Mirrors/coredns
1
0
Fork 0
mirror of https://github.com/coredns/coredns.git synced 2025-10-28 16:54:15 -04:00
Code Issues Packages Projects Releases Wiki Activity

kubernetes: add multicluster support (#7266)

Browse Source 
* kubernetes: add multicluster support

Add multicluster support via Multi-Cluster Services API (MCS-API) via a
new option `multiclusterZones` in the kubernetes plugin.

When some multicluster zones are passed to the kubernetes plugin, it
will start watching the ServiceImport objects and its associated
EndpointSlices.

Signed-off-by: Arthur Outhenin-Chalandre <arthur@cri.epita.fr>

* kubernetes: implement xfr support for multicluster zones

Signed-off-by: Arthur Outhenin-Chalandre <arthur@cri.epita.fr>

---------

Signed-off-by: Arthur Outhenin-Chalandre <arthur@cri.epita.fr>
This commit is contained in:
Arthur Outhenin-Chalandre
2025-05-19 07:58:16 +02:00
committed by GitHub
parent 76b199f829
commit 5c71bd0b87
23 changed files with 1634 additions and 298 deletions
Download Patch File Download Diff File Expand all files Collapse all files

134
plugin/kubernetes/kubernetes_test.go
View File

@@ -3,6 +3,7 @@ package kubernetes
import (
"context"
"net"
"strings"
"testing"
"github.com/coredns/coredns/plugin"
@@ -12,10 +13,11 @@ import (
"github.com/miekg/dns"
api "k8s.io/api/core/v1"
meta "k8s.io/apimachinery/pkg/apis/meta/v1"
mcs "sigs.k8s.io/mcs-api/pkg/apis/v1alpha1"
)
func TestEndpointHostname(t *testing.T) {
var tests = []struct {
tests := []struct {
ip string
hostname string
expected string
@@ -46,7 +48,7 @@ func (APIConnServiceTest) PodIndex(string) []*object.Pod { return
func (APIConnServiceTest) SvcIndexReverse(string) []*object.Service { return nil }
func (APIConnServiceTest) SvcExtIndexReverse(string) []*object.Service { return nil }
func (APIConnServiceTest) EpIndexReverse(string) []*object.Endpoints { return nil }
func (APIConnServiceTest) Modified(bool) int64 { return 0 }
func (APIConnServiceTest) Modified(ModifiedMode) int64 { return 0 }
func (APIConnServiceTest) SvcIndex(string) []*object.Service {
svcs := []*object.Service{
@@ -225,6 +227,107 @@ func (APIConnServiceTest) EndpointsList() []*object.Endpoints {
return eps
}
func (APIConnServiceTest) SvcImportIndex(string) []*object.ServiceImport {
svcs := []*object.ServiceImport{
{
Name: "svc1",
Namespace: "testns",
Type: mcs.ClusterSetIP,
ClusterIPs: []string{"10.0.0.1"},
Ports: []mcs.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
},
{
Name: "svc-dual-stack",
Namespace: "testns",
Type: mcs.ClusterSetIP,
ClusterIPs: []string{"10.0.0.2", "10::2"},
Ports: []mcs.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
},
{
Name: "hdls1",
Namespace: "testns",
Type: mcs.Headless,
ClusterIPs: []string{},
},
}
return svcs
}
func (APIConnServiceTest) ServiceImportList() []*object.ServiceImport {
svcs := []*object.ServiceImport{
{
Name: "",
Namespace: "testns",
Type: mcs.ClusterSetIP,
ClusterIPs: []string{"10.0.0.1"},
Ports: []mcs.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
},
{
Name: "svc-dual-stack",
Namespace: "testns",
Type: mcs.ClusterSetIP,
ClusterIPs: []string{"10.0.0.2", "10::2"},
Ports: []mcs.ServicePort{
