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Configure DNS based on the kube-system:kube-dns ConfigMap

Browse Source 
Updates the dnsmasq cache/mux layer to be managed by dnsmasq-nanny.
dnsmasq-nanny manages dnsmasq based on values from the
kube-system:kube-dns configmap:

"stubDomains": {
	"acme.local": ["1.2.3.4"]
},

is a map of domain to list of nameservers for the domain. This is used
to inject private DNS domains into the kube-dns namespace. In the above
example, any DNS requests for *.acme.local will be served by the
nameserver 1.2.3.4.

"upstreamNameservers": ["8.8.8.8", "8.8.4.4"]

is a list of upstreamNameservers to use, overriding the configuration
specified in /etc/resolv.conf.
This commit is contained in:
Bowei Du
2017-02-17 14:44:03 -08:00
parent 77733c2afd
commit 4fe2e82d88
7 changed files with 407 additions and 208 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
cluster/addons/dns/kubedns-controller.yaml.base
View File

@@ -53,7 +53,7 @@ spec:
optional: true
containers:
- name: kubedns
image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.1
resources:
# TODO: Set memory limits when we've profiled the container for large
# clusters, then set request = limit to keep this container in
@@ -105,7 +105,7 @@ spec:
- name: kube-dns-config
mountPath: /kube-dns-config
- name: dnsmasq
image: gcr.io/google_containers/k8s-dns-dnsmasq-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.1
livenessProbe:
httpGet:
path: /healthcheck/dnsmasq
@@ -116,11 +116,17 @@ spec:
successThreshold: 1
failureThreshold: 5
args:
- -v=2
- -logtostderr
- -configDir=/etc/k8s/dns/dnsmasq-nanny
- -restartDnsmasq=true
- --
- -k
- --cache-size=1000
- --log-facility=-
- --server=/__PILLAR__DNS__DOMAIN__/127.0.0.1#10053
- --server=/in-addr.arpa/127.0.0.1#10053
- --server=/ip6.arpa/127.0.0.1#10053
- --log-facility=-
ports:
- containerPort: 53
name: dns
@@ -132,9 +138,12 @@ spec:
resources:
requests:
cpu: 150m
memory: 10Mi
memory: 20Mi
volumeMounts:
- name: kube-dns-config
mountPath: /etc/k8s/dns/dnsmasq-nanny
- name: sidecar
image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.1
livenessProbe:
httpGet:
path: /metrics

19
cluster/addons/dns/kubedns-controller.yaml.in
View File

@@ -53,7 +53,7 @@ spec:
optional: true
containers:
- name: kubedns
image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.1
resources:
# TODO: Set memory limits when we've profiled the container for large
# clusters, then set request = limit to keep this container in
@@ -105,7 +105,7 @@ spec:
- name: kube-dns-config
mountPath: /kube-dns-config
- name: dnsmasq
image: gcr.io/google_containers/k8s-dns-dnsmasq-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.1
livenessProbe:
httpGet:
path: /healthcheck/dnsmasq
@@ -116,11 +116,17 @@ spec:
successThreshold: 1
failureThreshold: 5
args:
- -v=2
- -logtostderr
- -configDir=/etc/k8s/dns/dnsmasq-nanny
- -restartDnsmasq=true
- --
- -k
- --cache-size=1000
- --log-facility=-
- --server=/{{ pillar['dns_domain'] }}/127.0.0.1#10053
- --server=/in-addr.arpa/127.0.0.1#10053
- --server=/ip6.arpa/127.0.0.1#10053
- --log-facility=-
ports:
- containerPort: 53
name: dns
@@ -132,9 +138,12 @@ spec:
resources:
requests:
cpu: 150m
memory: 10Mi
memory: 20Mi
volumeMounts:
- name: kube-dns-config
mountPath: /etc/k8s/dns/dnsmasq-nanny
- name: sidecar
image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.1
livenessProbe:
httpGet:
path: /metrics

