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dns_test.go
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dns_test.go
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/*
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 dns
import (
"bytes"
"context"
"fmt"
"reflect"
"strings"
"testing"
"github.com/lithammer/dedent"
apps "k8s.io/api/apps/v1"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/intstr"
clientset "k8s.io/client-go/kubernetes"
clientsetfake "k8s.io/client-go/kubernetes/fake"
clientsetscheme "k8s.io/client-go/kubernetes/scheme"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
)
func TestCompileManifests(t *testing.T) {
replicas := int32(coreDNSReplicas)
var tests = []struct {
name string
manifest string
data interface{}
}{
{
name: "CoreDNSDeployment manifest",
manifest: CoreDNSDeployment,
data: struct {
DeploymentName, Image, ControlPlaneTaintKey string
Replicas *int32
}{
DeploymentName: "foo",
Image: "foo",
ControlPlaneTaintKey: "foo",
Replicas: &replicas,
},
},
{
name: "CoreDNSConfigMap manifest",
manifest: CoreDNSConfigMap,
data: struct{ DNSDomain string }{
DNSDomain: "foo",
},
},
}
for _, rt := range tests {
t.Run(rt.name, func(t *testing.T) {
_, err := kubeadmutil.ParseTemplate(rt.manifest, rt.data)
if err != nil {
t.Errorf("unexpected ParseTemplate failure: %+v", err)
}
})
}
}
func TestGetDNSIP(t *testing.T) {
var tests = []struct {
name, svcSubnet, expectedDNSIP string
isDualStack bool
}{
{
name: "subnet mask 12",
svcSubnet: "10.96.0.0/12",
expectedDNSIP: "10.96.0.10",
},
{
name: "subnet mask 26",
svcSubnet: "10.87.116.64/26",
expectedDNSIP: "10.87.116.74",
},
{
name: "dual-stack ipv4 primary, subnet mask 26",
svcSubnet: "10.87.116.64/26,fd03::/112",
expectedDNSIP: "10.87.116.74",
},
{
name: "dual-stack ipv6 primary, subnet mask 112",
svcSubnet: "fd03::/112,10.87.116.64/26",
expectedDNSIP: "fd03::a",
},
}
for _, rt := range tests {
t.Run(rt.name, func(t *testing.T) {
dnsIP, err := kubeadmconstants.GetDNSIP(rt.svcSubnet)
if err != nil {
t.Fatalf("couldn't get dnsIP : %v", err)
}
actualDNSIP := dnsIP.String()
if actualDNSIP != rt.expectedDNSIP {
t.Errorf(
"failed GetDNSIP\n\texpected: %s\n\t actual: %s",
rt.expectedDNSIP,
actualDNSIP,
)
}
})
}
}
func TestDeploymentsHaveSystemClusterCriticalPriorityClassName(t *testing.T) {
replicas := int32(coreDNSReplicas)
testCases := []struct {
name string
manifest string
data interface{}
}{
{
name: "CoreDNSDeployment",
manifest: CoreDNSDeployment,
data: struct {
DeploymentName, Image, ControlPlaneTaintKey, CoreDNSConfigMapName string
Replicas *int32
}{
DeploymentName: "foo",
Image: "foo",
ControlPlaneTaintKey: "foo",
CoreDNSConfigMapName: "foo",
Replicas: &replicas,
},
},
}
for _, testCase := range testCases {
t.Run(testCase.name, func(t *testing.T) {
deploymentBytes, _ := kubeadmutil.ParseTemplate(testCase.manifest, testCase.data)
deployment := &apps.Deployment{}
if err := runtime.DecodeInto(clientsetscheme.Codecs.UniversalDecoder(), deploymentBytes, deployment); err != nil {
t.Errorf("unexpected error: %v", err)
}
if deployment.Spec.Template.Spec.PriorityClassName != "system-cluster-critical" {
t.Errorf("expected to see system-cluster-critical priority class name. Got %q instead", deployment.Spec.Template.Spec.PriorityClassName)
}
})
}
}
func TestCreateCoreDNSAddon(t *testing.T) {
tests := []struct {
name string
initialCorefileData string
expectedCorefileData string
coreDNSVersion string
}{
{
name: "Empty Corefile",
initialCorefileData: "",
expectedCorefileData: `.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
`,
coreDNSVersion: "1.6.7",
},
{
name: "Default Corefile",
initialCorefileData: `.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf
cache 30
loop
reload
loadbalance
}
`,
expectedCorefileData: `.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
`,
coreDNSVersion: "1.6.7",
},
{
name: "Modified Corefile with only newdefaults needed",
initialCorefileData: `.:53 {
errors
log
health
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf
cache 30
loop
reload
loadbalance
}
`,
expectedCorefileData: `.:53 {
errors
log
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
`,
coreDNSVersion: "1.6.2",
},
{
name: "Default Corefile with rearranged plugins",
initialCorefileData: `.:53 {
errors
cache 30
prometheus :9153
forward . /etc/resolv.conf
loop
reload
loadbalance
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
upstream
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
health
}
`,
expectedCorefileData: `.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
