06-data-encryption-keys.md

Generating the Data Encryption Config and Key

Kubernetes stores a variety of data including cluster state, application configurations, and secrets. Kubernetes supports the ability to encrypt cluster data at rest.

In this lab you will generate an encryption key and an encryption config suitable for encrypting Kubernetes Secrets. The commands in this lab must be run on controlplane01

The Encryption Key

Generate an encryption key:

export ENCRYPTION_KEY=$(head -c 32 /dev/urandom | base64)

The Encryption Config File

Create the encryption-config.yaml encryption config file:

envsubst < templates/encryption-config.yaml.template \
  > encryption-config.yaml

Copy the encryption-config.yaml encryption config file to each controller instance:

for instance in controlplane01 controlplane02 controlplane03 ; do
  scp encryption-config.yaml ${instance}:~/
done

Move encryption-config.yaml encryption config file to appropriate directory.

for instance in controlplane01 controlplane02 controlplane03; do
  ssh ${instance} sudo mkdir -p /var/lib/kubernetes/
  ssh ${instance} sudo mv encryption-config.yaml /var/lib/kubernetes/
done

Reference: https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/#encrypting-your-data

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