.tion.com"}}
+	k.APIConn = apiConnFedTest{}
+
+	var r recordRequest
+
+	r, _ = k.parseRequest("s1.ns.fed.svc.inter.webs", dns.TypeA)
+	localPodIP = net.ParseIP("10.9.8.7")
+	testFederationCNAMERecord(t, k, r, msg.Service{Key: "/coredns/webs/inter/svc/fed/ns/s1", Host: "s1.ns.fed.svc.fd-az.fd-r.era.tion.com"})
+
+	r, _ = k.parseRequest("ep1.s1.ns.fed.svc.inter.webs", dns.TypeA)
+	testFederationCNAMERecord(t, k, r, msg.Service{Key: "/coredns/webs/inter/svc/fed/ns/s1/ep1", Host: "ep1.s1.ns.fed.svc.fd-az.fd-r.era.tion.com"})
+
+	r, _ = k.parseRequest("ep1.s1.ns.foo.svc.inter.webs", dns.TypeA)
+	testFederationCNAMERecord(t, k, r, msg.Service{Key: "", Host: ""})
+
+}

middleware/kubernetes/kubernetes.go

@@ -39,6 +39,7 @@ type Kubernetes struct {
 	APIConn        dnsController
 	ResyncPeriod   time.Duration
 	Namespaces     []string
+	Federations    []Federation
 	LabelSelector  *unversionedapi.LabelSelector
 	Selector       *labels.Selector
 	PodMode        string
@@ -78,9 +79,18 @@ type pod struct {
 }
 
 type recordRequest struct {
-	port, protocol, endpoint, service, namespace, typeName, zone string
+	port       string
+	protocol   string
+	endpoint   string
+	service    string
+	namespace  string
+	typeName   string
+	zone       string
+	federation string
 }
 
+var localPodIP net.IP
+
 var errNoItems = errors.New("no items found")
 var errNsNotExposed = errors.New("namespace is not exposed")
 var errInvalidRequest = errors.New("invalid query name")
@@ -236,16 +246,20 @@ func (k *Kubernetes) InitKubeCache() (err error) {
 		log.Printf("[INFO] Kubernetes middleware configured with the label selector '%s'. Only kubernetes objects matching this label selector will be exposed.", unversionedapi.FormatLabelSelector(k.LabelSelector))
 	}
 
-	k.APIConn = newdnsController(kubeClient, k.ResyncPeriod, k.Selector, k.PodMode == PodModeVerified)
+	opts := dnsControlOpts{
+		initPodCache: k.PodMode == PodModeVerified,
+	}
+	k.APIConn = newdnsController(kubeClient, k.ResyncPeriod, k.Selector, opts)
 
 	return err
 }
 
 func (k *Kubernetes) parseRequest(lowerCasedName string, qtype uint16) (r recordRequest, err error) {
 	// 3 Possible cases
-	//   SRV Request: _port._protocol.service.namespace.type.zone
+	//   SRV Request: _port._protocol.service.namespace.[federation.]type.zone
-	//   A Request (endpoint): endpoint.service.namespace.type.zone
+	//   A Request (endpoint): endpoint.service.namespace.[federation.]type.zone
-	//   A Request (service): service.namespace.type.zone
+	//   A Request (service): service.namespace.[federation.]type.zone
+
 	// separate zone from rest of lowerCasedName
 	var segs []string
 	for _, z := range k.Zones {
@@ -261,6 +275,8 @@ func (k *Kubernetes) parseRequest(lowerCasedName string, qtype uint16) (r record
 		return r, errZoneNotFound
 	}
 
+	r.federation, segs = k.stripFederation(segs)
+
 	if qtype == dns.TypeNS {
 		return r, nil
 	}
@@ -339,11 +355,17 @@ func (k *Kubernetes) Records(r recordRequest) ([]msg.Service, error) {
 		return nil, err
 	}
 	if len(services) == 0 && len(pods) == 0 {
-		// Did not find item in k8s
+		// Did not find item in k8s, try federated
+		if r.federation != "" {
+			fedCNAME := k.federationCNAMERecord(r)
+			if fedCNAME.Key != "" {
+				return []msg.Service{fedCNAME}, nil
+			}
+		}
 		return nil, errNoItems
 	}
 
-	records := k.getRecordsForK8sItems(services, pods, r.zone)
+	records := k.getRecordsForK8sItems(services, pods, r)
 	return records, nil
 }
 
@@ -360,27 +382,37 @@ func endpointHostname(addr api.EndpointAddress) string {
 	return ""
 }
 
