Encrypting Shared Cluster Files

The pki shared by all control plane nodes are distributed via etcd/e2d using e2db, an ORM-like abstraction over etcd. These files should be protected using strong encryption, and e2db provides a feature for encrypting entire tables. The one requirement is that the etcd ca key is provided in the crit configuration:

apiVersion: crit.sh/v1alpha2
kind: ControlPlaneConfiguration
  - "https://${controlPlaneEndpoint.Host}:2379"
  caFile: /etc/kubernetes/pki/etcd/ca.crt
  caKey: /etc/kubernetes/pki/etcd/ca.key
  certFile: /etc/kubernetes/pki/etcd/client.crt
  keyFile: /etc/kubernetes/pki/etcd/client.key

where the important file here is ca.key, since it is only one suitable to use as a data encryption key.