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plugin/kubernetes: Add support for dual stack ClusterIP Services (#4339)

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* support dual stack clusterIPs

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* stickler

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* fix ClusterIPs make

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
This commit is contained in:
Chris O'Haver 2020-12-21 05:30:24 -05:00 • committed by GitHub
parent 302434e392
commit 51c05679e6
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
14 changed files with 204 additions and 111 deletions
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4
plugin/k8s_external/external_test.go
View file

@ -190,7 +190,7 @@ var svcIndexExternal = map[string][]*object.Service{
Name: "svc1",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: "10.0.0.1",
ClusterIPs: []string{"10.0.0.1"},
ExternalIPs: []string{"1.2.3.4"},
Ports: []api.ServicePort{{Name: "http", Protocol: "tcp", Port: 80}},
},
@ -200,7 +200,7 @@ var svcIndexExternal = map[string][]*object.Service{
Name: "svc6",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: "10.0.0.3",
ClusterIPs: []string{"10.0.0.3"},
ExternalIPs: []string{"1:2::5"},
Ports: []api.ServicePort{{Name: "http", Protocol: "tcp", Port: 80}},
},

8
plugin/kubernetes/controller.go
View file

@ -200,11 +200,13 @@ func svcIPIndexFunc(obj interface{}) ([]string, error) {
if !ok {
return nil, errObj
}
idx := make([]string, len(svc.ClusterIPs)+len(svc.ExternalIPs))
copy(idx, svc.ClusterIPs)
if len(svc.ExternalIPs) == 0 {
return []string{svc.ClusterIP}, nil
return idx, nil
}
return append([]string{svc.ClusterIP}, svc.ExternalIPs...), nil
copy(idx[len(svc.ClusterIPs):], svc.ExternalIPs)
return idx, nil
}
func svcNameNamespaceIndexFunc(obj interface{}) ([]string, error) {

4
plugin/kubernetes/external_test.go
View file

@ -105,7 +105,7 @@ var svcIndexExternal = map[string][]*object.Service{
Name: "svc1",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: "10.0.0.1",
ClusterIPs: []string{"10.0.0.1"},
ExternalIPs: []string{"1.2.3.4"},
Ports: []api.ServicePort{{Name: "http", Protocol: "tcp", Port: 80}},
},
@ -115,7 +115,7 @@ var svcIndexExternal = map[string][]*object.Service{
Name: "svc6",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: "10.0.0.3",
ClusterIPs: []string{"10.0.0.3"},
ExternalIPs: []string{"1:2::5"},
Ports: []api.ServicePort{{Name: "http", Protocol: "tcp", Port: 80}},
},

