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 Encryption Key

Generate an encryption key:

$EncryptionKey = (New-Guid).ToString().Replace('-','')

The Encryption Config File

Create the encryption-config.yaml encryption config file:

@"
kind: EncryptionConfig
apiVersion: v1
resources:
  - resources:
      - secrets
    providers:
      - aescbc:
          keys:
            - name: key1
              secret: $EncryptionKey
      - identity: {}
"@ | Out-File -Encoding ascii encryption-config.yaml

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

foreach ($i in (0..2)) {
  $InstanceName = "controller-$i"
  $InstanceExtIp = (Get-Ec2Instance -ProfileName $env:AWS_PROFILE `
    -Filter @(
      @{
        Name = 'tag:Name'
        Values = $InstanceName
      }
      @{
        Name = 'instance-state-name'
        Values = 'running'
      }      
    )
  ).Instances.PublicIpAddress

  Write-Host "Copying encryption config to ${InstanceName}:"
  scp -i kubernetes.id_rsa encryption-config.yaml "ubuntu@${InstanceExtIp}:~/"
}

Results:

Copying encryption config to controller-0:
encryption-config.yaml
Copying encryption config to controller-1:
encryption-config.yaml
Copying encryption config to controller-2:
encryption-config.yaml

Next: Bootstrapping the etcd Cluster