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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(3 * 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 TestKubernetesIntegrationAPIProxy(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://nonexistance:8080,http://invalidip:8080,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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