46
plugin/kubernetes/handler_test.go
View file

@ -372,6 +372,30 @@ var dnsTestCases = []test.Case{
test.SOA("cluster.local. 5 IN SOA ns.dns.cluster.local. hostmaster.cluster.local. 1499347823 7200 1800 86400 5"),
},
},
// Dual Stack ClusterIP Services
{
Qname: "svc-dual-stack.testns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-dual-stack.testns.svc.cluster.local. 5 IN A 10.0.0.3"),
},
},
{
Qname: "svc-dual-stack.testns.svc.cluster.local.", Qtype: dns.TypeAAAA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.AAAA("svc-dual-stack.testns.svc.cluster.local. 5 IN AAAA 10::3"),
},
},
{
Qname: "svc-dual-stack.testns.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{test.SRV("svc-dual-stack.testns.svc.cluster.local. 5 IN SRV 0 50 80 svc-dual-stack.testns.svc.cluster.local.")},
Extra: []dns.RR{
test.A("svc-dual-stack.testns.svc.cluster.local. 5 IN A 10.0.0.3"),
test.AAAA("svc-dual-stack.testns.svc.cluster.local. 5 IN AAAA 10::3"),
},
},
}
func TestServeDNS(t *testing.T) {
@ -542,7 +566,7 @@ var svcIndex = map[string][]*object.Service{
Name: "svc1",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: "10.0.0.1",
ClusterIPs: []string{"10.0.0.1"},
Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
@ -553,7 +577,7 @@ var svcIndex = map[string][]*object.Service{
Name: "svcempty",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: "10.0.0.1",
ClusterIPs: []string{"10.0.0.1"},
Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
@ -564,7 +588,7 @@ var svcIndex = map[string][]*object.Service{
Name: "svc6",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: "1234:abcd::1",
ClusterIPs: []string{"1234:abcd::1"},
Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
@ -575,7 +599,7 @@ var svcIndex = map[string][]*object.Service{
Name: "hdls1",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: api.ClusterIPNone,
ClusterIPs: []string{api.ClusterIPNone},
},
},
"external.testns": {
@ -605,7 +629,7 @@ var svcIndex = map[string][]*object.Service{
Name: "hdlsprtls",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIP: api.ClusterIPNone,
ClusterIPs: []string{api.ClusterIPNone},
},
},
"svc1.unexposedns": {
@ -613,12 +637,22 @@ var svcIndex = map[string][]*object.Service{
Name: "svc1",
Namespace: "unexposedns",
Type: api.ServiceTypeClusterIP,
ClusterIP: "10.0.0.2",
ClusterIPs: []string{"10.0.0.2"},
Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
},
},
"svc-dual-stack.testns": {
{
Name: "svc-dual-stack",
Namespace: "testns",
Type: api.ServiceTypeClusterIP,
ClusterIPs: []string{"10.0.0.3", "10::3"}, Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
},
},
}
func (APIConnServeTest) SvcIndex(s string) []*object.Service { return svcIndex[s] }

21
plugin/kubernetes/informer_test.go
View file

@ -1,6 +1,7 @@
package kubernetes
import (
"fmt"
"testing"
"github.com/coredns/coredns/plugin/kubernetes/object"
@ -21,11 +22,19 @@ func TestDefaultProcessor(t *testing.T) {
func testProcessor(t *testing.T, processor cache.ProcessFunc, idx cache.Indexer) {
obj := &api.Service{
ObjectMeta: metav1.ObjectMeta{Name: "service1", Namespace: "test1"},
Spec: api.ServiceSpec{ClusterIP: "1.2.3.4", Ports: []api.ServicePort{{Port: 80}}},
Spec: api.ServiceSpec{
ClusterIP: "1.2.3.4",
ClusterIPs: []string{"1.2.3.4"},
Ports: []api.ServicePort{{Port: 80}},
},
}
obj2 := &api.Service{
ObjectMeta: metav1.ObjectMeta{Name: "service2", Namespace: "test1"},
Spec: api.ServiceSpec{ClusterIP: "5.6.7.8", Ports: []api.ServicePort{{Port: 80}}},
Spec: api.ServiceSpec{
ClusterIP: "5.6.7.8",
ClusterIPs: []string{"5.6.7.8"},
Ports: []api.ServicePort{{Port: 80}},
},
}
// Add the objects
@ -47,8 +56,8 @@ func testProcessor(t *testing.T, processor cache.ProcessFunc, idx cache.Indexer)
if !ok {
t.Fatal("object in index was incorrect type")
}
if svc.ClusterIP != obj.Spec.ClusterIP {
t.Fatalf("expected %v, got %v", obj.Spec.ClusterIP, svc.ClusterIP)
if fmt.Sprintf("%v", svc.ClusterIPs) != fmt.Sprintf("%v", obj.Spec.ClusterIPs) {
t.Fatalf("expected '%v', got '%v'", obj.Spec.ClusterIPs, svc.ClusterIPs)
}
// Update an object
@ -71,8 +80,8 @@ func testProcessor(t *testing.T, processor cache.ProcessFunc, idx cache.Indexer)
if !ok {
t.Fatal("object in index was incorrect type")
}
if svc.ClusterIP != obj.Spec.ClusterIP {
t.Fatalf("expected %v, got %v", obj.Spec.ClusterIP, svc.ClusterIP)
if fmt.Sprintf("%v", svc.ClusterIPs) != fmt.Sprintf("%v", obj.Spec.ClusterIPs) {
t.Fatalf("expected '%v', got '%v'", obj.Spec.ClusterIPs, svc.ClusterIPs)
}
// Delete an object

