mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-08-06 01:26:59 +02:00
5a46584221
Pod source is a key feature of kOps' DNS Controller. Among other things, i is used for etcd and API discovery.
351 lines
9.1 KiB
Go
351 lines
9.1 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package source
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import (
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"context"
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"testing"
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"github.com/stretchr/testify/require"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes/fake"
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"sigs.k8s.io/external-dns/endpoint"
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)
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// testPodSource tests that various services generate the correct endpoints.
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func TestPodSource(t *testing.T) {
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for _, tc := range []struct {
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title string
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targetNamespace string
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expected []*endpoint.Endpoint
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expectError bool
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nodes []*corev1.Node
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pods []*corev1.Pod
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}{
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{
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"create records based on pod's external and internal IPs",
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"",
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[]*endpoint.Endpoint{
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{DNSName: "a.foo.example.org", Targets: endpoint.Targets{"54.10.11.1", "54.10.11.2"}, RecordType: endpoint.RecordTypeA},
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{DNSName: "internal.a.foo.example.org", Targets: endpoint.Targets{"10.0.1.1", "10.0.1.2"}, RecordType: endpoint.RecordTypeA},
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},
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false,
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[]*corev1.Node{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-node1",
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},
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Status: corev1.NodeStatus{
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Addresses: []corev1.NodeAddress{
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{Type: corev1.NodeExternalIP, Address: "54.10.11.1"},
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{Type: corev1.NodeInternalIP, Address: "10.0.1.1"},
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},
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-node2",
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},
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Status: corev1.NodeStatus{
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Addresses: []corev1.NodeAddress{
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{Type: corev1.NodeExternalIP, Address: "54.10.11.2"},
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{Type: corev1.NodeInternalIP, Address: "10.0.1.2"},
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},
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},
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},
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},
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[]*corev1.Pod{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-pod1",
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Namespace: "kube-system",
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Annotations: map[string]string{
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internalHostnameAnnotationKey: "internal.a.foo.example.org",
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hostnameAnnotationKey: "a.foo.example.org",
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},
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},
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Spec: corev1.PodSpec{
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HostNetwork: true,
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NodeName: "my-node1",
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},
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Status: corev1.PodStatus{
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PodIP: "10.0.1.1",
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-pod2",
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Namespace: "kube-system",
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Annotations: map[string]string{
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internalHostnameAnnotationKey: "internal.a.foo.example.org",
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hostnameAnnotationKey: "a.foo.example.org",
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},
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},
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Spec: corev1.PodSpec{
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HostNetwork: true,
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NodeName: "my-node2",
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},
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Status: corev1.PodStatus{
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PodIP: "10.0.1.2",
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},
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},
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},
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},
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{
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"create multiple records",
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"",
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[]*endpoint.Endpoint{
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{DNSName: "a.foo.example.org", Targets: endpoint.Targets{"54.10.11.1"}, RecordType: endpoint.RecordTypeA},
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{DNSName: "b.foo.example.org", Targets: endpoint.Targets{"54.10.11.2"}, RecordType: endpoint.RecordTypeA},
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},
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false,
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[]*corev1.Node{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-node1",
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},
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Status: corev1.NodeStatus{
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Addresses: []corev1.NodeAddress{
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{Type: corev1.NodeExternalIP, Address: "54.10.11.1"},
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{Type: corev1.NodeInternalIP, Address: "10.0.1.1"},
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},
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-node2",
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},
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Status: corev1.NodeStatus{
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Addresses: []corev1.NodeAddress{
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{Type: corev1.NodeExternalIP, Address: "54.10.11.2"},
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{Type: corev1.NodeInternalIP, Address: "10.0.1.2"},
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},
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},
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},
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},
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[]*corev1.Pod{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-pod1",
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Namespace: "kube-system",
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Annotations: map[string]string{
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hostnameAnnotationKey: "a.foo.example.org",
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},
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},
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Spec: corev1.PodSpec{
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HostNetwork: true,
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NodeName: "my-node1",
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},
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Status: corev1.PodStatus{
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PodIP: "10.0.1.1",
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-pod2",
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Namespace: "kube-system",
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Annotations: map[string]string{
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hostnameAnnotationKey: "b.foo.example.org",
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},
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},
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Spec: corev1.PodSpec{
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HostNetwork: true,
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NodeName: "my-node2",
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},
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Status: corev1.PodStatus{
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PodIP: "10.0.1.2",
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},
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},
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},
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},
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{
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"pods with hostNetwore=false should be ignored",
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"",
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[]*endpoint.Endpoint{
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{DNSName: "a.foo.example.org", Targets: endpoint.Targets{"54.10.11.1"}, RecordType: endpoint.RecordTypeA},
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{DNSName: "internal.a.foo.example.org", Targets: endpoint.Targets{"10.0.1.1"}, RecordType: endpoint.RecordTypeA},