19
cluster/addons/dns/kubedns-controller.yaml.sed
View File

@@ -53,7 +53,7 @@ spec:
optional: true
containers:
- name: kubedns
image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.1
resources:
# TODO: Set memory limits when we've profiled the container for large
# clusters, then set request = limit to keep this container in
@@ -104,7 +104,7 @@ spec:
- name: kube-dns-config
mountPath: /kube-dns-config
- name: dnsmasq
image: gcr.io/google_containers/k8s-dns-dnsmasq-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.1
livenessProbe:
httpGet:
path: /healthcheck/dnsmasq
@@ -115,11 +115,17 @@ spec:
successThreshold: 1
failureThreshold: 5
args:
- -v=2
- -logtostderr
- -configDir=/etc/k8s/dns/dnsmasq-nanny
- -restartDnsmasq=true
- --
- -k
- --cache-size=1000
- --log-facility=-
- --server=/$DNS_DOMAIN/127.0.0.1#10053
- --server=/in-addr.arpa/127.0.0.1#10053
- --server=/ip6.arpa/127.0.0.1#10053
- --log-facility=-
ports:
- containerPort: 53
name: dns
@@ -131,9 +137,12 @@ spec:
resources:
requests:
cpu: 150m
memory: 10Mi
memory: 20Mi
volumeMounts:
- name: kube-dns-config
mountPath: /etc/k8s/dns/dnsmasq-nanny
- name: sidecar
image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.13.0
image: gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.1
livenessProbe:
httpGet:
path: /metrics

17
cmd/kubeadm/app/phases/addons/manifests.go
View File

@@ -89,7 +89,7 @@ spec:
name: kube-proxy
`
KubeDNSVersion = "1.13.0"
KubeDNSVersion = "1.14.1"
KubeDNSDeployment = `
@@ -179,7 +179,7 @@ spec:
- name: kube-dns-config
mountPath: /kube-dns-config
- name: dnsmasq
image: {{ .ImageRepository }}/k8s-dns-dnsmasq-{{ .Arch }}:{{ .Version }}
image: {{ .ImageRepository }}/k8s-dns-dnsmasq-nanny-{{ .Arch }}:{{ .Version }}
imagePullPolicy: IfNotPresent
livenessProbe:
httpGet:
@@ -191,11 +191,17 @@ spec:
successThreshold: 1
failureThreshold: 5
args:
- -v=2
- -logtostderr
- -configDir=/etc/k8s/dns/dnsmasq-nanny
- -restartDnsmasq=true
- --
- -k
- --cache-size=1000
- --log-facility=-
- --server=/{{ .DNSDomain }}/127.0.0.1#10053
- --server=/in-addr.arpa/127.0.0.1#10053
- --server=/ip6.arpa/127.0.0.1#10053
- --log-facility=-
ports:
- containerPort: 53
name: dns
@@ -207,7 +213,10 @@ spec:
resources:
requests:
cpu: 150m
memory: 10Mi
memory: 20Mi
volumeMounts:
- name: kube-dns-config
mountPath: /etc/k8s/dns/dnsmasq-nanny
- name: sidecar
image: {{ .ImageRepository }}/k8s-dns-sidecar-{{ .Arch }}:{{ .Version }}
imagePullPolicy: IfNotPresent

1
test/e2e/BUILD
View File

@@ -31,6 +31,7 @@ go_library(
"disruption.go",
"dns.go",
"dns_autoscaling.go",
"dns_common.go",
"dns_configmap.go",
"e2e.go",
"empty.go",