34
plugin/kubernetes/kubernetes.go
View file

@ -433,8 +433,7 @@ func (k *Kubernetes) findServices(r recordRequest, zone string) (services []msg.
// If "ignore empty_service" option is set and no endpoints exist, return NXDOMAIN unless
// it's a headless or externalName service (covered below).
if k.opts.ignoreEmptyService && svc.ClusterIP != api.ClusterIPNone && svc.Type != api.ServiceTypeExternalName {
// serve NXDOMAIN if no endpoint is able to answer
if k.opts.ignoreEmptyService && svc.Type != api.ServiceTypeExternalName && !svc.Headless() { // serve NXDOMAIN if no endpoint is able to answer
podsCount := 0
for _, ep := range endpointsListFunc() {
for _, eps := range ep.Subsets {
@ -447,8 +446,20 @@ func (k *Kubernetes) findServices(r recordRequest, zone string) (services []msg.
}
}
// External service
if svc.Type == api.ServiceTypeExternalName {
s := msg.Service{Key: strings.Join([]string{zonePath, Svc, svc.Namespace, svc.Name}, "/"), Host: svc.ExternalName, TTL: k.ttl}
if t, _ := s.HostType(); t == dns.TypeCNAME {
s.Key = strings.Join([]string{zonePath, Svc, svc.Namespace, svc.Name}, "/")
services = append(services, s)
err = nil
}
continue
}
// Endpoint query or headless service
if svc.ClusterIP == api.ClusterIPNone || r.endpoint != "" {
if svc.Headless() || r.endpoint != "" {
if endpointsList == nil {
endpointsList = endpointsListFunc()
}
@ -485,18 +496,6 @@ func (k *Kubernetes) findServices(r recordRequest, zone string) (services []msg.
continue
}
// External service
if svc.Type == api.ServiceTypeExternalName {
s := msg.Service{Key: strings.Join([]string{zonePath, Svc, svc.Namespace, svc.Name}, "/"), Host: svc.ExternalName, TTL: k.ttl}
if t, _ := s.HostType(); t == dns.TypeCNAME {
s.Key = strings.Join([]string{zonePath, Svc, svc.Namespace, svc.Name}, "/")
services = append(services, s)
err = nil
}
continue
}
// ClusterIP service
for _, p := range svc.Ports {
if !(match(r.port, p.Name) && match(r.protocol, string(p.Protocol))) {
@ -505,12 +504,13 @@ func (k *Kubernetes) findServices(r recordRequest, zone string) (services []msg.
err = nil
s := msg.Service{Host: svc.ClusterIP, Port: int(p.Port), TTL: k.ttl}
for _, ip := range svc.ClusterIPs {
s := msg.Service{Host: ip, Port: int(p.Port), TTL: k.ttl}
s.Key = strings.Join([]string{zonePath, Svc, svc.Namespace, svc.Name}, "/")
services = append(services, s)
}
}
}
return services, err
}