`,
coreDNSVersion: "1.3.1",
},
{
name: "Remove Deprecated options",
initialCorefileData: `.:53 {
errors
logs
health
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
upstream
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf
cache 30
loop
reload
loadbalance
}`,
expectedCorefileData: `.:53 {
errors
logs
health {
lameduck 5s
}
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
ready
}
`,
coreDNSVersion: "1.3.1",
},
{
name: "Update proxy plugin to forward plugin",
initialCorefileData: `.:53 {
errors
health
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
upstream
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
proxy . /etc/resolv.conf
k8s_external example.com
cache 30
loop
reload
loadbalance
}`,
expectedCorefileData: `.:53 {
errors
health {
lameduck 5s
}
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
k8s_external example.com
cache 30
loop
reload
loadbalance
ready
}
`,
coreDNSVersion: "1.3.1",
},
{
name: "Modified Corefile with no migration required",
initialCorefileData: `consul {
errors
forward . 10.10.96.16:8600 10.10.96.17:8600 10.10.96.18:8600 {
max_concurrent 1000
}
loadbalance
cache 5
reload
}
domain.int {
errors
forward . 10.10.0.140 10.10.0.240 10.10.51.40 {
max_concurrent 1000
}
loadbalance
cache 3600
reload
}
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
prefer_udp
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
`,
expectedCorefileData: `consul {
errors
forward . 10.10.96.16:8600 10.10.96.17:8600 10.10.96.18:8600 {
max_concurrent 1000
}
loadbalance
cache 5
reload
}
domain.int {
errors
forward . 10.10.0.140 10.10.0.240 10.10.51.40 {
max_concurrent 1000
}
loadbalance
cache 3600
reload
}
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
prefer_udp
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
`,
coreDNSVersion: "1.6.7",
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
client := createClientAndCoreDNSManifest(t, tc.initialCorefileData, tc.coreDNSVersion)
configMapBytes, err := kubeadmutil.ParseTemplate(CoreDNSConfigMap, struct{ DNSDomain, UpstreamNameserver, StubDomain string }{
DNSDomain: "cluster.local",
UpstreamNameserver: "/etc/resolv.conf",
StubDomain: "",
})
if err != nil {
t.Errorf("unexpected ParseTemplate failure: %+v", err)
}
err = createCoreDNSAddon(nil, nil, configMapBytes, client)
if err != nil {
t.Fatalf("error creating the CoreDNS Addon: %v", err)
}
migratedConfigMap, _ := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(context.TODO(), kubeadmconstants.CoreDNSConfigMap, metav1.GetOptions{})
if !strings.EqualFold(migratedConfigMap.Data["Corefile"], tc.expectedCorefileData) {
t.Fatalf("expected to get %v, but got %v", tc.expectedCorefileData, migratedConfigMap.Data["Corefile"])
}
})
}
}
func createClientAndCoreDNSManifest(t *testing.T, corefile, coreDNSVersion string) *clientsetfake.Clientset {
client := clientsetfake.NewSimpleClientset()
_, err := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Create(context.TODO(), &v1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: kubeadmconstants.CoreDNSConfigMap,
Namespace: metav1.NamespaceSystem,
},
Data: map[string]string{
"Corefile": corefile,
},
}, metav1.CreateOptions{})
if err != nil {
t.Fatalf("error creating ConfigMap: %v", err)
}
_, err = client.AppsV1().Deployments(metav1.NamespaceSystem).Create(context.TODO(), &apps.Deployment{
TypeMeta: metav1.TypeMeta{
Kind: "Deployment",
APIVersion: "apps/v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: kubeadmconstants.CoreDNSConfigMap,
Namespace: metav1.NamespaceSystem,
Labels: map[string]string{
"k8s-app": "kube-dns",
},
},
Spec: apps.DeploymentSpec{
Template: v1.PodTemplateSpec{
Spec: v1.PodSpec{
Containers: []v1.Container{
{
Image: "test:" + coreDNSVersion,
},
},
},
},
},
}, metav1.CreateOptions{})
if err != nil {
t.Fatalf("error creating deployment: %v", err)
}
return client
}
func TestDeployedDNSReplicas(t *testing.T) {
tests := []struct {
name string
deploymentSize int
want int32
wantErr bool
}{
{
name: "one coredns addon deployment",
deploymentSize: 1,
want: 2,
wantErr: false,
},
{
name: "no coredns addon deployment",
deploymentSize: 0,
want: 5,
wantErr: false,
},
{
name: "multiple coredns addon deployments",
deploymentSize: 3,
want: 5,
wantErr: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
client := newMockClientForTest(t, 2, tt.deploymentSize, "", "", "")
got, err := deployedDNSReplicas(client, 5)
if (err != nil) != tt.wantErr {
t.Errorf("deployedDNSReplicas() error = %v, wantErr %v", err, tt.wantErr)
return
}