281
test/e2e/dns_common.go Normal file
View File

@@ -0,0 +1,281 @@
/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package e2e
import (
"fmt"
"strings"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/kubernetes/pkg/api/v1"
"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
"k8s.io/kubernetes/test/e2e/framework"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
type dnsTestCommon struct {
f *framework.Framework
c clientset.Interface
ns string
name string
labels []string
dnsPod *v1.Pod
utilPod *v1.Pod
utilService *v1.Service
dnsServerPod *v1.Pod
cm *v1.ConfigMap
}
func newDnsTestCommon() dnsTestCommon {
return dnsTestCommon{
f: framework.NewDefaultFramework("dns-config-map"),
ns: "kube-system",
name: "kube-dns",
}
}
func (t *dnsTestCommon) init() {
By("Finding a DNS pod")
label := labels.SelectorFromSet(labels.Set(map[string]string{"k8s-app": "kube-dns"}))
options := metav1.ListOptions{LabelSelector: label.String()}
pods, err := t.f.ClientSet.Core().Pods("kube-system").List(options)
Expect(err).NotTo(HaveOccurred())
Expect(len(pods.Items)).Should(BeNumerically(">=", 1))
t.dnsPod = &pods.Items[0]
framework.Logf("Using DNS pod: %v", t.dnsPod.Name)
}
func (t *dnsTestCommon) checkDNSRecord(name string, predicate func([]string) bool, timeout time.Duration) {
t.checkDNSRecordFrom(name, predicate, "kube-dns", timeout)
}
func (t *dnsTestCommon) checkDNSRecordFrom(name string, predicate func([]string) bool, target string, timeout time.Duration) {
var actual []string
err := wait.PollImmediate(
time.Duration(1)*time.Second,
timeout,
func() (bool, error) {
actual = t.runDig(name, target)
if predicate(actual) {
return true, nil
}
return false, nil
})
if err != nil {
framework.Failf("dig result did not match: %#v after %v",
actual, timeout)
}
}
// runDig queries for `dnsName`. Returns a list of responses.
func (t *dnsTestCommon) runDig(dnsName, target string) []string {
cmd := []string{"/usr/bin/dig", "+short"}
switch target {
case "kube-dns":
cmd = append(cmd, "@"+t.dnsPod.Status.PodIP, "-p", "10053")
case "dnsmasq":
break
default:
panic(fmt.Errorf("invalid target: " + target))
}
cmd = append(cmd, dnsName)
stdout, stderr, err := t.f.ExecWithOptions(framework.ExecOptions{
Command: cmd,
Namespace: t.f.Namespace.Name,
PodName: t.utilPod.Name,
ContainerName: "util",
CaptureStdout: true,
CaptureStderr: true,
})
framework.Logf("Running dig: %v, stdout: %q, stderr: %q, err: %v",
cmd, stdout, stderr, err)
if stdout == "" {
return []string{}
} else {
return strings.Split(stdout, "\n")
}
}
func (t *dnsTestCommon) setConfigMap(cm *v1.ConfigMap) {
if t.cm != nil {
t.cm = cm
}
cm.ObjectMeta.Namespace = t.ns
cm.ObjectMeta.Name = t.name
options := metav1.ListOptions{
FieldSelector: fields.Set{
"metadata.namespace": t.ns,
"metadata.name": t.name,
}.AsSelector().String(),
}
cmList, err := t.c.Core().ConfigMaps(t.ns).List(options)
Expect(err).NotTo(HaveOccurred())
if len(cmList.Items) == 0 {
By(fmt.Sprintf("Creating the ConfigMap (%s:%s) %+v", t.ns, t.name, *cm))
_, err := t.c.Core().ConfigMaps(t.ns).Create(cm)
Expect(err).NotTo(HaveOccurred())
} else {
By(fmt.Sprintf("Updating the ConfigMap (%s:%s) to %+v", t.ns, t.name, *cm))
_, err := t.c.Core().ConfigMaps(t.ns).Update(cm)
