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disk-resizer.md

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Alibaba Cloud Disk Resizer Plugin

Overview

Aliyun EBS support to expand size of disk, this feature will show how to resize ebs in kubernetes platform.

The CSI-Resizer is Alpha feature in k8s 1.14, Beta feature in k8s 1.16+, GA in k8s 1.24+

Requirements

Working Disk CSI driver, Please refer to the disk driver doc for details.

Usage

1. Create pvc with Disk

Create pvc, using disk volume.

kubectl get pvc

Expected output:

NAME           STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS           AGE
pvc-disk-new   Bound    pvc-8db30f1a-ad23-11e9-ae51-00163e105050   20Gi       RWO            alicloud-disk-expand   7s

kubectl get pv

Expected output:

NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                  STORAGECLASS           REASON   AGE
pvc-8db30f1a-ad23-11e9-ae51-00163e105050   20Gi       RWO            Retain           Bound    default/pvc-disk-new   alicloud-disk-expand            15s

2. Create pod with disk

kubectl get pod
NAME                              READY   STATUS    RESTARTS   AGE
dynamic-create-6d5dc9bb7d-lvhgz   1/1     Running   0          23s

current, disk size is 20G；

kubectl exec dynamic-create-6d5dc9bb7d-lvhgz df | grep data

Expected output:

/dev/vdd        20511312    45080  20449848   1% /data

3. Expand pvc from 20G to 30G:

Expand pvc from 20G to 30G

kubectl patch pvc pvc-disk-new -p '{"spec":{"resources":{"requests":{"storage":"30Gi"}}}}'

phase1: resizer finish disk expand, pvc is in FileSystemResizePending;

kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                  STORAGECLASS           REASON   AGE
pvc-8db30f1a-ad23-11e9-ae51-00163e105050   30Gi       RWO            Retain           Bound    default/pvc-disk-new   alicloud-disk-expand            5m1s

Name:          pvc-disk-new
Namespace:     default
StorageClass:  alicloud-disk-expand
Status:        Bound
Volume:        pvc-8db30f1a-ad23-11e9-ae51-00163e105050
Labels:        <none>
Annotations:   pv.kubernetes.io/bind-completed: yes
               pv.kubernetes.io/bound-by-controller: yes
               volume.beta.kubernetes.io/storage-provisioner: diskplugin.csi.alibabacloud.com
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      20Gi
Access Modes:  RWO
VolumeMode:    Filesystem
Conditions:
  Type                      Status  LastProbeTime                     LastTransitionTime                Reason  Message
  ----                      ------  -----------------                 ------------------                ------  -------
  FileSystemResizePending   True    Mon, 01 Jan 0001 00:00:00 +0000   Tue, 23 Jul 2019 16:31:25 +0800           Waiting for user to (re-)start a pod to finish file system resize of volume on node.

4. Expand FileSystem with restart pod:

phase2: restart Pod, expand filesystem;

kubectl delete pod dynamic-create-6d5dc9bb7d-lvhgz

Check pvc status

kubectl get pvc

Expected output:

NAME           STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS           AGE
pvc-disk-new   Bound    pvc-8db30f1a-ad23-11e9-ae51-00163e105050   30Gi       RWO            alicloud-disk-expand   6m13s

Run df to check the disk size

kubectl exec -ti dynamic-create-6d5dc9bb7d-5gzq2 df | grep data

Expected output:

/dev/vdd        30832548    45036  30771128   1% /data

Troubleshooting