-func (k *Kubernetes) getRecordsForK8sItems(services []service, pods []pod, zone string) (records []msg.Service) {
+func (k *Kubernetes) getRecordsForK8sItems(services []service, pods []pod, r recordRequest) (records []msg.Service) {
-	zonePath := msg.Path(zone, "coredns")
+	zonePath := msg.Path(r.zone, "coredns")
 
 	for _, svc := range services {
 		if svc.addr == api.ClusterIPNone {
 			// This is a headless service, create records for each endpoint
 			for _, ep := range svc.endpoints {
 				s := msg.Service{
-					Key:  strings.Join([]string{zonePath, "svc", svc.namespace, svc.name, endpointHostname(ep.addr)}, "/"),
 					Host: ep.addr.IP,
 					Port: int(ep.port.Port),
 				}
+				if r.federation != "" {
+					s.Key = strings.Join([]string{zonePath, "svc", r.federation, svc.namespace, svc.name, endpointHostname(ep.addr)}, "/")
+				} else {
+					s.Key = strings.Join([]string{zonePath, "svc", svc.namespace, svc.name, endpointHostname(ep.addr)}, "/")
+				}
 				records = append(records, s)
 			}
 		} else {
 			// Create records for each exposed port...
 			for _, p := range svc.ports {
 				s := msg.Service{
-					Key:  strings.Join([]string{zonePath, "svc", svc.namespace, svc.name}, "/"),
 					Host: svc.addr,
 					Port: int(p.Port)}
+
+				if r.federation != "" {
+					s.Key = strings.Join([]string{zonePath, "svc", r.federation, svc.namespace, svc.name}, "/")
+				} else {
+					s.Key = strings.Join([]string{zonePath, "svc", svc.namespace, svc.name}, "/")
+				}
+
 				records = append(records, s)
 			}
 			// If the addr is not an IP (i.e. an external service), add the record ...
@@ -388,6 +420,11 @@ func (k *Kubernetes) getRecordsForK8sItems(services []service, pods []pod, zone
 				Key:  strings.Join([]string{zonePath, "svc", svc.namespace, svc.name}, "/"),
 				Host: svc.addr}
 			if t, _ := s.HostType(); t == dns.TypeCNAME {
+				if r.federation != "" {
+					s.Key = strings.Join([]string{zonePath, "svc", r.federation, svc.namespace, svc.name}, "/")
+				} else {
+					s.Key = strings.Join([]string{zonePath, "svc", svc.namespace, svc.name}, "/")
+				}
 				records = append(records, s)
 			}
 
@@ -575,3 +612,21 @@ func (k *Kubernetes) getServiceRecordForIP(ip, name string) []msg.Service {
 func symbolContainsWildcard(symbol string) bool {
 	return (symbol == "*" || symbol == "any")
 }
+
+func (k *Kubernetes) localPodIP() net.IP {
+	if localPodIP != nil {
+		return localPodIP
+	}
+	addrs, _ := k.interfaceAddrs.interfaceAddrs()
+
+	for _, addr := range addrs {
+		ip, _, _ := net.ParseCIDR(addr.String())
+		ip = ip.To4()
+		if ip == nil || ip.IsLoopback() {
+			continue
+		}
+		localPodIP = ip
+		return localPodIP
+	}
+	return nil
+}

middleware/kubernetes/kubernetes_test.go

@@ -339,6 +339,8 @@ func (APIConnServiceTest) PodIndex(string) []interface{} {
 }
 
 func (APIConnServiceTest) EndpointsList() api.EndpointsList {
+	n := "test.node.foo.bar"
+
 	return api.EndpointsList{
 		Items: []api.Endpoints{
 			{
@@ -407,13 +409,37 @@ func (APIConnServiceTest) EndpointsList() api.EndpointsList {
 					Namespace: "testns",
 				},
 			},
+			{
+				Subsets: []api.EndpointSubset{
+					{
+						Addresses: []api.EndpointAddress{
+							{
+								IP:       "10.9.8.7",
+								NodeName: &n,
+							},
+						},
+					},
+				},
+			},
 		},
 	}
 }
 
+func (APIConnServiceTest) GetNodeByName(name string) (api.Node, error) {
+	return api.Node{
+		ObjectMeta: api.ObjectMeta{
+			Name: "test.node.foo.bar",
+			Labels: map[string]string{
+				LabelRegion:           "fd-r",
+				LabelAvailabilityZone: "fd-az",
+			},
+		},
+	}, nil
+}
 func TestServices(t *testing.T) {
 
 	k := Kubernetes{Zones: []string{"interwebs.test"}}
+	k.Federations = []Federation{{name: "fed", zone: "era.tion.com"}}
 	k.APIConn = &APIConnServiceTest{}
 
 	type svcAns struct {
@@ -432,6 +458,10 @@ func TestServices(t *testing.T) {
 
 		// External Services
 		{qname: "external.testns.svc.interwebs.test.", qtype: dns.TypeCNAME, answer: svcAns{host: "coredns.io", key: "/coredns/test/interwebs/svc/testns/external"}},
+
+		// Federated Services
+		{qname: "svc1.testns.fed.svc.interwebs.test.", qtype: dns.TypeA, answer: svcAns{host: "10.0.0.1", key: "/coredns/test/interwebs/svc/fed/testns/svc1"}},
+		{qname: "svc0.testns.fed.svc.interwebs.test.", qtype: dns.TypeA, answer: svcAns{host: "svc0.testns.fed.svc.fd-az.fd-r.era.tion.com", key: "/coredns/test/interwebs/svc/fed/testns/svc0"}},
 	}
 
 	for _, test := range tests {

middleware/kubernetes/ns_test.go

@@ -104,6 +104,8 @@ func (APIConnTest) EndpointsList() api.EndpointsList {
 	}
 }
 