Expect(err).NotTo(HaveOccurred())
}
}
func (t *dnsTestCommon) deleteConfigMap() {
By(fmt.Sprintf("Deleting the ConfigMap (%s:%s)", t.ns, t.name))
t.cm = nil
err := t.c.Core().ConfigMaps(t.ns).Delete(t.name, nil)
Expect(err).NotTo(HaveOccurred())
}
func (t *dnsTestCommon) createUtilPod() {
// Actual port # doesn't matter, just needs to exist.
const servicePort = 10101
t.utilPod = &v1.Pod{
TypeMeta: metav1.TypeMeta{
Kind: "Pod",
},
ObjectMeta: metav1.ObjectMeta{
Namespace: t.f.Namespace.Name,
Labels: map[string]string{"app": "e2e-dns-configmap"},
GenerateName: "e2e-dns-configmap-",
},
Spec: v1.PodSpec{
Containers: []v1.Container{
{
Name: "util",
Image: "gcr.io/google_containers/dnsutils:e2e",
Command: []string{"sleep", "10000"},
Ports: []v1.ContainerPort{
{ContainerPort: servicePort, Protocol: "TCP"},
},
},
},
},
}
var err error
t.utilPod, err = t.c.Core().Pods(t.f.Namespace.Name).Create(t.utilPod)
Expect(err).NotTo(HaveOccurred())
framework.Logf("Created pod %v", t.utilPod)
Expect(t.f.WaitForPodRunning(t.utilPod.Name)).NotTo(HaveOccurred())
t.utilService = &v1.Service{
TypeMeta: metav1.TypeMeta{
Kind: "Service",
},
ObjectMeta: metav1.ObjectMeta{
Namespace: t.f.Namespace.Name,
Name: "e2e-dns-configmap",
},
Spec: v1.ServiceSpec{
Selector: map[string]string{"app": "e2e-dns-configmap"},
Ports: []v1.ServicePort{
{
Protocol: "TCP",
Port: servicePort,
TargetPort: intstr.FromInt(servicePort),
},
},
},
}
t.utilService, err = t.c.Core().Services(t.f.Namespace.Name).Create(t.utilService)
Expect(err).NotTo(HaveOccurred())
framework.Logf("Created service %v", t.utilService)
}
func (t *dnsTestCommon) deleteUtilPod() {
podClient := t.c.Core().Pods(t.f.Namespace.Name)
if err := podClient.Delete(t.utilPod.Name, metav1.NewDeleteOptions(0)); err != nil {
framework.Logf("Delete of pod %v:%v failed: %v",
t.utilPod.Namespace, t.utilPod.Name, err)
}
}
func (t *dnsTestCommon) createDNSServer(aRecords map[string]string) {
t.dnsServerPod = &v1.Pod{
TypeMeta: metav1.TypeMeta{
Kind: "Pod",
},
ObjectMeta: metav1.ObjectMeta{
Namespace: t.f.Namespace.Name,
GenerateName: "e2e-dns-configmap-dns-server-",
},
Spec: v1.PodSpec{
Containers: []v1.Container{
{
Name: "dns",
Image: "gcr.io/google_containers/k8s-dns-dnsmasq-amd64:1.13.0",
Command: []string{
"/usr/sbin/dnsmasq",
"-u", "root",
"-k",
"--log-facility", "-",
"-q",
},
},
},
DNSPolicy: "Default",
},
}
for name, ip := range aRecords {
t.dnsServerPod.Spec.Containers[0].Command = append(
t.dnsServerPod.Spec.Containers[0].Command,
fmt.Sprintf("-A/%v/%v", name, ip))
}
var err error
t.dnsServerPod, err = t.c.Core().Pods(t.f.Namespace.Name).Create(t.dnsServerPod)
Expect(err).NotTo(HaveOccurred())
framework.Logf("Created pod %v", t.dnsServerPod)
Expect(t.f.WaitForPodRunning(t.dnsServerPod.Name)).NotTo(HaveOccurred())
t.dnsServerPod, err = t.c.Core().Pods(t.f.Namespace.Name).Get(
t.dnsServerPod.Name, metav1.GetOptions{})
Expect(err).NotTo(HaveOccurred())
}
func (t *dnsTestCommon) deleteDNSServerPod() {
podClient := t.c.Core().Pods(t.f.Namespace.Name)
if err := podClient.Delete(t.dnsServerPod.Name, metav1.NewDeleteOptions(0)); err != nil {
framework.Logf("Delete of pod %v:%v failed: %v",
t.utilPod.Namespace, t.dnsServerPod.Name, err)
}
}