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},
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false,
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[]*corev1.Node{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-node1",
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},
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Status: corev1.NodeStatus{
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Addresses: []corev1.NodeAddress{
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{Type: corev1.NodeExternalIP, Address: "54.10.11.1"},
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{Type: corev1.NodeInternalIP, Address: "10.0.1.1"},
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},
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-node2",
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},
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Status: corev1.NodeStatus{
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Addresses: []corev1.NodeAddress{
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{Type: corev1.NodeExternalIP, Address: "54.10.11.2"},
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{Type: corev1.NodeInternalIP, Address: "10.0.1.2"},
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},
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},
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},
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},
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[]*corev1.Pod{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-pod1",
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Namespace: "kube-system",
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Annotations: map[string]string{
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internalHostnameAnnotationKey: "internal.a.foo.example.org",
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hostnameAnnotationKey: "a.foo.example.org",
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},
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},
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Spec: corev1.PodSpec{
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HostNetwork: true,
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NodeName: "my-node1",
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},
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Status: corev1.PodStatus{
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PodIP: "10.0.1.1",
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-pod2",
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Namespace: "kube-system",
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Annotations: map[string]string{
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internalHostnameAnnotationKey: "internal.a.foo.example.org",
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hostnameAnnotationKey: "a.foo.example.org",
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},
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},
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Spec: corev1.PodSpec{
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HostNetwork: false,
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NodeName: "my-node2",
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},
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Status: corev1.PodStatus{
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PodIP: "100.0.1.2",
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},
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},
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},
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},
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{
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"only watch a given namespace",
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"kube-system",
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[]*endpoint.Endpoint{
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{DNSName: "a.foo.example.org", Targets: endpoint.Targets{"54.10.11.1"}, RecordType: endpoint.RecordTypeA},
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{DNSName: "internal.a.foo.example.org", Targets: endpoint.Targets{"10.0.1.1"}, RecordType: endpoint.RecordTypeA},
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},
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false,
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[]*corev1.Node{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-node1",
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},
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Status: corev1.NodeStatus{
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Addresses: []corev1.NodeAddress{
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{Type: corev1.NodeExternalIP, Address: "54.10.11.1"},
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{Type: corev1.NodeInternalIP, Address: "10.0.1.1"},
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},
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-node2",
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},
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Status: corev1.NodeStatus{
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Addresses: []corev1.NodeAddress{
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{Type: corev1.NodeExternalIP, Address: "54.10.11.2"},
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{Type: corev1.NodeInternalIP, Address: "10.0.1.2"},
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},
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},
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},
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},
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[]*corev1.Pod{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-pod1",
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Namespace: "kube-system",
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Annotations: map[string]string{
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internalHostnameAnnotationKey: "internal.a.foo.example.org",
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hostnameAnnotationKey: "a.foo.example.org",
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},
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},
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Spec: corev1.PodSpec{
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HostNetwork: true,
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NodeName: "my-node1",
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},
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Status: corev1.PodStatus{
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PodIP: "10.0.1.1",
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "my-pod2",
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Namespace: "default",
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Annotations: map[string]string{
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internalHostnameAnnotationKey: "internal.a.foo.example.org",
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hostnameAnnotationKey: "a.foo.example.org",
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},
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},
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Spec: corev1.PodSpec{
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HostNetwork: true,
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NodeName: "my-node2",
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},
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Status: corev1.PodStatus{
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PodIP: "100.0.1.2",
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},
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},
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},
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},
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} {
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t.Run(tc.title, func(t *testing.T) {
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// Create a Kubernetes testing client
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kubernetes := fake.NewSimpleClientset()
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ctx := context.Background()
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// Create the nodes
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for _, node := range tc.nodes {
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if _, err := kubernetes.CoreV1().Nodes().Create(ctx, node, metav1.CreateOptions{}); err != nil {
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t.Fatal(err)
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}
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}
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for _, pod := range tc.pods {
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pods := kubernetes.CoreV1().Pods(pod.Namespace)
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if _, err := pods.Create(ctx, pod, metav1.CreateOptions{}); err != nil {
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t.Fatal(err)
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}
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}
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client, err := NewPodSource(kubernetes, tc.targetNamespace)
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require.NoError(t, err)
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endpoints, err := client.Endpoints(ctx)
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if tc.expectError {
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require.Error(t, err)
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} else {
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require.NoError(t, err)
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}
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// Validate returned endpoints against desired endpoints.
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validateEndpoints(t, endpoints, tc.expected)
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})
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}
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}
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