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handle A/PTR/SRV for headless services/endpoints (#464)

Browse Source 
* handle A/PTR/SRV for headless services/endpoints

* error early if _proto will produce nothing

* remove wc params + various style tweaks

* Release 004

* handle A/PTR/SRV for headless services/endpoints

* error early if _proto will produce nothing

* remove wc params + various style tweaks

* optimize srv prefix validation

* poking travis

* reduce response sizes, clean func params
This commit is contained in:
Chris O'Haver
2017-01-05 10:09:59 -05:00
committed by Miek Gieben
parent 39af7e4076
commit 9a5e0c64fd
2 changed files with 286 additions and 132 deletions
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245
middleware/kubernetes/kubernetes.go
View File

@@ -5,7 +5,6 @@ import (
"errors"
"fmt"
"log"
"strconv"
"strings"
"time"
@@ -45,11 +44,28 @@ type Kubernetes struct {
Selector *labels.Selector
}
type endpoint struct {
addr api.EndpointAddress
port api.EndpointPort
}
type service struct {
name string
namespace string
addr string
ports []api.ServicePort
endpoints []endpoint
}
var errNoItems = errors.New("no items found")
var errNsNotExposed = errors.New("namespace is not exposed")
var errInvalidRequest = errors.New("invalid query name")
// Services implements the ServiceBackend interface.
func (k *Kubernetes) Services(state request.Request, exact bool, opt middleware.Options) ([]msg.Service, []msg.Service, error) {
if state.Type() == "SRV" && !ValidSRV(state.Name()) {
return nil, nil, errInvalidRequest
}
s, e := k.Records(state.Name(), exact)
return s, nil, e // Haven't implemented debug queries yet.
}
@@ -77,7 +93,7 @@ func (k *Kubernetes) Lookup(state request.Request, name string, typ uint16) (*dn
// IsNameError implements the ServiceBackend interface.
func (k *Kubernetes) IsNameError(err error) bool {
return err == errNoItems || err == errNsNotExposed
return err == errNoItems || err == errNsNotExposed || err == errInvalidRequest
}
// Debug implements the ServiceBackend interface.
@@ -171,6 +187,23 @@ func (k *Kubernetes) getZoneForName(name string) (string, []string) {
return zone, serviceSegments
}
// stripSRVPrefix separates out the port and protocol segments, if present
// If not present, assume all ports/protocols (e.g. wildcard)
func stripSRVPrefix(name []string) (string, string, []string) {
if name[0][0] == '_' && name[1][0] == '_' {
return name[0][1:], name[1][1:], name[2:]
}
// no srv prefix present
return "*", "*", name
}
func stripEndpointName(name []string) (endpoint string, nameOut []string) {
if len(name) == 4 {
return strings.ToLower(name[0]), name[1:]
}
return "", name
}
// Records looks up services in kubernetes. If exact is true, it will lookup
// just this name. This is used when find matches when completing SRV lookups
// for instance.
@@ -182,6 +215,8 @@ func (k *Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
)
zone, serviceSegments := k.getZoneForName(name)
port, protocol, serviceSegments := stripSRVPrefix(serviceSegments)
endpointname, serviceSegments := stripEndpointName(serviceSegments)
if len(serviceSegments) < 3 {
return nil, errNoItems
}
@@ -205,16 +240,13 @@ func (k *Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
serviceName = "*"
}
nsWildcard := symbolContainsWildcard(namespace)
serviceWildcard := symbolContainsWildcard(serviceName)
// Abort if the namespace does not contain a wildcard, and namespace is not published per CoreFile
// Case where namespace contains a wildcard is handled in Get(...) method.
if (!nsWildcard) && (len(k.Namespaces) > 0) && (!dnsstrings.StringInSlice(namespace, k.Namespaces)) {
if (!symbolContainsWildcard(namespace)) && (len(k.Namespaces) > 0) && (!dnsstrings.StringInSlice(namespace, k.Namespaces)) {
return nil, errNsNotExposed
}
k8sItems, err := k.Get(namespace, nsWildcard, serviceName, serviceWildcard, typeName)
k8sItems, err := k.Get(namespace, serviceName, endpointname, port, protocol, typeName)
if err != nil {
return nil, err
}
@@ -227,40 +259,41 @@ func (k *Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
return records, nil
}
func (k *Kubernetes) getRecordsForServiceItems(serviceItems []*api.Service, zone string) []msg.Service {