+func (APIConnTest) GetNodeByName(name string) (api.Node, error) { return api.Node{}, nil }
+
 type interfaceAddrsTest struct{}
 
 func (i interfaceAddrsTest) interfaceAddrs() ([]net.Addr, error) {

middleware/kubernetes/setup.go

@@ -177,6 +177,19 @@ func kubernetesParse(c *caddy.Controller) (*Kubernetes, error) {
 						return nil, err
 					}
 					k8s.Proxy = proxy.NewLookup(ups)
+				case "federation": // name zone
+					args := c.RemainingArgs()
+					if len(args) == 2 {
+						k8s.Federations = append(k8s.Federations, Federation{
+							name: args[0],
+							zone: args[1],
+						})
+						continue
+					} else {
+						return nil, fmt.Errorf("Incorrect number of arguments for federation. Got %v, expect 2.", len(args))
+					}
+					return nil, c.ArgErr()
+
 				}
 			}
 			return k8s, nil

middleware/kubernetes/setup_test.go

@@ -29,6 +29,7 @@ func TestKubernetesParse(t *testing.T) {
 		expectedCidrs         []net.IPNet
 		expectedFallthrough   bool
 		expectedUpstreams     []string
+		expectedFederations   []Federation
 	}{
 		// positive
 		{
@@ -44,6 +45,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"kubernetes keyword with multiple zones",
@@ -58,6 +60,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"kubernetes keyword with zone and empty braces",
@@ -73,6 +76,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"endpoint keyword with url",
@@ -89,6 +93,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"namespaces keyword with one namespace",
@@ -105,6 +110,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			nil,
 		},
 		{
 			"namespaces keyword with multiple namespaces",
@@ -121,6 +127,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"resync period in seconds",
@@ -137,6 +144,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"resync period in minutes",
@@ -153,6 +161,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"basic label selector",
@@ -169,6 +178,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"multi-label selector",
@@ -185,6 +195,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"fully specified valid config",
@@ -205,6 +216,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			true,
 			nil,
+			[]Federation{},
 		},
 		// negative
 		{
@@ -220,6 +232,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"kubernetes keyword without a zone",
@@ -234,6 +247,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"endpoint keyword without an endpoint value",
@@ -250,6 +264,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"namespace keyword without a namespace value",
@@ -266,6 +281,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"resyncperiod keyword without a duration value",
@@ -282,6 +298,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"resync period no units",
@@ -298,6 +315,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"resync period invalid",
@@ -314,6 +332,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"labels with no selector value",
@@ -330,6 +349,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		{
 			"labels with invalid selector value",
@@ -346,6 +366,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		// pods disabled
 		{
@@ -363,6 +384,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		// pods insecure
 		{
@@ -380,6 +402,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		// pods verified
 		{
@@ -397,6 +420,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		// pods invalid
 		{
@@ -414,6 +438,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		// cidrs ok
 		{
@@ -431,6 +456,7 @@ func TestKubernetesParse(t *testing.T) {
 			[]net.IPNet{parseCidr("10.0.0.0/24"), parseCidr("10.0.1.0/24")},
 			false,
 			nil,
+			[]Federation{},
 		},
 		// cidrs ok
 		{
@@ -448,6 +474,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		// fallthrough invalid
 		{
@@ -465,6 +492,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
 		},
 		// Valid upstream
 		{
@@ -482,6 +510,7 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			[]string{"13.14.15.16:53"},
+			[]Federation{},
 		},
 		// Invalid upstream
 		{
@@ -499,6 +528,47 @@ func TestKubernetesParse(t *testing.T) {
 			nil,
 			false,
 			nil,
+			[]Federation{},
+		},
+		// Valid federations
+		{
+			"valid upstream",
+			`kubernetes coredns.local {
+	federation foo bar.crawl.com
+	federation fed era.tion.com
+}`,
+			false,
+			"",
+			1,
+			0,
+			defaultResyncPeriod,
+			"",
+			defaultPodMode,
+			nil,
+			false,
+			nil,
+			[]Federation{
+				{name: "foo", zone: "bar.crawl.com"},
+				{name: "fed", zone: "era.tion.com"},
+			},
+		},
+		// Invalid federations
+		{
+			"valid upstream",
+			`kubernetes coredns.local {
+	federation starship
+}`,
+			true,
+			`Incorrect number of arguments for federation. Got 1, expect 2.`,
+			-1,
+			0,
+			defaultResyncPeriod,
+			"",
+			defaultPodMode,
+			nil,
+			false,
+			nil,
+			[]Federation{},
 		},
 	}