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external-dns/source/service_fqdn_test.go
vflaux ef6e0e5e1e
feat(source): use EndpointSlices instead of Endpoints for Service (#5493) 
* feat(source): use EndpointSlice for Service source

* feat(source): use indexer for EndpointSlice listing
2025-06-19 03:06:52 -07:00

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/*
Copyright 2025 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 source
import (
"fmt"
"testing"
"github.com/stretchr/testify/require"
v1 "k8s.io/api/core/v1"
discoveryv1 "k8s.io/api/discovery/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/kubernetes/fake"
"sigs.k8s.io/external-dns/endpoint"
"sigs.k8s.io/external-dns/internal/testutils"
"sigs.k8s.io/external-dns/source/annotations"
)
func TestServiceSourceFqdnTemplatingExamples(t *testing.T) {
for _, tt := range []struct {
title string
services []*v1.Service
endpointSlices []*discoveryv1.EndpointSlice
fqdnTemplate string
combineFQDN bool
publishHostIp bool
expected []*endpoint.Endpoint
}{
{
title: "templating with multiple services",
combineFQDN: true,
services: []*v1.Service{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-1",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "170.19.58.167",
},
Status: v1.ServiceStatus{},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "kube-system",
Name: "service-2",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "127.20.24.218",
},
Status: v1.ServiceStatus{},
},
},
fqdnTemplate: "{{ .Name }}.{{ .Namespace }}.example.tld, all.example.org",
expected: []*endpoint.Endpoint{
{DNSName: "all.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"127.20.24.218", "170.19.58.167"}},
{DNSName: "service-1.default.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"170.19.58.167"}},
{DNSName: "service-2.kube-system.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"127.20.24.218"}},
},
},
{
title: "templating resolve service source with internal hostnames",
combineFQDN: true,
services: []*v1.Service{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one",
Annotations: map[string]string{
annotations.InternalHostnameKey: "service-one.internal.tld,service-one.internal.example.tld",
},
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeLoadBalancer,
ClusterIP: "192.240.240.3",
ClusterIPs: []string{"192.240.240.3", "192.240.240.4"},
},
Status: v1.ServiceStatus{
LoadBalancer: v1.LoadBalancerStatus{
Ingress: []v1.LoadBalancerIngress{
{Hostname: "service-one.example.tld"},
},
},
},
},
},
fqdnTemplate: "{{.Name }}.example.tld",
expected: []*endpoint.Endpoint{
{DNSName: "service-one.example.tld", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"service-one.example.tld"}},
{DNSName: "service-one.internal.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.240.240.3"}},
{DNSName: "service-one.internal.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.240.240.3"}},
},
},
{
title: "templating resolve service by service type",
services: []*v1.Service{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeLoadBalancer,
},
Status: v1.ServiceStatus{
LoadBalancer: v1.LoadBalancerStatus{
Ingress: []v1.LoadBalancerIngress{
{Hostname: "service-one.example.tld"},
},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-two",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeExternalName,
ExternalName: "bucket-name.s3.us-east-1.amazonaws.com",
},
},
},
fqdnTemplate: `{{ if eq .Spec.Type "ExternalName" }}{{ .Name }}.external.example.tld{{ end}}`,
expected: []*endpoint.Endpoint{
// TODO: This test shows that there is a bug that needs to be fixed in the external-dns logic.
{DNSName: "", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"service-one.example.tld"}},
{DNSName: "service-two.external.example.tld", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"bucket-name.s3.us-east-1.amazonaws.com"}},
},
},
{
title: "templating resolve service with selector",
combineFQDN: false,
services: []*v1.Service{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeExternalName,
ExternalName: "api.example.tld",
Selector: map[string]string{
"app": "my-app",
},
},
Status: v1.ServiceStatus{},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-two",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeExternalName,
ExternalName: "www.bucket-name.amazonaws.com",
Selector: map[string]string{
"app": "my-website",
},
},
},
},
fqdnTemplate: `{{ if eq (index .Spec.Selector "app") "my-website" }}www.{{ .Name }}.website.example.tld{{ end}}`,
expected: []*endpoint.Endpoint{
// TODO: This test shows that there is a bug that needs to be fixed in the external-dns logic.