{Name: "http", Protocol: "tcp", Port: 80},
},
},
{
Name: "hdls1",
Namespace: "testns",
Type: mcs.Headless,
},
}
return svcs
}
func (APIConnServiceTest) McEpIndex(string) []*object.MultiClusterEndpoints {
eps := []*object.MultiClusterEndpoints{
{
Endpoints: object.Endpoints{
Subsets: []object.EndpointSubset{
{
Addresses: []object.EndpointAddress{
{IP: "172.0.0.1", Hostname: "ep1a"},
},
Ports: []object.EndpointPort{
{Port: 80, Protocol: "tcp", Name: "http"},
},
},
},
Name: "svc1-slice1",
Namespace: "testns",
Index: object.EndpointsKey("svc1", "testns"),
},
ClusterId: "cluster1",
},
{
Endpoints: object.Endpoints{
Subsets: []object.EndpointSubset{
{
Addresses: []object.EndpointAddress{
{IP: "172.0.0.2"},
},
Ports: []object.EndpointPort{
{Port: 80, Protocol: "tcp", Name: "http"},
},
},
},
Name: "hdls1-slice1",
Namespace: "testns",
Index: object.EndpointsKey("hdls1", "testns"),
},
ClusterId: "cluster1",
},
}
return eps
}
func (APIConnServiceTest) GetNodeByName(ctx context.Context, name string) (*api.Node, error) {
return &api.Node{
ObjectMeta: meta.ObjectMeta{
@@ -240,7 +343,8 @@ func (APIConnServiceTest) GetNamespaceByName(name string) (*object.Namespace, er
}
func TestServices(t *testing.T) {
k := New([]string{"interwebs.test."})
k := New([]string{"interwebs.test.", "clusterset.test."})
k.opts.multiclusterZones = []string{"clusterset.test."}
k.APIConn = &APIConnServiceTest{}
type svcAns struct {
@@ -273,12 +377,34 @@ func TestServices(t *testing.T) {
// Headless Services
{qname: "hdls1.testns.svc.interwebs.test.", qtype: dns.TypeA, answer: []svcAns{{host: "172.0.0.2", key: "/" + coredns + "/test/interwebs/svc/testns/hdls1/172-0-0-2"}}},
// ClusterSet MultiCluster IP Services
{qname: "svc1.testns.svc.clusterset.test.", qtype: dns.TypeA, answer: []svcAns{{host: "10.0.0.1", key: "/" + coredns + "/test/clusterset/svc/testns/svc1"}}},
{qname: "_http._tcp.svc1.testns.svc.clusterset.test.", qtype: dns.TypeSRV, answer: []svcAns{{host: "10.0.0.1", key: "/" + coredns + "/test/clusterset/svc/testns/svc1"}}},
{qname: "ep1a.cluster1.svc1.testns.svc.clusterset.test.", qtype: dns.TypeA, answer: []svcAns{{host: "172.0.0.1", key: "/" + coredns + "/test/clusterset/svc/testns/svc1/cluster1/ep1a"}}},
// Dual-Stack ClusterSet MultiCluster IP Service
{
qname: "_http._tcp.svc-dual-stack.testns.svc.clusterset.test.",
qtype: dns.TypeSRV,
answer: []svcAns{
{host: "10.0.0.2", key: "/" + coredns + "/test/clusterset/svc/testns/svc-dual-stack"},
{host: "10::2", key: "/" + coredns + "/test/clusterset/svc/testns/svc-dual-stack"},
},
},
// Headless MultiCluster Services
{qname: "hdls1.testns.svc.clusterset.test.", qtype: dns.TypeA, answer: []svcAns{{host: "172.0.0.2", key: "/" + coredns + "/test/clusterset/svc/testns/hdls1/cluster1/172-0-0-2"}}},
}
for i, test := range tests {
zone := "interwebs.test."
if strings.Contains(test.qname, "clusterset.test") {
zone = "clusterset.test."
}
state := request.Request{
Req: &dns.Msg{Question: []dns.Question{{Name: test.qname, Qtype: test.qtype}}},
Zone: "interwebs.test.", // must match from k.Zones[0]
Zone: zone,
}
svcs, e := k.Services(context.TODO(), state, false, plugin.Options{})
if e != nil {