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coredns/test/kubernetes_test.go
Miek Gieben 7e56cc74e5 WIP: Parserequest2 cutback (#868) 
* middleware/kubernetes: pull TXT out of parseRequest

Put the TXT handling one layer higher and remove it from parseRequest.
Also rename the podsvc field in there to podOrSvc. Now that it isn't
used anymore for TXT record (dns-version) that was put in there. We can
make this a boolean (in a future PR).

Make parseRequest get an optional Zone that is from state.Zone and use
that instead of its own code. Removed some tests and other smaller
cleanups.

Fixes #836

* add this reverse

* another check

* readd

* Rename to kPod and kService for some clarity
2017-08-10 01:08:58 -07:00

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// +build k8s
package test
import (
"os"
"testing"
"time"
"github.com/coredns/coredns/middleware/test"
"github.com/mholt/caddy"
"github.com/miekg/dns"
)
// Test data
// TODO: Fix the actual RR values
var dnsTestCases = []test.Case{
{
Qname: "svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-1-a.test-1.svc.cluster.local. 303 IN A 10.0.0.100"),
},
},
{
Qname: "bogusservice.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "bogusendpoint.svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "bogusendpoint.headless-svc.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "svc-1-a.*.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-1-a.test-1.svc.cluster.local. 303 IN A 10.0.0.100"),
},
},
{
Qname: "svc-1-a.any.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-1-a.test-1.svc.cluster.local. 303 IN A 10.0.0.100"),
},
},
{
Qname: "bogusservice.*.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "bogusservice.any.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "*.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-1-a.test-1.svc.cluster.local. 303 IN A 10.0.0.100"),
test.A("svc-1-b.test-1.svc.cluster.local. 303 IN A 10.0.0.110"),
test.A("svc-c.test-1.svc.cluster.local. 303 IN A 10.0.0.115"),
test.A("headless-svc.test-1.svc.cluster.local. 303 IN A 172.17.0.5"),
test.A("headless-svc.test-1.svc.cluster.local. 303 IN A 172.17.0.6"),
test.CNAME("ext-svc.test-1.svc.cluster.local. 0 IN CNAME example.net."),
test.A("example.net. 68974 IN A 13.14.15.16"),
},
},
{
Qname: "any.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-1-a.test-1.svc.cluster.local. 303 IN A 10.0.0.100"),
test.A("svc-1-b.test-1.svc.cluster.local. 303 IN A 10.0.0.110"),
test.A("svc-c.test-1.svc.cluster.local. 303 IN A 10.0.0.115"),
test.A("headless-svc.test-1.svc.cluster.local. 303 IN A 172.17.0.5"),
test.A("headless-svc.test-1.svc.cluster.local. 303 IN A 172.17.0.6"),
test.CNAME("ext-svc.test-1.svc.cluster.local. 0 IN CNAME example.net."),
test.A("example.net. 68974 IN A 13.14.15.16"),
},
},
{
Qname: "any.test-2.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "*.test-2.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "*.*.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-1-a.test-1.svc.cluster.local. 303 IN A 10.0.0.100"),
test.A("svc-1-b.test-1.svc.cluster.local. 303 IN A 10.0.0.110"),
test.A("svc-c.test-1.svc.cluster.local. 303 IN A 10.0.0.115"),
test.A("headless-svc.test-1.svc.cluster.local. 303 IN A 172.17.0.5"),
test.A("headless-svc.test-1.svc.cluster.local. 303 IN A 172.17.0.6"),
test.CNAME("ext-svc.test-1.svc.cluster.local. 0 IN CNAME example.net."),
test.A("example.net. 68974 IN A 13.14.15.16"),
},
},
{
Qname: "headless-svc.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("headless-svc.test-1.svc.cluster.local. 303 IN A 172.17.0.5"),
test.A("headless-svc.test-1.svc.cluster.local. 303 IN A 172.17.0.6"),
},
},
{
Qname: "*._TcP.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: "*.any.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: "ANY.*.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._UDP.*.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: "10-20-0-101.test-1.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeServerFailure,
Answer: []dns.RR{},
},
{
Qname: "123.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{},
},
{
Qname: "100.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("100.0.0.10.in-addr.arpa. 303 IN PTR svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "115.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("115.0.0.10.in-addr.arpa. 303 IN PTR svc-c.test-1.svc.cluster.local."),