func endpointHostname(addr api.EndpointAddress) string {
if addr.Hostname != "" {
return strings.ToLower(addr.Hostname)
}
if strings.Contains(addr.IP, ".") {
return strings.Replace(addr.IP, ".", "-", -1)
}
if strings.Contains(addr.IP, ":") {
return strings.ToLower(strings.Replace(addr.IP, ":", "-", -1))
}
return ""
}
func (k *Kubernetes) getRecordsForServiceItems(serviceItems []service, zone string) []msg.Service {
var records []msg.Service
for _, item := range serviceItems {
for _, svc := range serviceItems {
key := k.NameTemplate.RecordNameFromNameValues(nametemplate.NameValues{TypeName: "svc", ServiceName: item.ObjectMeta.Name, Namespace: item.ObjectMeta.Namespace, Zone: zone})
key := svc.name + "." + svc.namespace + ".svc." + zone
key = strings.Replace(key, ".", "/", -1)
clusterIP := item.Spec.ClusterIP
if clusterIP == api.ClusterIPNone {
// This is a headless service, create records for each pod
epList, _ := k.APIConn.epLister.List()
for _, ep := range epList.Items {
if ep.ObjectMeta.Name == item.ObjectMeta.Name && ep.ObjectMeta.Namespace == item.ObjectMeta.Namespace {
for _, eps := range ep.Subsets {
for i, port := range eps.Ports {
for j, addr := range eps.Addresses {
refid := strconv.Itoa(j*1024 + i)
if svc.addr == api.ClusterIPNone {
// This is a headless service, create records for each endpoint
for _, ep := range svc.endpoints {
ephostname := endpointHostname(ep.addr)
s := msg.Service{
Key: msg.Path(strings.ToLower(refid+"._"+port.Name+"._"+string(port.Protocol)+"."+key), "coredns"),
Host: addr.IP, Port: int(port.Port),
Key: msg.Path(strings.ToLower(ephostname+"."+key), "coredns"),
Host: ep.addr.IP, Port: int(ep.port.Port),
}
records = append(records, s)
}
}
}
}
}
} else {
// Create records for each exposed port...
for _, p := range item.Spec.Ports {
s := msg.Service{Key: msg.Path(strings.ToLower("_"+p.Name+"._"+string(p.Protocol)+"."+key), "coredns"), Host: clusterIP, Port: int(p.Port)}
for _, p := range svc.ports {
s := msg.Service{Key: msg.Path(strings.ToLower(key), "coredns"), Host: svc.addr, Port: int(p.Port)}
records = append(records, s)
}
}
@@ -270,36 +303,75 @@ func (k *Kubernetes) getRecordsForServiceItems(serviceItems []*api.Service, zone
}
// Get performs the call to the Kubernetes http API.
func (k *Kubernetes) Get(namespace string, nsWildcard bool, servicename string, serviceWildcard bool, typeName string) ([]*api.Service, error) {
func (k *Kubernetes) Get(namespace, servicename, endpointname, port, protocol, typeName string) (services []service, err error) {
switch {
case typeName == "pod":
return nil, fmt.Errorf("pod not implemented")
return nil, fmt.Errorf("%v not implemented", typeName)
default:
return k.getServices(namespace, nsWildcard, servicename, serviceWildcard)
return k.getServices(namespace, servicename, endpointname, port, protocol)
}
}
func (k *Kubernetes) getServices(namespace string, nsWildcard bool, servicename string, serviceWildcard bool) ([]*api.Service, error) {
func (k *Kubernetes) getServices(namespace, servicename, endpointname, port, protocol string) ([]service, error) {
serviceList := k.APIConn.ServiceList()
var resultItems []*api.Service
var resultItems []service
for _, item := range serviceList {
if symbolMatches(namespace, item.Namespace, nsWildcard) && symbolMatches(servicename, item.Name, serviceWildcard) {
// If namespace has a wildcard, filter results against Corefile namespace list.
// (Namespaces without a wildcard were filtered before the call to this function.)
if nsWildcard && (len(k.Namespaces) > 0) && (!dnsstrings.StringInSlice(item.Namespace, k.Namespaces)) {
nsWildcard := symbolContainsWildcard(namespace)
serviceWildcard := symbolContainsWildcard(servicename)
portWildcard := symbolContainsWildcard(port)
protocolWildcard := symbolContainsWildcard(protocol)
for _, svc := range serviceList {
if !(symbolMatches(namespace, svc.Namespace, nsWildcard) && symbolMatches(servicename, svc.Name, serviceWildcard)) {
continue
}
resultItems = append(resultItems, item)
// If namespace has a wildcard, filter results against Corefile namespace list.
// (Namespaces without a wildcard were filtered before the call to this function.)
if nsWildcard && (len(k.Namespaces) > 0) && (!dnsstrings.StringInSlice(svc.Namespace, k.Namespaces)) {
continue
}