{DNSName: "", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"api.example.tld"}},
{DNSName: "www.service-two.website.example.tld", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"www.bucket-name.amazonaws.com"}},
},
},
{
title: "templating resolve service with zone PreferSameTrafficDistribution and topology.kubernetes.io/zone annotation",
services: []*v1.Service{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one",
Annotations: map[string]string{
"topology.kubernetes.io/zone": "us-west-1a",
},
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "192.51.100.22",
ExternalIPs: []string{"198.51.100.30"},
// https://kubernetes.io/docs/reference/networking/virtual-ips/#traffic-distribution
TrafficDistribution: testutils.ToPtr("PreferSameZone"),
},
Status: v1.ServiceStatus{},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-two",
Annotations: map[string]string{
"topology.kubernetes.io/zone": "us-west-1c",
},
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "192.51.100.5",
ExternalIPs: []string{"198.51.100.32"},
TrafficDistribution: testutils.ToPtr("PreferSameZone"),
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-three",
Annotations: map[string]string{
"topology.kubernetes.io/zone": "us-west-1a",
},
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "192.51.100.33",
ExternalIPs: []string{"198.51.100.70"},
TrafficDistribution: testutils.ToPtr("PreferClose"),
},
},
},
// printf is used to ensure the template is evaluated as a string, as the TrafficDistribution field is a pointer.
fqdnTemplate: `{{ $annotations := .ObjectMeta.Annotations }}{{ .Name }}{{ if eq (.Spec.TrafficDistribution | printf) "PreferSameZone" }}.zone.{{ index $annotations "topology.kubernetes.io/zone" }}{{ else }}.close{{ end }}.example.tld`,
expected: []*endpoint.Endpoint{
{DNSName: "service-one.zone.us-west-1a.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.51.100.22"}},
{DNSName: "service-two.zone.us-west-1c.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.51.100.5"}},
{DNSName: "service-three.close.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.51.100.33"}},
},
},
{
title: "templating resolve services with specific port names",
services: []*v1.Service{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "192.51.100.22",
Ports: []v1.ServicePort{
{Name: "http", Port: 8080},
{Name: "debug", Port: 8082},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-two",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "192.51.100.5",
Ports: []v1.ServicePort{
{Name: "http", Port: 8080},
{Name: "http2", Port: 8086},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-three",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: "2041:0000:140F::875B:131B",
Ports: []v1.ServicePort{
{Name: "debug", Port: 8082},
{Name: "http2", Port: 8086},
},
},
},
},
fqdnTemplate: `{{ $name := .Name }}{{ range .Spec.Ports -}}{{ $name }}{{ if eq .Name "http2" }}.http2{{ else if eq .Name "debug" }}.debug{{ end }}.example.tld{{printf "," }}{{ end }}`,
expected: []*endpoint.Endpoint{
// TODO: This test shows that there is a bug that needs to be fixed in the external-dns logic.
