HOWTO - Increase Volume Size

Enterprise Applicable to Enterprise tier only

As an operator, I may need to resize a volume. This document describes how to resize the usage of user volumes, group volumes, and PV data volumes.

Caution: The volume size can only be increased and cannot be rolled back after resizing.

Prerequisites

1. Can access your Kubernetes cluster by kubectl

2. Basic understanding of kuberentes storage classes, PersistentVolume (PV) , and PersistentVolumeClaim (PVC).

3. Your storage class can enforce storage size. If you use local storage or NFS client as storage, the volume size cannot be enforced. To resize volume is even not applicable.

4. The storage class of your PVC allows volume expansion. You can check by the following command.

   $ kubectl get storageclass
   NAME            PROVISIONER                    RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
   gp2 (default)   kubernetes.io/aws-ebs          Delete          WaitForFirstConsumer   true                   104d
   

   For more information, please see Resizing Persistent Volumes using Kubernetes

Resize User Volume

1. Find the PVC of the user volume claim-<username>.

   $ kubectl -n hub get pvc
   NAME            STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
   claim-phadmin   Bound    pvc-86331a97-b736-490c-be72-7ef5c6cad47a   20Gi       RWO            gp2            102d
   

2. Check if the storage class of the PVC allows volume expansion

   $ kubectl get storageclass <storage-class>
   NAME            PROVISIONER                    RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
   gp2 (default)   kubernetes.io/aws-ebs          Delete          WaitForFirstConsumer   true                   104d
   

3. Resize the PVC by the following command

   kubectl -n hub patch pvc claim-<username> -p '{"spec":{"resources":{"requests":{"storage":"40Gi"}}}}}'
   

Resize Group Volume

1. Find the PVC named project-<group>. If the storage class of the PVC is not empty, go to step 2 to resize this PVC.

   $ kubectl -n hub get pvc
   NAME                         STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
   project-phusers              Bound    pvc-0c62598b-c9fe-49d4-910f-b0c7f6269636   1Gi        RWX            efs            74d
   

   Otherwise, the PVC is binding an NFS PV pointing to an NFS server. Please find the PVC named data-nfs-project-<group>-0, which is the backed PVC for the NFS server.

   $ kubectl -n hub get pvc
   NAME                         STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
   project-phusers              Bound    hub-nfs-project-phusers                    1Gi        RWX                           74d
   data-nfs-project-phusers-0   Bound    pvc-0c62598b-c9fe-49d4-910f-b0c7f6269636   1Gi        RWO            gp2            74d
   

2. Check if the storage class of the PVC allows volume expansion

   $ kubectl get storageclass <storageclass>
   NAME            PROVISIONER                    RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
   gp2 (default)   kubernetes.io/aws-ebs          Delete          WaitForFirstConsumer   true                   104d
   

3. Resize the PVC by the following command

   kubectl -n hub patch pvc <pvcname> -p '{"spec":{"resources":{"requests":{"storage":"50Gi"}}}}}'
   

Resize PV data volume

1. Find the PVC named dataset-<dataset>. If the storage class of the PVC is not empty, go to step 2 to resize this PVC.

   $ kubectl -n hub get pvc
   NAME                         STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
   dataset-test                 Bound    pvc-0c62598b-c9fe-49d4-910f-b0c7f6269636   1Gi        RWX            efs            74d
   

   Otherwise, the PVC is binding an NFS PV pointing to an NFS server. Please find the PVC named data-nfs-dataset-<dataset>-0, which is the backed PVC for the NFS server.

   $ kubectl -n hub get pvc
   NAME                         STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
   dataset-test                 Bound    hub-nfs-project-phusers                    1Gi        RWX                           74d
   data-nfs-dataset-test-0      Bound    pvc-0c62598b-c9fe-49d4-910f-b0c7f6269636   1Gi        RWO            gp2            74d
   

2. Check if the storage class of the PVC allows volume expansion

   $ kubectl get storageclass <storageclass>
   NAME            PROVISIONER                    RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
   gp2 (default)   kubernetes.io/aws-ebs          Delete          WaitForFirstConsumer   true                   104d
   

3. Resize the PVC by the following command

   kubectl -n hub patch pvc <pvcname> -p '{"spec":{"resources":{"requests":{"storage":"50Gi"}}}}}'