Bug 1828265

We would like to add some text to the 2.3 known issues to cover this bug which will not be fixed until 2.4.

"When configuring the storage class to use for CDI import and upload operations the 'scratchSpaceStorageClass' setting in the cdiconfig object may not be honored.  CDI instead uses the default storage class to allocate this space.  As a workaround, ensure your cluster has a default storage class defined".


+++ This bug was initially created as a clone of Bug #1828198 +++

Description of problem:
Seems that even though scratchSpaceStorageClass is defined, scratch space required operations look for a default storage class to use.

Version-Release number of selected component:
CNV 2.3

How reproducible:
Not sure yet.

Steps to Reproduce:
1. Have one hostpath-provisioner storage class in the environment
2. The storage class is not defined as default (no default storage class)
3. scratchSpaceStorageClass is defined to be hostpath-provisioner
4. upload a data volume:
virtctl image-upload dv dv-name --size=1Gi --image-path=cirros-0.4.0-x86_64-disk.qcow2 --insecure

Actual results:
DataVolume default/dv-name created
Waiting for PVC dv-name upload pod to be ready...
timed out waiting for the condition

Expected results:
Upload to succeed 

Additional info:

After upload failed, I set a default storage class:
$ oc patch storageclass hostpath-provisioner -p '{"metadata": {"annotations": {"storageclass.kubernetes.io/is-default-class": "true"}}}'
storageclass.storage.k8s.io/hostpath-provisioner patched

oc get sc
NAME                             PROVISIONER                        RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
hostpath-provisioner (default)   kubevirt.io/hostpath-provisioner   Delete          WaitForFirstConsumer   false                  2d18h

and tried to upload again:
$ virtctl image-upload dv dv-name --size=1Gi --image-path=cirros-0.4.0-x86_64-disk.qcow2 --insecure
DataVolume default/dv-name created
Waiting for PVC dv-name upload pod to be ready...
Pod now ready
Uploading data to https://cdi-uploadproxy-openshift-cnv.apps.bm-rhel.oc4

 12.13 MiB / 12.13 MiB [===============================================================================================================================================] 100.00% 0s

Uploading data completed successfully, waiting for processing to complete, you can hit ctrl-c without interrupting the progress
Processing completed successfully
Uploading cirros-0.4.0-x86_64-disk.qcow2 completed successfully

$ oc get pvc
NAME      STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS           AGE
dv-name   Bound    pvc-ac2cc14e-2999-4546-8f78-1f7788c1c2f3   916Gi      RWO            hostpath-provisioner   13s

$ oc get dv
NAME      PHASE       PROGRESS   AGE
dv-name   Succeeded              1m


Output for the failed test:
-------------------------------------------------------------------------

$ oc get sc
NAME                   PROVISIONER                        RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
hostpath-provisioner   kubevirt.io/hostpath-provisioner   Delete          WaitForFirstConsumer   false                  2d17h

-------------------------------------------------------------------------

$ oc get pods
NAME                 READY   STATUS    RESTARTS   AGE
cdi-upload-dv-name   0/1     Pending   0          14s

-------------------------------------------------------------------------

$ oc get pod cdi-upload-dv-name -oyaml
apiVersion: v1
kind: Pod
metadata:
  annotations:
    cdi.kubevirt.io/storage.createdByUploadController: "yes"
  creationTimestamp: "2020-04-27T07:46:04Z"
  labels:
    app: containerized-data-importer
    cdi.kubevirt.io: cdi-upload-server
    service: cdi-upload-dv-name
  name: cdi-upload-dv-name
  namespace: default
  ownerReferences:
  - apiVersion: v1
    blockOwnerDeletion: true
    controller: true
    kind: PersistentVolumeClaim
    name: dv-name
    uid: f8e09ecc-7f20-439f-bafe-d5caf7e85a1e
  resourceVersion: "2723602"
  selfLink: /api/v1/namespaces/default/pods/cdi-upload-dv-name
  uid: d3479bd3-4f0e-4132-8a52-440138ef67d8
spec:
  containers:
  - args:
    - -v=1
    env:
    - name: TLS_KEY
      value: |
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        -----END RSA PRIVATE KEY-----
    - name: TLS_CERT
      value: |
        -----BEGIN CERTIFICATE-----
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        -----END CERTIFICATE-----
        -----BEGIN CERTIFICATE-----
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        -----END CERTIFICATE-----
    - name: CLIENT_CERT
      value: |
        -----BEGIN CERTIFICATE-----
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        -----END CERTIFICATE-----
    - name: UPLOAD_IMAGE_SIZE
      value: 1Gi
    - name: CLIENT_NAME
      value: client.upload-server.cdi.kubevirt.io
    image: registry.stage.redhat.io/container-native-virtualization/virt-cdi-uploadserver@sha256:7a6611d2f738c04bcc93f2062c074e8a80a0107be780df46bfe8cb73fc4c2d52
    imagePullPolicy: IfNotPresent
    name: cdi-upload-server
    readinessProbe:
      failureThreshold: 3
      httpGet:
        path: /healthz
        port: 8080
        scheme: HTTP
      initialDelaySeconds: 2
      periodSeconds: 5
      successThreshold: 1
      timeoutSeconds: 1
    resources:
      limits:
        cpu: "0"
        memory: "0"
      requests:
        cpu: "0"
        memory: "0"
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
    - mountPath: /data
      name: cdi-data-vol
    - mountPath: /scratch
      name: cdi-scratch-vol
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: default-token-ctpkk
      readOnly: true
  dnsPolicy: ClusterFirst
  enableServiceLinks: true
  imagePullSecrets:
  - name: default-dockercfg-sfg85
  priority: 0
  restartPolicy: OnFailure
  schedulerName: default-scheduler
  securityContext:
    runAsUser: 0
  serviceAccount: default