},
},
{
Qname: "dns-version.cluster.local.", Qtype: dns.TypeTXT,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.TXT("dns-version.cluster.local. 28800 IN TXT \"1.0.0\""),
},
},
{
Qname: "next-in-chain.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("next-in-chain. 0 IN A 192.0.2.53"),
},
},
{
Qname: "cluster.local.", Qtype: dns.TypeNS,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.NS("cluster.local. 0 IN NS kubernetes.default.svc.cluster.local."),
},
},
{
Qname: "ext-svc.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("ext-svc.test-1.svc.cluster.local. 0 IN CNAME example.net."),
test.A("example.net. 72031 IN A 13.14.15.16"),
},
},
{
Qname: "ext-svc.test-1.svc.cluster.local.", Qtype: dns.TypeCNAME,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("ext-svc.test-1.svc.cluster.local. 0 IN CNAME example.net."),
},
},
}
var dnsTestCasesPodsInsecure = []test.Case{
{
Qname: "10-20-0-101.test-1.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("10-20-0-101.test-1.pod.cluster.local. 0 IN A 10.20.0.101"),
},
},
{
Qname: "10-20-0-101.test-X.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
}
var dnsTestCasesPodsVerified = []test.Case{
{
Qname: "10-20-0-101.test-1.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "10-20-0-101.test-X.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
}
var dnsTestCasesCidrReverseZone = []test.Case{
{
Qname: "123.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{},
},
{
Qname: "100.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("100.0.0.10.in-addr.arpa. 303 IN PTR svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "110.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("115.0.0.10.in-addr.arpa. 303 IN PTR svc-1-b.test-1.svc.cluster.local."),
},
},
{
Qname: "115.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("115.0.0.10.in-addr.arpa. 303 IN PTR svc-c.test-1.svc.cluster.local."),
},
},
{
Qname: "next-in-chain.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("next-in-chain. 0 IN A 192.0.2.53"),
},
},
}
var dnsTestCasesPartialCidrReverseZone = []test.Case{
{
// In exposed range, record not present = OK + No data
Qname: "99.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{},
},
{
// In exposed range, record present = OK + Data
Qname: "100.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("100.0.0.10.in-addr.arpa. 303 IN PTR svc-1-a.test-1.svc.cluster.local."),
},
},
{
// In exposed range, record present = OK + Data
Qname: "110.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("115.0.0.10.in-addr.arpa. 303 IN PTR svc-1-b.test-1.svc.cluster.local."),
},
},
{
// Out of exposed range, record present = pass to next middleware (not existing in test) = FAIL
Qname: "115.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeServerFailure,
Answer: []dns.RR{},
},
{
Qname: "next-in-chain.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("next-in-chain. 0 IN A 192.0.2.53"),
},
},
}
var dnsTestCasesAllNSExposed = []test.Case{
{
Qname: "svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-1-a.test-1.svc.cluster.local. 303 IN A 10.0.0.100"),
},
},
{
Qname: "svc-c.test-2.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc-c.test-1.svc.cluster.local. 303 IN A 10.0.0.120"),
},
},
{
Qname: "123.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{},
},
{
Qname: "100.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("100.0.0.10.in-addr.arpa. 303 IN PTR svc-1-a.test-1.svc.cluster.local."),
},
},
{
Qname: "120.0.0.10.in-addr.arpa.", Qtype: dns.TypePTR,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.PTR("120.0.0.10.in-addr.arpa. 303 IN PTR svc-c.test-2.svc.cluster.local."),
},
},
}
var dnsTestCasesFallthrough = []test.Case{
{
Qname: "f.b.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("f.b.svc.cluster.local. 303 IN A 10.10.10.11"),
},
},
{
Qname: "foo.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("foo.cluster.local. 303 IN A 10.10.10.10"),
},
},
}
func createTestServer(t *testing.T, corefile string) (*caddy.Instance, string) {
server, err := CoreDNSServer(corefile)
if err != nil {
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
}
udp, _ := CoreDNSServerPorts(server, 0)
if udp == "" {
t.Fatalf("Could not get UDP listening port")
}
return server, udp
}
func doIntegrationTests(t *testing.T, corefile string, testCases []test.Case) {
