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Microsoft Azure Container Service Engine - Key vault referencing for k8s parameters

Overview

ACS-Engine enables you to retrieve the following k8s deployment parameters from Microsoft Azure KeyVault:

  • certificateProfile
    • apiServerCertificate
    • apiServerPrivateKey
    • caCertificate
    • caPrivateKey
    • clientCertificate
    • clientPrivateKey
    • kubeConfigCertificate
    • kubeConfigPrivateKey
    • etcdServerCertificate
    • etcdServerPrivateKey
    • etcdClientCertificate
    • etcdClientPrivateKey
    • etcdPeerCertificates (length of array depends on number of master nodes)
    • etcdPeerPrivateKeys (length of array depends on number of master nodes)
  • servicePrincipalProfile* (a special case)

Certificate Profile

For parameters referenced in the properties.certificateProfile section of the api model file, the value of each field should be formatted as:

{
  "<PARAMETER>": "/subscriptions/<SUB_ID>/resourceGroups/<RG_NAME>/providers/Microsoft.KeyVault/vaults/<KV_NAME>/secrets/<NAME>[/<VERSION>]"
}

where:

  • SUB_ID - is the subscription ID of the keyvault
  • RG_NAME - is the resource group of the keyvault
  • KV_NAME - is the name of the keyvault
  • NAME - is the name of the secret in the keyvault
  • VERSION (optional) - is the version of the secret (default: the latest version)

Service Principal Profile

For the service principal profile secret, the keyvault is referenced differently. If embedding the secret as plain text, the secret is set in properties.servicePrincipalProfile.secret.

If the secret is stored in a keyvault, it can be referenced as follows:

{
  "servicePrincipalProfile": {
    "clientId": "97ffd212-b56b-430a-97bd-9d15cc01ed43",
      "secret": "",
      "keyvaultSecretRef": {
        "vaultID": "/subscriptions/<SUB_ID>/resourceGroups/<RG_NAME>/providers/Microsoft.KeyVault/vaults/<KV_NAME>",
        "secretName": "<NAME>",
        "version": "<VERSION>"
    }
  }
}

The version field is optional.

Example

The example kubernetes.json shows you how to refer deployment parameter to a secret in a keyvault.

Important The secrets in the KeyVault for the Certificates and Private Keys must be Base64 encoded, and all on a single line -- this means you can't use the --encoding base64 option of the Azure CLI. Instead you should use the base64 command:

  # On OSX base64 will not wrap by default
  az keyvault secret set --vault-name KV_NAME --name NAME --value "$(cat ca.crt | base64 --break=0)"

  # On Linux it will wrap at 76 chars by default
  az keyvault secret set --vault-name KV_NAME --name NAME --value "$(cat ca.crt | base64 --wrap=0)"

KeyVault Configuration

To enable Azure Resource Manager to retrieve the secrets from the KeyVault, template deployment must be enabled on the KeyVault:

az keyvault update -g $RG_NAME -n $KV_NAME --enabled-for-template-deployment