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kubernetes: add multicluster support (#7266)

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* 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

72
plugin/kubernetes/xfr_test.go
View File

@@ -38,7 +38,24 @@ func TestKubernetesAXFR(t *testing.T) {
if err != nil {
t.Error(err)
}
validateAXFR(t, ch)
validateAXFR(t, ch, false)
}
func TestKubernetesMultiClusterAXFR(t *testing.T) {
k := New([]string{"cluster.local.", "clusterset.local."})
k.opts.multiclusterZones = []string{"clusterset.local."}
k.APIConn = &APIConnServeTest{}
k.Namespaces = map[string]struct{}{"testns": {}, "kube-system": {}}
k.localIPs = []net.IP{net.ParseIP("10.0.0.10")}
dnsmsg := &dns.Msg{}
dnsmsg.SetAxfr("clusterset.local.")
ch, err := k.Transfer("clusterset.local.", 0)
if err != nil {
t.Error(err)
}
validateAXFR(t, ch, true)
}
func TestKubernetesIXFRFallback(t *testing.T) {
@@ -54,7 +71,7 @@ func TestKubernetesIXFRFallback(t *testing.T) {
if err != nil {
t.Error(err)
}
validateAXFR(t, ch)
validateAXFR(t, ch, false)
}
func TestKubernetesIXFRCurrent(t *testing.T) {
@@ -87,7 +104,7 @@ func TestKubernetesIXFRCurrent(t *testing.T) {
}
}
func validateAXFR(t *testing.T, ch <-chan []dns.RR) {
func validateAXFR(t *testing.T, ch <-chan []dns.RR, multicluster bool) {
xfr := []dns.RR{}
for rrs := range ch {
xfr = append(xfr, rrs...)
@@ -96,7 +113,11 @@ func validateAXFR(t *testing.T, ch <-chan []dns.RR) {
t.Error("Invalid transfer response, does not start with SOA record")
}
zp := dns.NewZoneParser(strings.NewReader(expectedZone), "", "")
expected := expectedZone
if multicluster {
expected = expectedMultiClusterZone
}
zp := dns.NewZoneParser(strings.NewReader(expected), "", "")
i := 0
for rr, ok := zp.Next(); ok; rr, ok = zp.Next() {
if !dns.IsDuplicate(rr, xfr[i]) {
@@ -154,3 +175,46 @@ svcempty.testns.svc.cluster.local. 5 IN SRV 0 100 80 svcempty.testns.svc.cluster
_http._tcp.svcempty.testns.svc.cluster.local. 5 IN SRV 0 100 80 svcempty.testns.svc.cluster.local.
cluster.local. 5 IN SOA ns.dns.cluster.local. hostmaster.cluster.local. 3 7200 1800 86400 5
`
const expectedMultiClusterZone = `
clusterset.local. 5 IN SOA ns.dns.clusterset.local. hostmaster.clusterset.local. 3 7200 1800 86400 5
clusterset.local. 5 IN NS ns.dns.clusterset.local.
ns.dns.clusterset.local. 5 IN A 10.0.0.10
hdls1.testns.svc.clusterset.local. 5 IN A 172.0.0.2
172-0-0-2.hdls1.testns.svc.clusterset.local. 5 IN A 172.0.0.2
_http._tcp.hdls1.testns.svc.clusterset.local. 5 IN SRV 0 16 80 172-0-0-2.hdls1.testns.svc.clusterset.local.
hdls1.testns.svc.clusterset.local. 5 IN A 172.0.0.3
172-0-0-3.hdls1.testns.svc.clusterset.local. 5 IN A 172.0.0.3
_http._tcp.hdls1.testns.svc.clusterset.local. 5 IN SRV 0 16 80 172-0-0-3.hdls1.testns.svc.clusterset.local.
hdls1.testns.svc.clusterset.local. 5 IN A 172.0.0.4
dup-name.hdls1.testns.svc.clusterset.local. 5 IN A 172.0.0.4
_http._tcp.hdls1.testns.svc.clusterset.local. 5 IN SRV 0 16 80 dup-name.hdls1.testns.svc.clusterset.local.
hdls1.testns.svc.clusterset.local. 5 IN A 172.0.0.5
dup-name.hdls1.testns.svc.clusterset.local. 5 IN A 172.0.0.5
_http._tcp.hdls1.testns.svc.clusterset.local. 5 IN SRV 0 16 80 dup-name.hdls1.testns.svc.clusterset.local.
hdls1.testns.svc.clusterset.local. 5 IN AAAA 5678:abcd::1
5678-abcd--1.hdls1.testns.svc.clusterset.local. 5 IN AAAA 5678:abcd::1
_http._tcp.hdls1.testns.svc.clusterset.local. 5 IN SRV 0 16 80 5678-abcd--1.hdls1.testns.svc.clusterset.local.
hdls1.testns.svc.clusterset.local. 5 IN AAAA 5678:abcd::2
5678-abcd--2.hdls1.testns.svc.clusterset.local. 5 IN AAAA 5678:abcd::2
_http._tcp.hdls1.testns.svc.clusterset.local. 5 IN SRV 0 16 80 5678-abcd--2.hdls1.testns.svc.clusterset.local.
hdlsprtls.testns.svc.clusterset.local. 5 IN A 172.0.0.20
172-0-0-20.hdlsprtls.testns.svc.clusterset.local. 5 IN A 172.0.0.20
kubedns.kube-system.svc.clusterset.local. 5 IN A 10.0.0.10
kubedns.kube-system.svc.clusterset.local. 5 IN SRV 0 100 53 kubedns.kube-system.svc.clusterset.local.
_dns._udp.kubedns.kube-system.svc.clusterset.local. 5 IN SRV 0 100 53 kubedns.kube-system.svc.clusterset.local.
svc-dual-stack.testns.svc.clusterset.local. 5 IN A 10.0.0.3
svc-dual-stack.testns.svc.clusterset.local. 5 IN AAAA 10::3
svc-dual-stack.testns.svc.clusterset.local. 5 IN SRV 0 100 80 svc-dual-stack.testns.svc.clusterset.local.
_http._tcp.svc-dual-stack.testns.svc.clusterset.local. 5 IN SRV 0 100 80 svc-dual-stack.testns.svc.clusterset.local.
svc1.testns.svc.clusterset.local. 5 IN A 10.0.0.1
svc1.testns.svc.clusterset.local. 5 IN SRV 0 100 80 svc1.testns.svc.clusterset.local.
_http._tcp.svc1.testns.svc.clusterset.local. 5 IN SRV 0 100 80 svc1.testns.svc.clusterset.local.
svc6.testns.svc.clusterset.local. 5 IN AAAA 1234:abcd::1
svc6.testns.svc.clusterset.local. 5 IN SRV 0 100 80 svc6.testns.svc.clusterset.local.
_http._tcp.svc6.testns.svc.clusterset.local. 5 IN SRV 0 100 80 svc6.testns.svc.clusterset.local.
svcempty.testns.svc.clusterset.local. 5 IN A 10.0.0.1
svcempty.testns.svc.clusterset.local. 5 IN SRV 0 100 80 svcempty.testns.svc.clusterset.local.
_http._tcp.svcempty.testns.svc.clusterset.local. 5 IN SRV 0 100 80 svcempty.testns.svc.clusterset.local.
clusterset.local. 5 IN SOA ns.dns.clusterset.local. hostmaster.clusterset.local. 3 7200 1800 86400 5
`