Longhorn: [Question] How to create PVC from snapshot or backup with yalm file?

[hillbun]

is it possible to create new PVC from snapshot or backup with yalm file?

[meldafrawi]

You can create StorageClass, and provide backup URL to fromBackup parameter, then create a PVC from that StorageClass, new Longhorn volume gets created, and will restore data from the specified backup

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: <STORAGE_CALSS_NAME>
provisioner: driver.longhorn.io
allowVolumeExpansion: true
parameters:
  numberOfReplicas: "3"
  staleReplicaTimeout: "2880" # 48 hours in minutes
  fromBackup: "<BACKUP_URL>"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: <PVC_NAME>
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: <STORAGE_CALSS_NAME>
  resources:
    requests:
      storage: <PVC_SIZE>

[hillbun]

@meldafrawi

what's format in yalm file?

[meldafrawi]

@hillbun
In backup page, select volume backup, and from right drop down menu of the backup, you click on Get URL

[hillbun]

@meldafrawi

But I can not define pvc and pod in a yalm file, it will cause error:

Warning FailedAttachVolume 1s (x5 over 9s) attachdetach-controller AttachVolume.Attach failed for volume "pvc-2feb8497-526e-4556-b927-cea5b282b613" : rpc error: code = Internal desc = Action [attach] not available on [&{pvc-2feb8497-526e-4556-b927-cea5b282b613 volume map[self:http://longhorn-backend:9500/v1/volumes/pvc-2feb8497-526e-4556-b927-cea5b282b613] map[]}]

I must write 2 yalm file for pvc and pod to avoid this error.

any advice?

[shuo-wu]

I guess the volume created from the backup takes a long time, which exceeds the max wait interval of pod volume attachment. Then the pod keeps retrying attaching the volume and report this error.
Creating a volume from backup means Longhorn volume needs to restore data from backup. It may be time-consuming. And we cannot config the wait interval for the pod attachment. Hence now I think it's better to create the volume/PVC and wait for the volume ready first. Then you can create a pod with the PVC.

[stale[bot]]

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