Private clusters

[CecileRobertMichon]

/kind feature

Describe the solution you'd like
[A clear and concise description of what you want to happen.]

Support deploying clusters with no public IP or external load balancer. For reference: https://github.com/Azure/aks-engine/blob/master/docs/topics/features.md#feat-private-cluster.

Once Azure Bastion is implemented, we should document using Azure Bastion + Private clusters. related to #165

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• cluster-api-provider-azure version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[CecileRobertMichon]

/help

[k8s-ci-robot]

@CecileRobertMichon:
This request has been marked as needing help from a contributor.

Please ensure the request meets the requirements listed here.

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In response to this:

/help

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[CecileRobertMichon]

note: we may need to change https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/master/controllers/azurecluster_controller.go#L128 to wait for the private IP instead of the DNS name:

	// TODO: We may need to use azureCluster.Status.Network.APIServerIP.IPAddress
	//       instead when we look at configuring private clusters.

[rbitia]

parity

[k8s-ci-robot]

@rbitia: The label(s) /label parity cannot be applied. These labels are supported: api-review, community/discussion, community/maintenance, community/question, cuj/build-train-deploy, cuj/multi-user, platform/aws, platform/azure, platform/gcp, platform/minikube, platform/other, tide/merge-method-merge, tide/merge-method-rebase, tide/merge-method-squash

In response to this:

/label parity

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[CecileRobertMichon]

1st step is to define what the implementation would look like

/cc @jseely

[CecileRobertMichon]

/assign

[CecileRobertMichon]

kubernetes-sigs/cluster-api#3715