server, udp := createTestServer(t, corefile)
defer server.Stop()
// Work-around for timing condition that results in no-data being returned in
// test environment.
time.Sleep(1 * time.Second)
for _, tc := range testCases {
dnsClient := new(dns.Client)
dnsMessage := new(dns.Msg)
dnsMessage.SetQuestion(tc.Qname, tc.Qtype)
res, _, err := dnsClient.Exchange(dnsMessage, udp)
if err != nil {
t.Fatalf("Could not send query: %s", err)
}
// check the answer
if res.Rcode != tc.Rcode {
t.Errorf("Expected rcode %d but got %d for query %s, %d", tc.Rcode, res.Rcode, tc.Qname, tc.Qtype)
}
if len(res.Answer) != len(tc.Answer) {
t.Errorf("Expected %d answers but got %d for query %s, %d", len(tc.Answer), len(res.Answer), tc.Qname, tc.Qtype)
}
//TODO: Check the actual RR values
}
}
func createUpstreamServer(t *testing.T) (func(), *caddy.Instance, string) {
upfile, rmfile, err := TempFile(os.TempDir(), exampleNet)
if err != nil {
t.Fatalf("Could not create file for CNAME upstream lookups: %s", err)
}
upstreamServerCorefile := `.:0 {
file ` + upfile + ` example.net
erratic . {
drop 0
}
`
server, udp := createTestServer(t, upstreamServerCorefile)
return rmfile, server, udp
}
func TestKubernetesIntegration(t *testing.T) {
removeUpstreamConfig, upstreamServer, udp := createUpstreamServer(t)
defer upstreamServer.Stop()
defer removeUpstreamConfig()
corefile :=
`.:0 {
kubernetes cluster.local 0.0.10.in-addr.arpa {
endpoint http://localhost:8080
namespaces test-1
pods disabled
upstream ` + udp + `
}
erratic . {
drop 0
}
`
doIntegrationTests(t, corefile, dnsTestCases)
}
func TestKubernetesIntegrationPodsInsecure(t *testing.T) {
corefile :=
`.:0 {
kubernetes cluster.local 0.0.10.in-addr.arpa {
endpoint http://localhost:8080
namespaces test-1
pods insecure
}
`
doIntegrationTests(t, corefile, dnsTestCasesPodsInsecure)
}
func TestKubernetesIntegrationPodsVerified(t *testing.T) {
corefile :=
`.:0 {
kubernetes cluster.local 0.0.10.in-addr.arpa {
endpoint http://localhost:8080
namespaces test-1
pods verified
}
`
doIntegrationTests(t, corefile, dnsTestCasesPodsVerified)
}
func TestKubernetesIntegrationCidrReverseZone(t *testing.T) {
corefile :=
`.:0 {
kubernetes cluster.local {
endpoint http://localhost:8080
namespaces test-1
cidrs 10.0.0.0/24
}
erratic . {
drop 0
}
`
doIntegrationTests(t, corefile, dnsTestCasesCidrReverseZone)
}
func TestKubernetesIntegrationPartialCidrReverseZone(t *testing.T) {
corefile :=
`.:0 {
kubernetes cluster.local {
endpoint http://localhost:8080
namespaces test-1
cidrs 10.0.0.96/28 10.0.0.120/32
}
erratic . {
drop 0
}
`
doIntegrationTests(t, corefile, dnsTestCasesPartialCidrReverseZone)
}
func TestKubernetesIntegrationAllNSExposed(t *testing.T) {
corefile :=
`.:0 {
kubernetes cluster.local {
endpoint http://localhost:8080
cidrs 10.0.0.0/24
}
`
doIntegrationTests(t, corefile, dnsTestCasesAllNSExposed)
}
func TestKubernetesIntegrationFallthrough(t *testing.T) {
dbfile, rmFunc, err := TempFile(os.TempDir(), clusterLocal)
if err != nil {
t.Fatalf("Could not create TempFile for fallthrough: %s", err)
}
defer rmFunc()
removeUpstreamConfig, upstreamServer, udp := createUpstreamServer(t)
defer upstreamServer.Stop()
defer removeUpstreamConfig()
corefile :=
`.:0 {
file ` + dbfile + ` cluster.local
kubernetes cluster.local {
endpoint http://localhost:8080
cidrs 10.0.0.0/24
namespaces test-1
upstream ` + udp + `
fallthrough
}
erratic {
drop 0
}
`
cases := append(dnsTestCases, dnsTestCasesFallthrough...)
doIntegrationTests(t, corefile, cases)
}
const clusterLocal = `; cluster.local test file for fallthrough
cluster.local. IN SOA sns.dns.icann.org. noc.dns.icann.org. 2015082541 7200 3600 1209600 3600
cluster.local. IN NS b.iana-servers.net.
cluster.local. IN NS a.iana-servers.net.
cluster.local. IN A 127.0.0.1
cluster.local. IN A 127.0.0.2
foo.cluster.local. IN A 10.10.10.10
f.b.svc.cluster.local. IN A 10.10.10.11
*.w.cluster.local. IN TXT "Wildcard"
a.b.svc.cluster.local. IN TXT "Not a wildcard"
cname.cluster.local. IN CNAME www.example.net.
service.namespace.svc.cluster.local. IN SRV 8080 10 10 cluster.local.
`
const exampleNet = `; example.net. test file for cname tests
example.net. IN SOA ns.example.net. admin.example.net. 2015082541 7200 3600 1209600 3600
example.net. IN A 13.14.15.16
`
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