s := service{name: svc.Name, namespace: svc.Namespace, addr: svc.Spec.ClusterIP}
if s.addr != api.ClusterIPNone {
for _, p := range svc.Spec.Ports {
if !(symbolMatches(port, strings.ToLower(p.Name), portWildcard) && symbolMatches(protocol, strings.ToLower(string(p.Protocol)), protocolWildcard)) {
continue
}
s.ports = append(s.ports, p)
}
resultItems = append(resultItems, s)
continue
}
// Headless service
endpointsList, err := k.APIConn.epLister.List()
if err != nil {
continue
}
for _, ep := range endpointsList.Items {
if ep.ObjectMeta.Name != svc.Name || ep.ObjectMeta.Namespace != svc.Namespace {
continue
}
for _, eps := range ep.Subsets {
for _, addr := range eps.Addresses {
for _, p := range eps.Ports {
ephostname := endpointHostname(addr)
if endpointname != "" && endpointname != ephostname {
continue
}
if !(symbolMatches(port, strings.ToLower(p.Name), portWildcard) && symbolMatches(protocol, strings.ToLower(string(p.Protocol)), protocolWildcard)) {
continue
}
s.endpoints = append(s.endpoints, endpoint{addr: addr, port: p})
}
}
}
}
resultItems = append(resultItems, s)
}
return resultItems, nil
}
func symbolMatches(queryString string, candidateString string, wildcard bool) bool {
func symbolMatches(queryString, candidateString string, wildcard bool) bool {
result := false
switch {
case !wildcard:
@@ -312,18 +384,41 @@ func symbolMatches(queryString string, candidateString string, wildcard bool) bo
return result
}
// getServiceRecordForIP: Gets a service record with a cluster ip matching the ip argument
// If a service cluster ip does not match, it checks all endpoints
func (k *Kubernetes) getServiceRecordForIP(ip, name string) []msg.Service {
// First check services with cluster ips
svcList, err := k.APIConn.svcLister.List(labels.Everything())
if err != nil {
return nil
}
for _, service := range svcList {
if !dnsstrings.StringInSlice(service.Namespace, k.Namespaces) {
continue
}
if service.Spec.ClusterIP == ip {
name := k.NameTemplate.RecordNameFromNameValues(nametemplate.NameValues{TypeName: "svc", ServiceName: service.ObjectMeta.Name, Namespace: service.ObjectMeta.Namespace, Zone: k.PrimaryZone()})
return []msg.Service{msg.Service{Host: name}}
domain := service.Name + "." + service.Namespace + ".svc." + k.PrimaryZone()
return []msg.Service{msg.Service{Host: domain}}
}
}
// If no cluster ips match, search endpoints
epList, err := k.APIConn.epLister.List()
if err != nil {
return nil
}
for _, ep := range epList.Items {
if !dnsstrings.StringInSlice(ep.ObjectMeta.Namespace, k.Namespaces) {
continue
}
for _, eps := range ep.Subsets {
for _, addr := range eps.Addresses {
if addr.IP == ip {
domain := endpointHostname(addr) + "." + ep.ObjectMeta.Name + "." + ep.ObjectMeta.Namespace + ".svc." + k.PrimaryZone()
return []msg.Service{msg.Service{Host: domain}}
}
}
}
}
return nil
}
@@ -331,3 +426,57 @@ func (k *Kubernetes) getServiceRecordForIP(ip, name string) []msg.Service {
func symbolContainsWildcard(symbol string) bool {
return (strings.Contains(symbol, "*") || (symbol == "any"))
}
// ValidSRV parses a server record validating _port._proto. prefix labels.
// The valid schema is:
// * Fist two segments must start with an "_",
// * Second segment must be one of _tcp|_udp|_*|_any
func ValidSRV(name string) bool {
// Does it start with a "_" ?
if len(name) > 0 && name[0] != '_' {
return false
}
// First label
first, end := dns.NextLabel(name, 0)
if end {
return false
}
// Second label
off, end := dns.NextLabel(name, first)
if end {
return false
}
// first:off has captured _tcp. or _udp. (if present)
second := name[first:off]
if len(second) > 0 && second[0] != '_' {
return false
}
// A bit convoluted to avoid strings.ToLower
if len(second) == 5 {
// matches _tcp
if (second[1] == 't' || second[1] == 'T') && (second[2] == 'c' || second[2] == 'C') &&
(second[3] == 'p' || second[3] == 'P') {
return true
}
// matches _udp
if (second[1] == 'u' || second[1] == 'U') && (second[2] == 'd' || second[2] == 'D') &&
(second[3] == 'p' || second[3] == 'P') {
return true
}
// matches _any
if (second[1] == 'a' || second[1] == 'A') && (second[2] == 'n' || second[2] == 'N') &&
(second[3] == 'y' || second[3] == 'Y') {
return true
}
}
// matches _*
if len(second) == 3 && second[1] == '*' {
return true
}
return false
}