{DNSName: "", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.51.100.22", "192.51.100.5"}},
{DNSName: "", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2041:0000:140F::875B:131B"}},
{DNSName: "service-one.debug.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.51.100.22"}},
{DNSName: "service-one.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.51.100.22"}},
{DNSName: "service-three.debug.example.tld", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2041:0000:140F::875B:131B"}},
{DNSName: "service-three.http2.example.tld", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2041:0000:140F::875B:131B"}},
{DNSName: "service-two.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.51.100.5"}},
{DNSName: "service-two.http2.example.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"192.51.100.5"}},
},
},
{
title: "templating resolves headless services",
publishHostIp: false,
services: []*v1.Service{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: v1.ClusterIPNone,
IPFamilies: []v1.IPFamily{v1.IPv4Protocol},
Ports: []v1.ServicePort{
{Name: "http", Port: 8080},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-two",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: v1.ClusterIPNone,
IPFamilies: []v1.IPFamily{v1.IPv4Protocol, v1.IPv6Protocol},
Ports: []v1.ServicePort{
{Name: "http", Port: 8080},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-three",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: v1.ClusterIPNone,
IPFamilies: []v1.IPFamily{v1.IPv4Protocol},
Ports: []v1.ServicePort{
{Name: "debug", Port: 8082},
},
},
},
},
endpointSlices: []*discoveryv1.EndpointSlice{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one-xxxxx",
Labels: map[string]string{
discoveryv1.LabelServiceName: "service-one",
},
},
AddressType: discoveryv1.AddressTypeIPv4,
Endpoints: []discoveryv1.Endpoint{
{
Addresses: []string{"100.66.2.241"},
Hostname: testutils.ToPtr("ip-10-1-164-158.internal"),
TargetRef: &v1.ObjectReference{
Kind: "Pod",
Name: "pod-1",
Namespace: "default",
},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-two-xxxxx",
Labels: map[string]string{
discoveryv1.LabelServiceName: "service-two",
},
},
AddressType: discoveryv1.AddressTypeIPv4,
Endpoints: []discoveryv1.Endpoint{
{
Addresses: []string{"100.66.2.244"},
Hostname: testutils.ToPtr("ip-10-1-164-152.internal"),
TargetRef: &v1.ObjectReference{
Kind: "Pod",
Name: "pod-2",
Namespace: "default",
},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-three-xxxxx",
Labels: map[string]string{
discoveryv1.LabelServiceName: "service-three",
},
},
AddressType: discoveryv1.AddressTypeIPv4,
Endpoints: []discoveryv1.Endpoint{
{
Addresses: []string{"100.66.2.246"},
Hostname: testutils.ToPtr("ip-10-1-164-158.internal"),
TargetRef: &v1.ObjectReference{
Kind: "Pod",
Name: "pod-3",
Namespace: "default",
},
},
{
Addresses: []string{"100.66.2.247"},
Hostname: testutils.ToPtr("ip-10-1-164-158.internal"),
TargetRef: &v1.ObjectReference{
Kind: "Pod",
Name: "pod-4",
Namespace: "default",
},
},
},
},
},
fqdnTemplate: `{{ .Name }}.org.tld`,
expected: []*endpoint.Endpoint{
{DNSName: "ip-10-1-164-152.internal.service-two.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"100.66.2.244"}},
{DNSName: "ip-10-1-164-158.internal.service-one.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"100.66.2.241"}},
{DNSName: "ip-10-1-164-158.internal.service-three.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"100.66.2.246", "100.66.2.247"}},
{DNSName: "service-one.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"100.66.2.241"}},
{DNSName: "service-three.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"100.66.2.246", "100.66.2.247"}},
{DNSName: "service-two.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"100.66.2.244"}},
},
},
{
title: "templating resolves headless services with publishHostIp set to true",
publishHostIp: true,
services: []*v1.Service{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: v1.ClusterIPNone,
IPFamilies: []v1.IPFamily{v1.IPv4Protocol},
Ports: []v1.ServicePort{
