Import Existing Cluster built on Harvester VM

Rancher allows you to import existing Harvester VMs in which you installed Kubernetes.

Deployment

Prerequisites

  • The Kubernetes cluster is built on top of Harvester VMs.

Deploy Guest Clusters on Harvester VMs

  1. Generate the csi-driver cloud-config file using the generate_addon_csi.sh script, which is available in the harvester/harvester-csi-driver repository.

    Example:

    1. ./generate_addon_csi.sh <serviceaccount name> <namespace> RKE2

    The generated output will be similar to the following one:

    1. ########## cloud-config ############
    2. apiVersion: v1
    3. clusters:
    4. - cluster: <token>
    5.     server: https://<YOUR HOST HARVESTER VIP>:6443
    6.   name: default
    7. contexts:
    8. - context:
    9.     cluster: default
    10.     namespace: default
    11.     user: rke2-guest-01-default-default
    12.   name: rke2-guest-01-default-default
    13. current-context: rke2-guest-01-default-default
    14. kind: Config
    15. preferences: {}
    16. users:
    17. - name: rke2-guest-01-default-default
    18.   user:
    19.     token: <token>
    21. ########## cloud-init user data ############
    22. write_files:
    23.   - encoding: b64
    24.     content: 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
    25.     owner: root:root
    26.     path: /var/lib/rancher/rke2/etc/config-files/cloud-provider-config
    27.     permissions: '0644'

  2. Generate the cloud-provider cloud-config using the generate_addon.sh script, which is available in the harvester/cloud-provider-harvester repository.

    Example:

    1. ./generate_addon.sh <serviceaccount name> <namespace>

    The generated output will be similar to the following one: The output will look as follows:

    1. ########## cloud config ############
    2. apiVersion: v1
    3. clusters:
    4. - cluster:
    5.     certificate-authority-data: <CACERT>
    6.     server: https://HARVESTER-ENDPOINT/k8s/clusters/local
    7.   name: local
    8. contexts:
    9. - context:
    10.     cluster: local
    11.     namespace: default
    12.     user: harvester-cloud-provider-default-local
    13.   name: harvester-cloud-provider-default-local
    14. current-context: harvester-cloud-provider-default-local
    15. kind: Config
    16. preferences: {}
    17. users:
    18. - name: harvester-cloud-provider-default-local
    19.   user:
    20.     token: <TOKEN>
    22. ########## cloud-init user data ############
    23. write_files:
    24. - encoding: b64
    25.   content: <CONTENT>
    26.   owner: root:root
    27.   path: /etc/kubernetes/cloud-config
    28.   permissions: '0644'

  3. Create VM with two cloud-config files.

    VM with cloud-config

  4. Install RKE2 in the VM.

    1. sudo mkdir -p /etc/rancher/rke2
    2. echo "cni: calico
    3. disable-kube-proxy: false
    4. etcd-expose-metrics: false" | sudo tee /etc/rancher/rke2/config.yaml
    5. curl -sfL https://get.rke2.io | sudo sh -
    6. sudo systemctl enable rke2-server.service
    7. sudo systemctl start rke2-server.service

  5. Verify that RKE2 is running in the VM.

    1. sudo /var/lib/rancher/rke2/bin/kubectl --kubeconfig /etc/rancher/rke2/rke2.yaml get nodes

  6. Import the VM into Rancher.

    On the Rancher UI, go to Cluster Management > Clusters > Import Existing > Generic > Create.

    Import Exisging Cluster

    1. # Run the command in the VM
    2. curl --insecure -sfL https://192.168.0.181:6443/v3/import/g5p2g2gtxw4564nktdl4nr5cwwvtwqp9zxd6dmhm5nc7vpnxmr9cfk_c-m-mzf28skd.yaml | sudo /var/lib/rancher/rke2/bin/kubectl --kubeconfig /etc/rancher/rke2/rke2.yaml apply -f -

  7. Install the Harvester Cloud Provider.

    On the RKE2 Cluster Dashboard, go to Apps > Charts > Harvester Cloud Provider > Install.

  8. Install the Harvester CSI Driver.

    On the RKE2 Cluster Dashboard, go to Apps > Charts > Harvester CSI Driver > Install.