Azure Ephemeral Configuration File Definition
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The Azure Bootstrap container creates an Ephemeral K8S cluster on the Azure Cloud platform.
The container requires authentication credentials and other information about the cluster to deploy.
It requires a YAML configuration file with the format provided below.

<YAML>
apiVersion: v1
kind: AzureConfig
metadata:
    name: <Ephemeral K8S cluster name>
credentials:
    tenant: <Azure Subscription Tenant ID>
    client: <Azure Subscription Service Principal ID>
    secret: <Azure Subscription Service Principal Secret>
spec:
    resourceGroup: <Azure Resource Group Name>
    region: <Azure Region, e.g., centralus>
    cluster:
        k8sVersion: <Kubernetes version, e.g., 1.21.2>
        vmSize: <Azure Compute VM Type, e.g., Standard_B2s>
        replicas: <Node Replica Number for the cluster. Default is 1>
        kubeconfig: <Kubernetes version, e.g., 1.21.2>
</YAML>

It also accepts the JSON file format.

<JSON>
{
    "apiVersion":"v1",
    "kind":"AzureConfig",
    "metadata":{
        "name":"<Ephemeral K8S cluster name>"
    },
    "credentials":{
        "tenant":"<Azure Subscription Tenant ID>",
        "client":"<Azure Subscription Service Principal ID>",
        "secret":"<Azure Subscription Service Principal Secret>"
    },
    "spec":{
        "resourceGroup":"<Azure Resource Group Name>",
        "region":"<Azure Region, e.g., centralus>",
        "cluster":{
            "k8sVersion":"<Kubernetes version, e.g., 1.21.2>",
            "vmSize":"<Azure Compute VM Type, e.g., Standard_B2s>",
            "replicas":<Node Replica Number for the cluster>,
            "kubeconfig":"<Kubernetes version, e.g., 1.21.2>"
        }
    }
}
</JSON>

The expected location for the Azure bootstrap configuration file is dictated by the "volume" mount
specified in the Airship config file (bootstrapInfo.ephemeral.container.volume).
For example, /home/esidshi/.airship folder and shown in the snippet below:

<Snippet>
apiVersion: airshipit.org/v1alpha1
bootstrapInfo:
  ephemeral:
    container:
      volume: /home/esidshi/.airship:/kube
</Snippet>