kubernetes-the-hard-way/docs/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 chapter, you will generate an encryption key and an encryption config suitable for encrypting Kubernetes Secrets.

All procedures in this chapter should be done in client-1.

The Encryption Key

Generate an encryption key:

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

The Encryption Config File

Create the encryption-config.yaml encryption config file:

$ cat > encryption-config.yaml <<EOF
kind: EncryptionConfig
apiVersion: v1
resources:
  - resources:
      - secrets
    providers:
      - aescbc:
          keys:
            - name: key1
              secret: ${ENCRYPTION_KEY}
      - identity: {}
EOF

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

$ for num in 1 2 3; do
  scp -i ~/.ssh/id_rsa-k8s encryption-config.yaml ${USER}@10.240.0.1${num}:~/
done

Next: Bootstrapping the etcd Cluster