259
test/e2e/dns_configmap.go
View File

@@ -18,68 +18,32 @@ package e2e
import (
"fmt"
"strings"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/kubernetes/pkg/api/v1"
"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
"k8s.io/kubernetes/test/e2e/framework"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
type dnsConfigMapTest struct {
f *framework.Framework
c clientset.Interface
ns string
name string
labels []string
type dnsFederationsConfigMapTest struct {
dnsTestCommon
cm *v1.ConfigMap
fedMap map[string]string
isValid bool
dnsPod *v1.Pod
utilPod *v1.Pod
utilService *v1.Service
}
var _ = framework.KubeDescribe("DNS config map", func() {
test := &dnsConfigMapTest{
f: framework.NewDefaultFramework("dns-config-map"),
ns: "kube-system",
name: "kube-dns",
}
var _ = framework.KubeDescribe("DNS configMap federations", func() {
t := &dnsNameserverTest{dnsTestCommon: newDnsTestCommon()}
BeforeEach(func() { t.c = t.f.ClientSet })
BeforeEach(func() {
test.c = test.f.ClientSet
})
It("should be able to change configuration", func() {
test.run()
It("should be able to change federation configuration", func() {
t.run()
})
})
func (t *dnsConfigMapTest) init() {
By("Finding a DNS pod")
label := labels.SelectorFromSet(labels.Set(map[string]string{"k8s-app": "kube-dns"}))
options := metav1.ListOptions{LabelSelector: label.String()}
pods, err := t.f.ClientSet.Core().Pods("kube-system").List(options)
Expect(err).NotTo(HaveOccurred())
Expect(len(pods.Items)).Should(BeNumerically(">=", 1))
t.dnsPod = &pods.Items[0]
framework.Logf("Using DNS pod: %v", t.dnsPod.Name)
}
func (t *dnsConfigMapTest) run() {
func (t *dnsFederationsConfigMapTest) run() {
t.init()
defer t.c.Core().ConfigMaps(t.ns).Delete(t.name, nil)
@@ -120,11 +84,7 @@ func (t *dnsConfigMapTest) run() {
t.validate()
}
func (t *dnsConfigMapTest) validate() {
t.validateFederation()
}
func (t *dnsConfigMapTest) validateFederation() {
func (t *dnsFederationsConfigMapTest) validate() {
federations := t.fedMap
if len(federations) == 0 {
@@ -161,155 +121,76 @@ func (t *dnsConfigMapTest) validateFederation() {
}
}
func (t *dnsConfigMapTest) checkDNSRecord(name string, predicate func([]string) bool, timeout time.Duration) {
var actual []string
err := wait.PollImmediate(
time.Duration(1)*time.Second,
timeout,
func() (bool, error) {
actual = t.runDig(name)
if predicate(actual) {
return true, nil
}
return false, nil
})
if err != nil {
framework.Logf("dig result did not match: %#v after %v",
actual, timeout)
}
}
// runDig querying for `dnsName`. Returns a list of responses.
func (t *dnsConfigMapTest) runDig(dnsName string) []string {
cmd := []string{
"/usr/bin/dig",
"+short",
"@" + t.dnsPod.Status.PodIP,
"-p", "10053", dnsName,
}
stdout, stderr, err := t.f.ExecWithOptions(framework.ExecOptions{
Command: cmd,
Namespace: t.f.Namespace.Name,
PodName: t.utilPod.Name,
ContainerName: "util",
CaptureStdout: true,
CaptureStderr: true,
})
framework.Logf("Running dig: %v, stdout: %q, stderr: %q, err: %v",
cmd, stdout, stderr, err)
if stdout == "" {
return []string{}
} else {
return strings.Split(stdout, "\n")
}
}
func (t *dnsConfigMapTest) setConfigMap(cm *v1.ConfigMap, fedMap map[string]string, isValid bool) {
func (t *dnsFederationsConfigMapTest) setConfigMap(cm *v1.ConfigMap, fedMap map[string]string, isValid bool) {
if isValid {
t.cm = cm
t.fedMap = fedMap
}
t.isValid = isValid
cm.ObjectMeta.Namespace = t.ns
cm.ObjectMeta.Name = t.name
options := metav1.ListOptions{
FieldSelector: fields.Set{
"metadata.namespace": t.ns,
"metadata.name": t.name,
}.AsSelector().String(),
}
cmList, err := t.c.Core().ConfigMaps(t.ns).List(options)
Expect(err).NotTo(HaveOccurred())
if len(cmList.Items) == 0 {