165
test/kubernetes_test.go
View File

@@ -104,91 +104,96 @@ var dnsTestCases = []test.Case{
},
},
//TODO: Fix below to all use test.SRV not test.A!
{
Qname: "_*._*.svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "_*._*.bogusservice.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "_*._*.svc-1-a.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "_*._*.svc-1-a.any.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "_*._*.bogusservice.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "_*._*.bogusservice.any.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "_c-port._*.*.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_c-port._udp.svc-c.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 svc-c.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.headless-svc.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 172-17-0-5.headless-svc.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.headless-svc.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 172-17-0-6.headless-svc.test-1.svc.cluster.local."),
},
},
{
Qname: "_*._tcp.any.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_http._tcp.svc-1-b.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-b.test-1.svc.cluster.local."),
},
},
{
Qname: "_*._*.any.test-2.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "_*._*.*.test-2.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "_http._tcp.*.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_http._tcp.svc-1-b.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-b.test-1.svc.cluster.local."),
},
},
{
Qname: "_*.svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "_*._not-udp-or-tcp.svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "bogusservice.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "svc-1-a.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "svc-1-a.any.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "bogusservice.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "bogusservice.any.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "*.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_http._tcp.svc-1-b.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-b.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.svc-c.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 svc-c.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.headless-svc.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 headless-svc.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.headless-svc.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 headless-svc.test-1.svc.cluster.local."),
},
},
{
Qname: "any.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_http._tcp.svc-1-b.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-b.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.svc-c.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 svc-c.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.headless-svc.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 headless-svc.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.headless-svc.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 headless-svc.test-1.svc.cluster.local."),
},
},
{
Qname: "any.test-2.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "*.test-2.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "*.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_https._tcp.svc-1-a.test-1.svc.cluster.local. 303 IN SRV 10 100 443 svc-1-a.test-1.svc.cluster.local."),
test.SRV("_http._tcp.svc-1-b.test-1.svc.cluster.local. 303 IN SRV 10 100 80 svc-1-b.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.svc-c.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 svc-c.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.headless-svc.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 headless-svc.test-1.svc.cluster.local."),
test.SRV("_c-port._udp.headless-svc.test-1.svc.cluster.local. 303 IN SRV 10 100 1234 headless-svc.test-1.svc.cluster.local."),
},
},
{
Qname: "123.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,