--- title: Kubernetes Env description: Adapter that extracts information from a Kubernetes environment. location: https://istio.io/docs/reference/config/policy-and-telemetry/adapters/kubernetesenv.html layout: protoc-gen-docs generator: protoc-gen-docs supported_templates: kubernetes aliases: - /docs/reference/config/adapters/kubernetesenv.html number_of_entries: 1 ---

The `kubernetesenv` adapter extracts information from a Kubernetes environment and produces attributes that can be used in downstream adapters.

This adapter supports the kubernetes template.

## Params

Configuration parameters for the kubernetes adapter. These params control the manner in which the kubernetes adapter discovers and generates values related to pod information.

The adapter works by looking up pod information by UIDs (of the form: “kubernetes://pod.namespace”). It expects that the UIDs will be supplied in an input map for three distinct traffic classes (source, destination, and origin).

For all valid UIDs supplied, this adapter generates output values containing information about the related pods.

Field | Type | Description | Required
--- | --- | --- | ---
`kubeconfigPath` | `string` | File path to discover `kubeconfig`. For in-cluster configuration, this should be left unset. For local configuration, this should be set to the path of a `kubeconfig` file that can be used to reach a kubernetes API server. NOTE: The `kubernetesenv` adapter will use the value of the `KUBECONFIG` environment variable in the case where it is set (overriding any value configured through this proto). Default: “” (unset) | No
`cacheRefreshDuration` | `Duration` | Controls the resync period of the Kubernetes cluster info cache. The cache will watch for events and every so often completely resync. This controls how frequently the complete resync occurs. Default: 5 minutes | No
`clusterRegistriesNamespace` | `string` | Namespace of the secret created for multicluster support. Details on multicluster and the Kubernetes secret required to access the remote cluster’s credentials can be found in multicluster install. NOTE: If `cluster_registries_namespace` is not set then the environment variable `POD_NAMESPACE` is checked/used. If `POD_NAMESPACE` is not set then `cluster_registries_namespace` defaults to “istio-system”. Default: “istio-system” | No