{Name: "http", Port: 8080},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-two",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: v1.ClusterIPNone,
IPFamilies: []v1.IPFamily{v1.IPv4Protocol, v1.IPv6Protocol},
Ports: []v1.ServicePort{
{Name: "http", Port: 8080},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-three",
},
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
ClusterIP: v1.ClusterIPNone,
IPFamilies: []v1.IPFamily{v1.IPv4Protocol},
Ports: []v1.ServicePort{
{Name: "debug", Port: 8082},
},
},
},
},
endpointSlices: []*discoveryv1.EndpointSlice{
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-one-xxxxx",
Labels: map[string]string{
discoveryv1.LabelServiceName: "service-one",
},
},
AddressType: discoveryv1.AddressTypeIPv4,
Endpoints: []discoveryv1.Endpoint{
{
Addresses: []string{"100.66.2.241"},
Hostname: testutils.ToPtr("ip-10-1-164-158.internal"),
TargetRef: &v1.ObjectReference{
Kind: "Pod",
Name: "pod-1",
Namespace: "default",
},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-two-xxxxx",
Labels: map[string]string{
discoveryv1.LabelServiceName: "service-two",
},
},
AddressType: discoveryv1.AddressTypeIPv4,
Endpoints: []discoveryv1.Endpoint{
{
Addresses: []string{"100.66.2.244"},
Hostname: testutils.ToPtr("ip-10-1-164-152.internal"),
TargetRef: &v1.ObjectReference{
Kind: "Pod",
Name: "pod-2",
Namespace: "default",
},
},
},
},
{
ObjectMeta: metav1.ObjectMeta{
Namespace: "default",
Name: "service-three-xxxxx",
Labels: map[string]string{
discoveryv1.LabelServiceName: "service-three",
},
},
AddressType: discoveryv1.AddressTypeIPv4,
Endpoints: []discoveryv1.Endpoint{
{
Addresses: []string{"100.66.2.246"},
Hostname: testutils.ToPtr("ip-10-1-164-158.internal"),
TargetRef: &v1.ObjectReference{
Kind: "Pod",
Name: "pod-3",
Namespace: "default",
},
},
{
Addresses: []string{"100.66.2.247"},
Hostname: testutils.ToPtr("ip-10-1-164-158.internal"),
TargetRef: &v1.ObjectReference{
Kind: "Pod",
Name: "pod-4",
Namespace: "default",
},
},
},
},
},
fqdnTemplate: `{{ .Name }}.org.tld`,
expected: []*endpoint.Endpoint{
{DNSName: "ip-10-1-164-152.internal.service-two.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.1.20.40"}},
{DNSName: "ip-10-1-164-158.internal.service-one.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.1.20.40"}},
{DNSName: "ip-10-1-164-158.internal.service-three.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.1.20.40", "10.1.20.41"}},
{DNSName: "service-one.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.1.20.40"}},
{DNSName: "service-three.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.1.20.40", "10.1.20.41"}},
{DNSName: "service-two.org.tld", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.1.20.40"}},
},
},
} {
t.Run(tt.title, func(t *testing.T) {
kubeClient := fake.NewClientset()
for _, el := range tt.services {
_, err := kubeClient.CoreV1().Services(el.Namespace).Create(t.Context(), el, metav1.CreateOptions{})
require.NoError(t, err)
}
// Create endpoints and pods for the services
for _, el := range tt.endpointSlices {
_, err := kubeClient.DiscoveryV1().EndpointSlices(el.Namespace).Create(t.Context(), el, metav1.CreateOptions{})
require.NoError(t, err)
for i, ep := range el.Endpoints {
_, err = kubeClient.CoreV1().Pods(el.Namespace).Create(t.Context(), &v1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: ep.TargetRef.Name,
Namespace: el.Namespace,
},
Spec: v1.PodSpec{
Hostname: *ep.Hostname,
},
Status: v1.PodStatus{
HostIP: fmt.Sprintf("10.1.20.4%d", i),
},
}, metav1.CreateOptions{})
require.NoError(t, err)
}
}
src, err := NewServiceSource(
t.Context(),
kubeClient,
"",
"",
tt.fqdnTemplate,
tt.combineFQDN,
"",
true,
tt.publishHostIp,
true,
[]string{},
false,
labels.Everything(),
false,
false,
true,
)
require.NoError(t, err)
endpoints, err := src.Endpoints(t.Context())
require.NoError(t, err)
validateEndpoints(t, endpoints, tt.expected)
// TODO; when all resources have the resource label, we could add this check to the validateEndpoints function.
for _, ep := range endpoints {
require.Contains(t, ep.Labels, endpoint.ResourceLabelKey)
}
})
}
}
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