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Merge pull request #62832 from grayluck/externalname-test

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Automatic merge from submit-queue (batch tested with PRs 62885, 62832). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

e2e test forwarding externalname dns lookup to upstream nameservers.

**What this PR does / why we need it**:
e2e test forwarding externalname dns lookup to upstream nameservers.

e2e test that goes through dnsmasq -> kubedns -> upstream servers path.

Updated e2e test for PTR record lookup, test for default upstreamservers from resolv.conf.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes https://github.com/kubernetes/dns/issues/226

**Special notes for your reviewer**:
/assign @MrHohn 

**Release note**:

```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2018-04-19 18:40:10 -07:00 committed by GitHub
commit e85943f9a2
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1 changed files with 82 additions and 7 deletions
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89
test/e2e/network/dns_configmap.go
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@ -22,6 +22,7 @@ import (
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/kubernetes/test/e2e/framework"
. "github.com/onsi/ginkgo"
)
@ -33,6 +34,13 @@ type dnsFederationsConfigMapTest struct {
isValid bool
}
var (
googleDnsHostname = "google-public-dns-a.google.com"
// The ConfigMap update mechanism takes longer than the standard
// wait.ForeverTestTimeout.
moreForeverTestTimeout = 2 * 60 * time.Second
)
var _ = SIGDescribe("DNS configMap federations", func() {
t := &dnsNameserverTest{dnsTestCommon: newDnsTestCommon()}
@ -156,10 +164,6 @@ func (t *dnsNameserverTest) run() {
"upstreamNameservers": fmt.Sprintf(`["%v"]`, t.dnsServerPod.Status.PodIP),
}})
// The ConfigMap update mechanism takes longer than the standard
// wait.ForeverTestTimeout.
moreForeverTestTimeout := 2 * 60 * time.Second
t.checkDNSRecordFrom(
"abc.acme.local",
func(actual []string) bool { return len(actual) == 1 && actual[0] == "1.1.1.1" },
@ -199,19 +203,24 @@ func (t *dnsPtrFwdTest) run() {
t.createDNSServerWithPtrRecord()
defer t.deleteDNSServerPod()
// Should still be able to lookup public nameserver without explicit upstream nameserver set.
t.checkDNSRecordFrom(
"8.8.8.8.in-addr.arpa",
func(actual []string) bool { return len(actual) == 1 && actual[0] == googleDnsHostname+"." },
"dnsmasq",
moreForeverTestTimeout)
t.setConfigMap(&v1.ConfigMap{Data: map[string]string{
"upstreamNameservers": fmt.Sprintf(`["%v"]`, t.dnsServerPod.Status.PodIP),
}})
moreForeverTestTimeout := 2 * 60 * time.Second
t.checkDNSRecordFrom(
"123.2.0.192.in-addr.arpa",
func(actual []string) bool { return len(actual) == 1 && actual[0] == "my.test." },
"dnsmasq",
moreForeverTestTimeout)
t.c.CoreV1().ConfigMaps(t.ns).Delete(t.name, nil)
t.setConfigMap(&v1.ConfigMap{Data: map[string]string{}})
t.checkDNSRecordFrom(
"123.2.0.192.in-addr.arpa",
func(actual []string) bool { return len(actual) == 0 },
@ -219,6 +228,63 @@ func (t *dnsPtrFwdTest) run() {
moreForeverTestTimeout)
}
type dnsExternalNameTest struct {
dnsTestCommon
}
func (t *dnsExternalNameTest) run() {
t.init()
t.createUtilPod()
defer t.deleteUtilPod()
fooHostname := "foo.example.com"
t.createDNSServer(map[string]string{
fooHostname: "192.0.2.123",
})
defer t.deleteDNSServerPod()
f := t.f
serviceName := "dns-externalname-upstream-test"
externalNameService := framework.CreateServiceSpec(serviceName, googleDnsHostname, false, nil)
if _, err := f.ClientSet.CoreV1().Services(f.Namespace.Name).Create(externalNameService); err != nil {
Fail(fmt.Sprintf("Failed when creating service: %v", err))
}
serviceNameLocal := "dns-externalname-upstream-local"
externalNameServiceLocal := framework.CreateServiceSpec(serviceNameLocal, fooHostname, false, nil)
if _, err := f.ClientSet.CoreV1().Services(f.Namespace.Name).Create(externalNameServiceLocal); err != nil {
Fail(fmt.Sprintf("Failed when creating service: %v", err))
}
defer func() {
By("deleting the test externalName service")
defer GinkgoRecover()
f.ClientSet.CoreV1().Services(f.Namespace.Name).Delete(externalNameService.Name, nil)
f.ClientSet.CoreV1().Services(f.Namespace.Name).Delete(externalNameServiceLocal.Name, nil)
}()
t.checkDNSRecordFrom(
fmt.Sprintf("%s.%s.svc.cluster.local", serviceName, f.Namespace.Name),
func(actual []string) bool {
return len(actual) >= 1 && actual[0] == googleDnsHostname+"."
},
"dnsmasq",
moreForeverTestTimeout)
t.setConfigMap(&v1.ConfigMap{Data: map[string]string{
"upstreamNameservers": fmt.Sprintf(`["%v"]`, t.dnsServerPod.Status.PodIP),
}})
t.checkDNSRecordFrom(
fmt.Sprintf("%s.%s.svc.cluster.local", serviceNameLocal, f.Namespace.Name),
func(actual []string) bool {
return len(actual) == 2 && actual[0] == fooHostname+"." && actual[1] == "192.0.2.123"
},
"dnsmasq",
moreForeverTestTimeout)
t.setConfigMap(&v1.ConfigMap{Data: map[string]string{}})
}
var _ = SIGDescribe("DNS configMap nameserver", func() {
Context("Change stubDomain", func() {
@ -238,4 +304,13 @@ var _ = SIGDescribe("DNS configMap nameserver", func() {
fwdTest.run()
})
})
Context("Forward external name lookup", func() {
externalNameTest := &dnsExternalNameTest{dnsTestCommon: newDnsTestCommon()}
It("should forward externalname lookup to upstream nameserver [Slow][Serial]", func() {
externalNameTest.c = externalNameTest.f.ClientSet
externalNameTest.run()
})
})
})