By(fmt.Sprintf("Creating the ConfigMap (%s:%s) %+v", t.ns, t.name, *cm))
_, err := t.c.Core().ConfigMaps(t.ns).Create(cm)
Expect(err).NotTo(HaveOccurred())
} else {
By(fmt.Sprintf("Updating the ConfigMap (%s:%s) to %+v", t.ns, t.name, *cm))
_, err := t.c.Core().ConfigMaps(t.ns).Update(cm)
Expect(err).NotTo(HaveOccurred())
}
t.dnsTestCommon.setConfigMap(cm)
}
func (t *dnsConfigMapTest) deleteConfigMap() {
By(fmt.Sprintf("Deleting the ConfigMap (%s:%s)", t.ns, t.name))
t.cm = nil
func (t *dnsFederationsConfigMapTest) deleteConfigMap() {
t.isValid = false
err := t.c.Core().ConfigMaps(t.ns).Delete(t.name, nil)
Expect(err).NotTo(HaveOccurred())
t.dnsTestCommon.deleteConfigMap()
}
func (t *dnsConfigMapTest) createUtilPod() {
// Actual port # doesn't matter, just need to exist.
const servicePort = 10101
t.utilPod = &v1.Pod{
TypeMeta: metav1.TypeMeta{
Kind: "Pod",
},
ObjectMeta: metav1.ObjectMeta{
Namespace: t.f.Namespace.Name,
Labels: map[string]string{"app": "e2e-dns-configmap"},
GenerateName: "e2e-dns-configmap-",
},
Spec: v1.PodSpec{
Containers: []v1.Container{
{
Name: "util",
Image: "gcr.io/google_containers/dnsutils:e2e",
Command: []string{"sleep", "10000"},
Ports: []v1.ContainerPort{
{ContainerPort: servicePort, Protocol: "TCP"},
},
},
},
},
}
var err error
t.utilPod, err = t.c.Core().Pods(t.f.Namespace.Name).Create(t.utilPod)
Expect(err).NotTo(HaveOccurred())
framework.Logf("Created pod %v", t.utilPod)
Expect(t.f.WaitForPodRunning(t.utilPod.Name)).NotTo(HaveOccurred())
t.utilService = &v1.Service{
TypeMeta: metav1.TypeMeta{
Kind: "Service",
},
ObjectMeta: metav1.ObjectMeta{
Namespace: t.f.Namespace.Name,
Name: "e2e-dns-configmap",
},
Spec: v1.ServiceSpec{
Selector: map[string]string{"app": "e2e-dns-configmap"},
Ports: []v1.ServicePort{
{
Protocol: "TCP",
Port: servicePort,
TargetPort: intstr.FromInt(servicePort),
},
},
},
}
t.utilService, err = t.c.Core().Services(t.f.Namespace.Name).Create(t.utilService)
Expect(err).NotTo(HaveOccurred())
framework.Logf("Created service %v", t.utilService)
type dnsNameserverTest struct {
dnsTestCommon
}
func (t *dnsConfigMapTest) deleteUtilPod() {
podClient := t.c.Core().Pods(t.f.Namespace.Name)
if err := podClient.Delete(t.utilPod.Name, metav1.NewDeleteOptions(0)); err != nil {
framework.Logf("Delete of pod %v:%v failed: %v",
t.utilPod.Namespace, t.utilPod.Name, err)
}
func (t *dnsNameserverTest) run() {
t.init()
t.createUtilPod()
defer t.deleteUtilPod()
t.createDNSServer(map[string]string{
"abc.acme.local": "1.1.1.1",
"def.acme.local": "2.2.2.2",
"widget.local": "3.3.3.3",
})
defer t.deleteDNSServerPod()
t.setConfigMap(&v1.ConfigMap{Data: map[string]string{
"stubDomains": fmt.Sprintf(`{"acme.local":["%v"]}`, t.dnsServerPod.Status.PodIP),
"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" },
"dnsmasq",
moreForeverTestTimeout)
t.checkDNSRecordFrom(
"def.acme.local",
func(actual []string) bool { return len(actual) == 1 && actual[0] == "2.2.2.2" },
"dnsmasq",
wait.ForeverTestTimeout)
t.checkDNSRecordFrom(
"widget.local",
func(actual []string) bool { return len(actual) == 1 && actual[0] == "3.3.3.3" },
"dnsmasq",
wait.ForeverTestTimeout)
t.c.Core().ConfigMaps(t.ns).Delete(t.name, nil)
// Wait for the deleted ConfigMap to take effect, otherwise the
// configuration can bleed into other tests.
t.checkDNSRecordFrom(
"abc.acme.local",
func(actual []string) bool { return len(actual) == 0 },
"dnsmasq",
moreForeverTestTimeout)
}
var _ = framework.KubeDescribe("DNS configMap nameserver", func() {
t := &dnsNameserverTest{dnsTestCommon: newDnsTestCommon()}
BeforeEach(func() { t.c = t.f.ClientSet })
It("should be able to change stubDomain configuration", func() {
t.run()
})
})