Vault Agent Kubernetes persistent cache

When kubernetes is configured for the persistent cache type, Vault Agent will optimize the persistent cache specifically for Kubernetes. This type of persistent cache requires a Kubernetes service account token. The service account token is used during encryption and decryption of the persistent cache as an additional integrity check.

The Vault Agent persistent cache file in Kubernetes should only be used for handing off Vault tokens and leases between initialization and sidecar Vault Agent containers. This cache file should be shared using a memory volume between the Vault Agent containers.

If the Vault Agent Injector for Kubernetes is being used, the persistent cache is automatically configured and used if the annotation vault.hashicorp.com/agent-cache-enable: true is set.

Configuration

• service_account_token_file (string: optional) - When type is set to kubernetes, this configures the path on disk where the Kubernetes service account token can be found. Defaults to /var/run/secrets/kubernetes.io/serviceaccount/token.