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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
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22
plugin/kubernetes/parse.go
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@@ -1,6 +1,8 @@
package kubernetes
import (
"strings"
"github.com/coredns/coredns/plugin/pkg/dnsutil"
"github.com/miekg/dns"
@@ -14,6 +16,7 @@ type recordRequest struct {
// SRV record.
protocol string
endpoint string
cluster string
// The servicename used in Kubernetes.
service string
// The namespace used in Kubernetes.
@@ -25,11 +28,12 @@ type recordRequest struct {
// parseRequest parses the qname to find all the elements we need for querying k8s. Anything
// that is not parsed will have the wildcard "*" value (except r.endpoint).
// Potential underscores are stripped from _port and _protocol.
func parseRequest(name, zone string) (r recordRequest, err error) {
// 3 Possible cases:
func parseRequest(name, zone string, multicluster bool) (r recordRequest, err error) {
// 4 Possible cases:
// 1. _port._protocol.service.namespace.pod|svc.zone
// 2. (endpoint): endpoint.service.namespace.pod|svc.zone
// 3. (service): service.namespace.pod|svc.zone
// 4. (endpoint multicluster): endpoint.cluster.service.namespace.pod|svc.zone
base, _ := dnsutil.TrimZone(name, zone)
// return NODATA for apex queries
@@ -63,14 +67,19 @@ func parseRequest(name, zone string) (r recordRequest, err error) {
return r, nil
}
// Because of ambiguity we check the labels left: 1: an endpoint. 2: port and protocol.
// Because of ambiguity we check the labels left: 1: an endpoint. 2: port and protocol or endpoint and clusterid.
// Anything else is a query that is too long to answer and can safely be delegated to return an nxdomain.
switch last {
case 0: // endpoint only
r.endpoint = segs[last]
case 1: // service and port
r.protocol = stripUnderscore(segs[last])
r.port = stripUnderscore(segs[last-1])
case 1: // service and port or endpoint and clusterid
if !multicluster || strings.HasPrefix(segs[last], "_") || strings.HasPrefix(segs[last-1], "_") {
r.protocol = stripUnderscore(segs[last])
r.port = stripUnderscore(segs[last-1])
} else {
r.cluster = segs[last]
r.endpoint = segs[last-1]
}
default: // too long
return r, errInvalidRequest
@@ -96,6 +105,7 @@ func (r recordRequest) String() string {
s := r.port
s += "." + r.protocol
s += "." + r.endpoint
s += "." + r.cluster
s += "." + r.service
s += "." + r.namespace
s += "." + r.podOrSvc