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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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13
plugin/kubernetes/README.md
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@@ -42,6 +42,7 @@ kubernetes [ZONES...] {
noendpoints
fallthrough [ZONES...]
ignore empty_service
multicluster [ZONES...]
}
```
@@ -101,6 +102,10 @@ kubernetes [ZONES...] {
* `ignore empty_service` returns NXDOMAIN for services without any ready endpoint addresses (e.g., ready pods).
This allows the querying pod to continue searching for the service in the search path.
The search path could, for example, include another Kubernetes cluster.
* `multicluster` defines the multicluster zones as defined by Multi-Cluster
Services API (MCS-API). Specifying this option is generally paired with the
installation of an MCS-API implementation and the ServiceImport and ServiceExport
CRDs. The plugin MUST be authoritative for the zones listed here.
Enabling zone transfer is done by using the *transfer* plugin.
@@ -157,6 +162,14 @@ kubernetes cluster.local {
}
~~~
Configure multicluster
~~~ txt
kubernetes cluster.local clusterset.local {
multicluster clusterset.local
}
~~~
## stubDomains and upstreamNameservers
Here we use the *forward* plugin to implement a stubDomain that forwards `example.local` to the nameserver `10.100.0.10:53`.