Question

how to safely remove digitalocean csi plugin

hello guys,

i spun up a digitalocean kubernetes with 3 worker nodes. i would prefer to use nfs for persistent volume provisioning. so i created a nfs server and deployed my external provisioner connected to it. i check that everything works well

here is the question: when i get “kubectl get sc” there are 2 default storageClass in my cluster. one my external provisioner, and one digitalocean csi…is it enough to remove the csi daemonset (kubectl delete ds -n kube-system) or any other consideration is needed ?

thank you so much for taking the time to help me


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Bobby Iliev
Site Moderator
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March 17, 2024

Hey!

When removing the DigitalOcean CSI plugin, you want to ensure the process is handled methodically to avoid unintended consequences.

Before you prcoeed I would strongly recommend making sure that you actually have a working backup. You can for example use the DigitalOcean Kubernetes backups with SnapShooter:

https://www.digitalocean.com/blog/doks-backup-snapshooter

Here are some steps, along with command examples, to remove the CSI plugin safely:

  1. Drain Kubernetes nodes (Optional but recommended for maintenance): This is to ensure that no work is being done on the node and no new work will be scheduled on it.

    kubectl drain <node-name> --ignore-daemonsets --delete-emptydir-data
    
  2. Scale down Deployments/StatefulSets: If you have deployments or stateful sets using the CSI driver, scale them down.

    kubectl scale deployment <deployment-name> --replicas=0
    kubectl scale statefulset <statefulset-name> --replicas=0
    
  3. Delete PersistentVolumeClaims (PVCs): Remove PVCs that are provisioned by the DigitalOcean CSI driver.

    kubectl delete pvc <pvc-name>
    

    After deleting the PVCs, make sure that the associated PVs are also deleted. You can check using:

    kubectl get pv
    

    If the PVs still exist and you’re sure they’re not needed anymore (or you’ve backed up the data elsewhere), you can delete them:

    kubectl delete pv <pv-name>
    
  4. Delete the CSI driver components: This includes the controller deployments, CSI driver daemonset, and any associated secrets or other resources.

    kubectl delete -f <csi-driver-deployment-file.yaml>
    kubectl delete ds -n kube-system <csi-driver-daemonset-name>
    kubectl delete secret -n kube-system <csi-driver-secret-name>
    

    These commands require you to know the exact names of the resources deployed by the CSI plugin. You can find them with:

    kubectl get all -n kube-system | grep csi
    
  5. Delete CustomResourceDefinitions (CRDs): If the CSI plugin used CRDs, you’ll need to delete those as well.

    kubectl delete crd <crd-name>
    
  6. Clean up ClusterRoleBindings and ClusterRoles: If the CSI plugin created any cluster roles or bindings, they should also be removed.

    kubectl delete clusterrolebinding <clusterrolebinding-name>
    kubectl delete clusterrole <clusterrole-name>
    
  7. Review Storage Classes: Make sure that your NFS storage class is set as default if you no longer intend to use DigitalOcean’s block storage.

    kubectl patch storageclass <your-nfs-storageclass-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
    
  8. Uncordon the nodes (If you drained them): Once the maintenance is complete, make sure to uncordon the nodes to allow scheduling workloads on them again.

    kubectl uncordon <node-name>
    

Best,

Bobby

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