if *got != tt.want {
t.Errorf("deployedDNSReplicas() = %v, want %v", *got, tt.want)
}
})
}
}
func TestCoreDNSAddon(t *testing.T) {
type args struct {
cfg *kubeadmapi.ClusterConfiguration
client clientset.Interface
printManifest bool
}
tests := []struct {
name string
args args
wantOut string
wantErr bool
}{
{
name: "cfg is empty",
args: args{
cfg: &kubeadmapi.ClusterConfiguration{},
client: newMockClientForTest(t, 2, 1, "", "", ""),
printManifest: false,
},
wantOut: "",
wantErr: true,
},
{
name: "cfg is valid and not print Manifest",
args: args{
cfg: &kubeadmapi.ClusterConfiguration{
DNS: kubeadmapi.DNS{
ImageMeta: kubeadmapi.ImageMeta{
ImageRepository: "foo.bar.io",
},
},
Networking: kubeadmapi.Networking{
ServiceSubnet: "10.0.0.0/16",
},
},
client: newMockClientForTest(t, 2, 1, "", "", ""),
printManifest: false,
},
wantOut: "[addons] Applied essential addon: CoreDNS\n",
wantErr: false,
},
{
name: "cfg is valid and print Manifest",
args: args{
cfg: &kubeadmapi.ClusterConfiguration{
DNS: kubeadmapi.DNS{
ImageMeta: kubeadmapi.ImageMeta{
ImageRepository: "foo.bar.io",
},
},
Networking: kubeadmapi.Networking{
ServiceSubnet: "10.0.0.0/16",
},
},
client: newMockClientForTest(t, 2, 1, "", "", ""),
printManifest: true,
},
wantOut: dedent.Dedent(`---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
spec:
replicas: 3
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
tolerations:
- key: CriticalAddonsOnly
operator: Exists
- key: node-role.kubernetes.io/control-plane
effect: NoSchedule
nodeSelector:
kubernetes.io/os: linux
containers:
- name: coredns
image: foo.bar.io/coredns:v1.11.1
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- ALL
readOnlyRootFilesystem: true
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: v1
kind: Service
metadata:
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
# Without this resourceVersion value, an update of the Service between versions will yield:
# Service "kube-dns" is invalid: metadata.resourceVersion: Invalid value: "": must be specified for an update
resourceVersion: "0"
spec:
clusterIP: 10.0.0.10
ports:
- name: dns
port: 53
protocol: UDP
targetPort: 53
- name: dns-tcp
port: 53
protocol: TCP
targetPort: 53
- name: metrics
port: 9153
protocol: TCP
targetPort: 9153
selector:
k8s-app: kube-dns
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
`),
wantErr: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
out := &bytes.Buffer{}
var replicas int32 = 3
if err := coreDNSAddon(tt.args.cfg, tt.args.client, &replicas, "", out, tt.args.printManifest); (err != nil) != tt.wantErr {
t.Errorf("coreDNSAddon() error = %v, wantErr %v", err, tt.wantErr)
return
}
if gotOut := out.String(); gotOut != tt.wantOut {
t.Errorf("Actual output of coreDNSAddon() does not match expected.\nActual: %v\nExpected: %v\n", gotOut, tt.wantOut)
}
})
}
}
func TestEnsureDNSAddon(t *testing.T) {
type args struct {
cfg *kubeadmapi.ClusterConfiguration
client clientset.Interface
printManifest bool
}
tests := []struct {
name string
args args
wantOut string
wantErr bool
}{
{
name: "not print Manifest",
args: args{
cfg: &kubeadmapi.ClusterConfiguration{
DNS: kubeadmapi.DNS{
ImageMeta: kubeadmapi.ImageMeta{
ImageRepository: "foo.bar.io",
},
},
Networking: kubeadmapi.Networking{
ServiceSubnet: "10.0.0.0/16",
},
},
client: newMockClientForTest(t, 0, 1, "", "", ""),
printManifest: false,
},
wantOut: "[addons] Applied essential addon: CoreDNS\n",
},
{
name: "get dns replicas failed",
args: args{
cfg: &kubeadmapi.ClusterConfiguration{
DNS: kubeadmapi.DNS{
ImageMeta: kubeadmapi.ImageMeta{
ImageRepository: "foo.bar.io",
},
},
Networking: kubeadmapi.Networking{
ServiceSubnet: "10.0.0.0/16",
},
},
client: newMockClientForTest(t, 0, 2, "", "", ""),
printManifest: false,
},
wantErr: true,
wantOut: "",
},
{
name: "not print Manifest",
args: args{
cfg: &kubeadmapi.ClusterConfiguration{
DNS: kubeadmapi.DNS{
ImageMeta: kubeadmapi.ImageMeta{
ImageRepository: "foo.bar.io",
},
},
Networking: kubeadmapi.Networking{
ServiceSubnet: "10.0.0.0/16",
},
},
client: newMockClientForTest(t, 0, 1, "", "", ""),
printManifest: true,
},
wantOut: dedent.Dedent(`---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
spec:
replicas: 2
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
tolerations:
- key: CriticalAddonsOnly
operator: Exists
- key: node-role.kubernetes.io/control-plane
effect: NoSchedule
nodeSelector:
kubernetes.io/os: linux
containers:
- name: coredns
image: foo.bar.io/coredns:v1.11.1
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true