Bootstrap

Prepare to deploy Kubernetes clusters for AKS

To create Kubernetes clusters, Konvoy uses Cluster API (CAPI) controllers. These controllers run on a Kubernetes cluster. To get started, you need a bootstrap cluster. By default, Konvoy creates a bootstrap cluster for you in a Docker container using the Kubernetes-in-Docker (KIND) tool.

Prerequisites

Before you begin, you must:

  • Complete the steps in Prerequisites.
  • Ensure the dkp binary can be found in your $PATH.

Bootstrap Cluster Lifecycle Services

  1. If an HTTP proxy is required for the bootstrap cluster, set the local http_proxy, https_proxy, and no_proxy environment variables. They are copied into the bootstrap cluster.

  2. Create a bootstrap cluster:

    dkp create bootstrap --kubeconfig $HOME/.kube/config

    INFO[2021-12-22T13:51:34-05:00] Creating bootstrap cluster                    src="bootstrap/bootstrap.go:148"
INFO[2021-12-22T13:53:09-05:00] Created bootstrap controllers                 src="bootstrap/controllers.go:111"
INFO[2021-12-22T13:53:09-05:00] Bootstrap controllers are ready               src="bootstrap/controllers.go:115"
INFO[2021-12-22T13:53:09-05:00] Initializing Tigera operator                  src="bootstrap/clusterresourceset.go:37"
INFO[2021-12-22T13:53:09-05:00] Created/Updated Tigera operator               src="bootstrap/clusterresourceset.go:42"
INFO[2021-12-22T13:53:09-05:00] Initializing AWS EBS CSI CustomResourceSet    src="bootstrap/clusterresourceset.go:95"
INFO[2021-12-22T13:53:09-05:00] Created/Updated AWS EBS CSI CustomResourceSet  src="bootstrap/clusterresourceset.go:100"
INFO[2021-12-22T13:53:09-05:00] Initializing Azure Disk CSI CustomResourceSet  src="bootstrap/clusterresourceset.go:102"
INFO[2021-12-22T13:53:09-05:00] Created Azure Disk CustomResourceSet          src="bootstrap/clusterresourceset.go:107"
INFO[2021-12-22T13:53:09-05:00] Initializing Local Volume Provisioner CustomResourceSet  src="bootstrap/clusterresourceset.go:109"
INFO[2021-12-22T13:53:09-05:00] Created/Updated Local Volume Provisioner CustomResourceSet  src="bootstrap/clusterresourceset.go:114"
INFO[2021-12-22T13:53:09-05:00] Initializing Cluster Autoscaler CustomResourceSet  src="bootstrap/clusterresourceset.go:181"
INFO[2021-12-22T13:53:09-05:00] Created/Updated Cluster Autoscaler CustomResourceSet  src="bootstrap/clusterresourceset.go:186"
INFO[2021-12-22T13:53:09-05:00] Initializing Node Feature Discovery CustomResourceSet  src="bootstrap/clusterresourceset.go:239"
INFO[2021-12-22T13:53:09-05:00] Created/Updated Node Feature Discovery CustomResourceSet  src="bootstrap/clusterresourceset.go:244"
INFO[2021-12-22T13:53:09-05:00] Initializing NVIDIA GPU Feature Discovery CustomResourceSet  src="bootstrap/clusterresourceset.go:297"
INFO[2021-12-22T13:53:09-05:00] Created/Updated NVIDIA GPU Feature Discovery CustomResourceSet  src="bootstrap/clusterresourceset.go:302"

    Konvoy creates a bootstrap cluster using KIND as a library. Konvoy then deploys the following Cluster API providers on the cluster:

    Konvoy waits until the controller-manager and webhook deployments of these providers are ready. List these deployments using this command:

    kubectl get --all-namespaces deployments -l=clusterctl.cluster.x-k8s.io

    NAMESPACE                           NAME                                            READY   UP-TO-DATE   AVAILABLE   AGE
capa-system                         capa-controller-manager                         1/1     1            1           5m23s
capi-kubeadm-bootstrap-system       capi-kubeadm-bootstrap-controller-manager       1/1     1            1           5m33s
capi-kubeadm-control-plane-system   capi-kubeadm-control-plane-controller-manager   1/1     1            1           5m29s
capi-system                         capi-controller-manager                         1/1     1            1           5m36s
cappp-system                        cappp-controller-manager                        1/1     1            1           5m12s
capz-system                         capz-controller-manager                         1/1     1            1           5m17s
cert-manager                        cert-manager                                    1/1     1            1           5m56s
cert-manager                        cert-manager-cainjector                         1/1     1            1           5m56s
cert-manager                        cert-manager-webhook                            1/1     1            1           5m56s

    Konvoy then creates additional resources for Cluster API to apply to every new cluster. The resources, called ClusterResourceSets, contain complete YAML manifests to deploy essential cluster applications, such as the Calico Container Networking Interface (CNI) implementation, and Container Storage Interface (CSI) implementations for various infrastructure APIs. List ClusterResourceSets using this command:

    kubectl get clusterresourceset

    NAME                       AGE
aws-ebs-csi                4m57s
azure-disk-csi             4m57s
cluster-autoscaler         4m57s
local-volume-provisioner   4m57s
node-feature-discovery     4m57s
nvidia-feature-discovery   4m57s
tigera-operator            4m57s

    A ClusterResourceSet object defines selectors that match against cluster labels, and a reference to a ConfigMap. The ConfigMap contains a YAML manifest. When a cluster with matching labels is created, the YAML manifest is applied to the cluster. The manifest is applied only once, when the cluster is created.

    For example, this is the node-feature-discovery ClusterResourceSet, which is now deployed by Konvoy from the above actions:

    apiVersion: addons.cluster.x-k8s.io/v1alpha4
kind: ClusterResourceSet
metadata:
   name: node-feature-discovery
spec:
  clusterSelector:
      matchExpressions:
      - key: konvoy.d2iq.io/provider
         operator: Exists
  resources:
  - kind: ConfigMap
     name: node-feature-discovery
  strategy: ApplyOnce

    Konvoy defines the selectors and sets the correct labels on the Cluster objects. For a more detailed explanation of how ClusterResourceSets work, see the Extension Proposal.

When complete, you can create the new cluster.