60
plugin/kubernetes/kubernetes_test.go
View file

@ -73,7 +73,15 @@ func (APIConnServiceTest) SvcIndex(string) []*object.Service {
{
Name: "svc1",
Namespace: "testns",
ClusterIP: "10.0.0.1",
ClusterIPs: []string{"10.0.0.1"},
Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
},
{
Name: "svc-dual-stack",
Namespace: "testns",
ClusterIPs: []string{"10.0.0.2", "10::2"},
Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
@ -81,7 +89,7 @@ func (APIConnServiceTest) SvcIndex(string) []*object.Service {
{
Name: "hdls1",
Namespace: "testns",
ClusterIP: api.ClusterIPNone,
ClusterIPs: []string{api.ClusterIPNone},
},
{
Name: "external",
@ -101,7 +109,15 @@ func (APIConnServiceTest) ServiceList() []*object.Service {
{
Name: "svc1",
Namespace: "testns",
ClusterIP: "10.0.0.1",
ClusterIPs: []string{"10.0.0.1"},
Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
},
{
Name: "svc-dual-stack",
Namespace: "testns",
ClusterIPs: []string{"10.0.0.2", "10::2"},
Ports: []api.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
@ -109,7 +125,7 @@ func (APIConnServiceTest) ServiceList() []*object.Service {
{
Name: "hdls1",
Namespace: "testns",
ClusterIP: api.ClusterIPNone,
ClusterIPs: []string{api.ClusterIPNone},
},
{
Name: "external",
@ -256,19 +272,29 @@ func TestServices(t *testing.T) {
type svcTest struct {
qname string
qtype uint16
answer svcAns
answer []svcAns
}
tests := []svcTest{
// Cluster IP Services
{qname: "svc1.testns.svc.interwebs.test.", qtype: dns.TypeA, answer: svcAns{host: "10.0.0.1", key: "/" + coredns + "/test/interwebs/svc/testns/svc1"}},
{qname: "_http._tcp.svc1.testns.svc.interwebs.test.", qtype: dns.TypeSRV, answer: svcAns{host: "10.0.0.1", key: "/" + coredns + "/test/interwebs/svc/testns/svc1"}},
{qname: "ep1a.svc1.testns.svc.interwebs.test.", qtype: dns.TypeA, answer: svcAns{host: "172.0.0.1", key: "/" + coredns + "/test/interwebs/svc/testns/svc1/ep1a"}},
{qname: "svc1.testns.svc.interwebs.test.", qtype: dns.TypeA, answer: []svcAns{{host: "10.0.0.1", key: "/" + coredns + "/test/interwebs/svc/testns/svc1"}}},
{qname: "_http._tcp.svc1.testns.svc.interwebs.test.", qtype: dns.TypeSRV, answer: []svcAns{{host: "10.0.0.1", key: "/" + coredns + "/test/interwebs/svc/testns/svc1"}}},
{qname: "ep1a.svc1.testns.svc.interwebs.test.", qtype: dns.TypeA, answer: []svcAns{{host: "172.0.0.1", key: "/" + coredns + "/test/interwebs/svc/testns/svc1/ep1a"}}},
// Dual-Stack Cluster IP Service
{
qname: "_http._tcp.svc-dual-stack.testns.svc.interwebs.test.",
qtype: dns.TypeSRV,
answer: []svcAns{
{host: "10.0.0.2", key: "/" + coredns + "/test/interwebs/svc/testns/svc-dual-stack"},
{host: "10::2", key: "/" + coredns + "/test/interwebs/svc/testns/svc-dual-stack"},
},
},
// External Services
{qname: "external.testns.svc.interwebs.test.", qtype: dns.TypeCNAME, answer: svcAns{host: "coredns.io", key: "/" + coredns + "/test/interwebs/svc/testns/external"}},
{qname: "external.testns.svc.interwebs.test.", qtype: dns.TypeCNAME, answer: []svcAns{{host: "coredns.io", key: "/" + coredns + "/test/interwebs/svc/testns/external"}}},
// Headless Services
{qname: "hdls1.testns.svc.interwebs.test.", qtype: dns.TypeA, answer: svcAns{host: "172.0.0.2", key: "/" + coredns + "/test/interwebs/svc/testns/hdls1/172-0-0-2"}},
{qname: "hdls1.testns.svc.interwebs.test.", qtype: dns.TypeA, answer: []svcAns{{host: "172.0.0.2", key: "/" + coredns + "/test/interwebs/svc/testns/hdls1/172-0-0-2"}}},
}
for i, test := range tests {
@ -281,16 +307,18 @@ func TestServices(t *testing.T) {
t.Errorf("Test %d: got error '%v'", i, e)
continue
}
if len(svcs) != 1 {
t.Errorf("Test %d, expected 1 answer, got %v", i, len(svcs))
if len(svcs) != len(test.answer) {
t.Errorf("Test %d, expected %v answer, got %v", i, len(test.answer), len(svcs))
continue
}
if test.answer.host != svcs[0].Host {
t.Errorf("Test %d, expected host '%v', got '%v'", i, test.answer.host, svcs[0].Host)
for j := range svcs {
if test.answer[j].host != svcs[j].Host {
t.Errorf("Test %d, expected host '%v', got '%v'", i, test.answer[j].host, svcs[j].Host)
}
if test.answer[j].key != svcs[j].Key {
t.Errorf("Test %d, expected key '%v', got '%v'", i, test.answer[j].key, svcs[j].Key)
}
if test.answer.key != svcs[0].Key {
t.Errorf("Test %d, expected key '%v', got '%v'", i, test.answer.key, svcs[0].Key)
}
}
}

