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Jan 15, 2025
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docs: add hint regarding cluster domain to improve DNS performance #698

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docs: add hint regarding cluster domain to improve DNS performance
dervoeti Jan 14, 2025
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Update modules/guides/pages/kubernetes-cluster-domain.adoc
dervoeti Jan 14, 2025
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8 changes: 5 additions & 3 deletions modules/guides/pages/kubernetes-cluster-domain.adoc
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
= Configuring the Kubernetes cluster domain
:description: Configure Stackable operators to use a different cluster domain other than 'cluster.local'.
:description: Configure Stackable operators to use a different cluster domain other than 'cluster.local.'.
:dns-custom-nameservers: https://kubernetes.io/docs/tasks/administer-cluster/dns-custom-nameservers/
:dns-pod-service: https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/

Expand All @@ -9,7 +9,9 @@ The cluster domain can be configured using an environment variable `KUBERNETES_C
This environment variable can be configured via the helm values property `kubernetesClusterDomain` during the installation of the operators.

```
helm install <product>-operator stackable-stable/<product>-operator --set kubernetesClusterDomain="my-cluster.local"
helm install <product>-operator stackable-stable/<product>-operator --set kubernetesClusterDomain="my.domain."
```

If the environment variable `KUBERNETES_CLUSTER_DOMAIN` (or the helm property `kubernetesClusterDomain`) are not set / overriden, the operator will default the cluster domain to `cluster.local`.
Note that if you specify a custom cluster domain we recommend adding a trailing dot (`my.domain.` instead of `my.domain`) to reduce DNS requests (see https://github.com/stackabletech/issues/issues/656 for details).

If the environment variable `KUBERNETES_CLUSTER_DOMAIN` (or the helm property `kubernetesClusterDomain`) are not set / overriden, the operator will default the cluster domain to `cluster.local.`.
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