Configuring the Kubernetes cluster domain

Stackable operators allow the configuration of a non-default cluster domain as described in Customizing DNS Service (and more in DNS for Services and Pods).

The cluster domain can be configured using an environment variable KUBERNETES_CLUSTER_DOMAIN set on the operators. 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.domain"

You can also specify a custom cluster domain with a trailing dot (my.domain. instead of my.domain) to reduce the number of DNS requests under certain conditions (see https://github.com/stackabletech/issues/issues/656 for details). Note however that support for this is still considered experimental.

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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