7
plugin/kubernetes/ns.go
View file

@ -5,7 +5,6 @@ import (
"strings"
"github.com/miekg/dns"
api "k8s.io/api/core/v1"
)
func isDefaultNS(name, zone string) bool {
@ -37,7 +36,7 @@ func (k *Kubernetes) nsAddrs(external bool, zone string) []dns.RR {
continue
}
svcName := strings.Join([]string{svc.Name, svc.Namespace, Svc, zone}, ".")
if svc.ClusterIP == api.ClusterIPNone {
if svc.Headless() {
// For a headless service, use the endpoints IPs
for _, s := range endpoint.Subsets {
for _, a := range s.Addresses {
@ -46,8 +45,10 @@ func (k *Kubernetes) nsAddrs(external bool, zone string) []dns.RR {
}
}
} else {
for _, clusterIP := range svc.ClusterIPs {
svcNames = append(svcNames, svcName)
svcIPs = append(svcIPs, net.ParseIP(svc.ClusterIP))
svcIPs = append(svcIPs, net.ParseIP(clusterIP))
}
}
}
}

6
plugin/kubernetes/ns_test.go
View file

@ -39,17 +39,17 @@ func (APIConnTest) ServiceList() []*object.Service {
{
Name: "dns-service",
Namespace: "kube-system",
ClusterIP: "10.0.0.111",
ClusterIPs: []string{"10.0.0.111"},
},
{
Name: "hdls-dns-service",
Namespace: "kube-system",
ClusterIP: api.ClusterIPNone,
ClusterIPs: []string{api.ClusterIPNone},
},
{
Name: "dns6-service",
Namespace: "kube-system",
ClusterIP: "10::111",
ClusterIPs: []string{"10::111"},
},
}
return svcs

2
plugin/kubernetes/object/metrics.go
View file

@ -67,7 +67,7 @@ func (l *EndpointLatencyRecorder) record() {
// don't change very often (comparing to much more frequent endpoints changes), cases when this method
// will return wrong answer should be relatively rare. Because of that we intentionally accept this
// flaw to keep the solution simple.
isHeadless := len(l.Services) == 1 && l.Services[0].ClusterIP == api.ClusterIPNone
isHeadless := len(l.Services) == 1 && l.Services[0].Headless()
if !isHeadless || l.TT.IsZero() {
return

18
plugin/kubernetes/object/service.go
View file

@ -15,7 +15,7 @@ type Service struct {
Name string
Namespace string
Index string
ClusterIP string
ClusterIPs []string
Type api.ServiceType
ExternalName string
Ports []api.ServicePort
@ -40,13 +40,19 @@ func ToService(obj meta.Object) (meta.Object, error) {
Name: svc.GetName(),
Namespace: svc.GetNamespace(),
Index: ServiceKey(svc.GetName(), svc.GetNamespace()),
ClusterIP: svc.Spec.ClusterIP,
Type: svc.Spec.Type,
ExternalName: svc.Spec.ExternalName,
ExternalIPs: make([]string, len(svc.Status.LoadBalancer.Ingress)+len(svc.Spec.ExternalIPs)),
}
if len(svc.Spec.ClusterIPs) > 0 {
s.ClusterIPs = make([]string, len(svc.Spec.ClusterIPs))
copy(s.ClusterIPs, svc.Spec.ClusterIPs)
} else {
s.ClusterIPs = []string{svc.Spec.ClusterIP}
}
if len(svc.Spec.Ports) == 0 {
// Add sentinel if there are no ports.
s.Ports = []api.ServicePort{{Port: -1}}
@ -70,6 +76,11 @@ func ToService(obj meta.Object) (meta.Object, error) {
return s, nil
}
// Headless returns true if the service is headless
func (s *Service) Headless() bool {
return s.ClusterIPs[0] == api.ClusterIPNone
}
var _ runtime.Object = &Service{}
// DeepCopyObject implements the ObjectKind interface.
@ -79,12 +90,13 @@ func (s *Service) DeepCopyObject() runtime.Object {
Name: s.Name,
Namespace: s.Namespace,
Index: s.Index,
ClusterIP: s.ClusterIP,
Type: s.Type,
ExternalName: s.ExternalName,
ClusterIPs: make([]string, len(s.ClusterIPs)),
Ports: make([]api.ServicePort, len(s.Ports)),
ExternalIPs: make([]string, len(s.ExternalIPs)),
}
copy(s1.ClusterIPs, s.ClusterIPs)
copy(s1.Ports, s.Ports)
copy(s1.ExternalIPs, s.ExternalIPs)
return s1

