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Generate a kubeconfig File

How to create a service account and generate a kubeconfig file for attaching an existing cluster

You should create a separate service account when attaching existing Amazon EKS, Azure AKS, or Google GKE Kubernetes clusters. This service account is needed because the kubeconfig files generated from those clusters are not usable out-of-the-box. They call CLI commands, such as aws or gcloud, and use locally-obtained authentication tokens. Having a separate service account also allows you to keep access to the cluster specifics and isolated to DKP Application Manager.

To get started, ensure you have kubectl set up and configured with ClusterAdmin for the cluster you want to connect.

  1. Create the required service account using the command:

    kubectl -n kube-system create serviceaccount kommander-cluster-admin
  2. Configure the new service account for cluster-admin permissions. You can and paste this example ensuring that you use the service account created previously.

    cat << EOF | kubectl apply -f -
    kind: ClusterRoleBinding
      name: kommander-cluster-admin
      kind: ClusterRole
      name: cluster-admin
    - kind: ServiceAccount
      name: kommander-cluster-admin
      namespace: kube-system
  3. Set up the following environment variables with access data needed for producing a new kubeconfig file:

    export USER_TOKEN_NAME=$(kubectl -n kube-system get serviceaccount kommander-cluster-admin -o=jsonpath='{.secrets[0].name}')
    export USER_TOKEN_VALUE=$(kubectl -n kube-system get secret/${USER_TOKEN_NAME} -o=go-template='{{.data.token}}' | base64 --decode)
    export CURRENT_CONTEXT=$(kubectl config current-context)
    export CURRENT_CLUSTER=$(kubectl config view --raw -o=go-template='{{range .contexts}}{{if eq .name "'''${CURRENT_CONTEXT}'''"}}{{ index .context "cluster" }}{{end}}{{end}}')
    export CLUSTER_CA=$(kubectl config view --raw -o=go-template='{{range .clusters}}{{if eq .name "'''${CURRENT_CLUSTER}'''"}}"{{with index .cluster "certificate-authority-data" }}{{.}}{{end}}"{{ end }}{{ end }}')
    export CLUSTER_SERVER=$(kubectl config view --raw -o=go-template='{{range .clusters}}{{if eq .name "'''${CURRENT_CLUSTER}'''"}}{{ .cluster.server }}{{end}}{{ end }}')
  4. Generate a kubeconfig file with these values:

    cat << EOF > kommander-cluster-admin-config
    apiVersion: v1
    kind: Config
    current-context: ${CURRENT_CONTEXT}
    - name: ${CURRENT_CONTEXT}
        cluster: ${CURRENT_CONTEXT}
        user: kommander-cluster-admin
        namespace: kube-system
    - name: ${CURRENT_CONTEXT}
        certificate-authority-data: ${CLUSTER_CA}
        server: ${CLUSTER_SERVER}
    - name: kommander-cluster-admin
        token: ${USER_TOKEN_VALUE}

This procedure produces a file in your current working directory called, kommander-cluster-admin-config. The contents of this file are used in DKP Application Manager to attach the cluster.

Before importing this configuration, you can verify that it is functional by running the following command:

kubectl --kubeconfig $(pwd)/kommander-cluster-admin-config get all --all-namespaces

Then, you can use this kubeconfig to:

If a cluster has limited resources to deploy all the federated platform services, it will fail to stay attached in the DKP UI. If this happens, check if there are any pods that are not getting the resources required.

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