4
plugin/kubernetes/reverse_test.go
View file

@ -32,7 +32,7 @@ func (APIConnReverseTest) SvcIndex(svc string) []*object.Service {
{
Name: "svc1",
Namespace: "testns",
ClusterIP: "192.168.1.100",
ClusterIPs: []string{"192.168.1.100"},
Ports: []api.ServicePort{{Name: "http", Protocol: "tcp", Port: 80}},
},
}
@ -48,7 +48,7 @@ func (APIConnReverseTest) SvcIndexReverse(ip string) []*object.Service {
{
Name: "svc1",
Namespace: "testns",
ClusterIP: "192.168.1.100",
ClusterIPs: []string{"192.168.1.100"},
Ports: []api.ServicePort{{Name: "http", Protocol: "tcp", Port: 80}},
},
}

9
plugin/kubernetes/xfr.go
View file

@ -50,13 +50,16 @@ func (k *Kubernetes) Transfer(zone string, serial uint32) (<-chan []dns.RR, erro
switch svc.Type {
case api.ServiceTypeClusterIP, api.ServiceTypeNodePort, api.ServiceTypeLoadBalancer:
clusterIP := net.ParseIP(svc.ClusterIP)
clusterIP := net.ParseIP(svc.ClusterIPs[0])
if clusterIP != nil {
s := msg.Service{Host: svc.ClusterIP, TTL: k.ttl}
var host string
for _, ip := range svc.ClusterIPs {
s := msg.Service{Host: ip, TTL: k.ttl}
s.Key = strings.Join(svcBase, "/")
// Change host from IP to Name for SRV records
host := emitAddressRecord(ch, s)
host = emitAddressRecord(ch, s)
}
for _, p := range svc.Ports {
s := msg.Service{Host: host, Port: int(p.Port), TTL: k.ttl}

4
plugin/kubernetes/xfr_test.go
View file

@ -113,6 +113,10 @@ hdls1.testns.svc.cluster.local. 5 IN AAAA 5678:abcd::2
_http._tcp.hdls1.testns.svc.cluster.local. 5 IN SRV 0 16 80 5678-abcd--2.hdls1.testns.svc.cluster.local.
hdlsprtls.testns.svc.cluster.local. 5 IN A 172.0.0.20
172-0-0-20.hdlsprtls.testns.svc.cluster.local. 5 IN A 172.0.0.20
svc-dual-stack.testns.svc.cluster.local. 5 IN A 10.0.0.3
svc-dual-stack.testns.svc.cluster.local. 5 IN AAAA 10::3
svc-dual-stack.testns.svc.cluster.local. 5 IN SRV 0 100 80 svc-dual-stack.testns.svc.cluster.local.
_http._tcp.svc-dual-stack.testns.svc.cluster.local. 5 IN SRV 0 100 80 svc-dual-stack.testns.svc.cluster.local.
svc1.testns.svc.cluster.local. 5 IN A 10.0.0.1
svc1.testns.svc.cluster.local. 5 IN SRV 0 100 80 svc1.testns.svc.cluster.local.
_http._tcp.svc1.testns.svc.cluster.local. 5 IN SRV 0 100 80 svc1.testns.svc.cluster.local.