apiVersion: cdi.kubevirt.io/v1alpha1
  serviceAccountName: default
  terminationGracePeriodSeconds: 30
  tolerations:
  - effect: NoExecute
    key: node.kubernetes.io/not-ready
    operator: Exists
    tolerationSeconds: 300
  - effect: NoExecute
    key: node.kubernetes.io/unreachable
    operator: Exists
    tolerationSeconds: 300
  volumes:
  - name: cdi-data-vol
    persistentVolumeClaim:
      claimName: dv-name
  - name: cdi-scratch-vol
    persistentVolumeClaim:
      claimName: dv-name-scratch
  - name: default-token-ctpkk
    secret:


apiVersion: cdi.kubevirt.io/v1alpha1
      defaultMode: 420
      secretName: default-token-ctpkk
status:
  conditions:
  - lastProbeTime: null
    lastTransitionTime: "2020-04-27T07:46:04Z"
    message: 'error while running "VolumeBinding" filter plugin for pod "cdi-upload-dv-name":
      pod has unbound immediate PersistentVolumeClaims'
    reason: Unschedulable
    status: "False"
    type: PodScheduled
  phase: Pending
  qosClass: BestEffort

-------------------------------------------------------------------------

$ oc get dv dv-name -oyaml
apiVersion: cdi.kubevirt.io/v1alpha1
kind: DataVolume
metadata:
  creationTimestamp: "2020-04-27T07:46:04Z"
  generation: 2
  name: dv-name
  namespace: default
  resourceVersion: "2723569"
  selfLink: /apis/cdi.kubevirt.io/v1alpha1/namespaces/default/datavolumes/dv-name
  uid: 8ced0050-0d83-41bb-bed5-b7ae2625eef5
spec:
  pvc:
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi
  source:
    upload: {}
status:
  phase: Pending

-------------------------------------------------------------------------

$ oc get pvc
NAME              STATUS    VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS           AGE
dv-name           Pending                                                             11s
dv-name-scratch   Pending                                      hostpath-provisioner   10s

$ oc get cdiconfig config -oyaml
apiVersion: cdi.kubevirt.io/v1alpha1
kind: CDIConfig
metadata:
  creationTimestamp: "2020-04-24T14:09:03Z"
  generation: 13
  labels:
    app: containerized-data-importer
    cdi.kubevirt.io: ""
  name: config
  ownerReferences:
  - apiVersion: cdi.kubevirt.io/v1alpha1
    blockOwnerDeletion: true
    controller: true
    kind: CDI
    name: cdi-kubevirt-hyperconverged
    uid: ae8cfeba-350e-4141-a1d8-22fa7f7ab3ab
  resourceVersion: "2383797"
  selfLink: /apis/cdi.kubevirt.io/v1alpha1/cdiconfigs/config
  uid: 5113a12a-25a5-4859-9f6f-42240b0e45e2
spec:
  scratchSpaceStorageClass: hostpath-provisioner
status:
  defaultPodResourceRequirements:
    limits:
      cpu: "0"
      memory: "0"
    requests:
      cpu: "0"
      memory: "0"
  scratchSpaceStorageClass: hostpath-provisioner
  uploadProxyURL: cdi-uploadproxy-openshift-cnv.apps.bm-rhel.oc4

-------------------------------------------------------------------------

$ oc describe pvc dv-name
Name:          dv-name
Namespace:     default
StorageClass:
Status:        Pending
Volume:
Labels:        app=containerized-data-importer
               cdi-controller=dv-name
Annotations:   cdi.kubevirt.io/storage.pod.phase: Pending
               cdi.kubevirt.io/storage.pod.ready: false
               cdi.kubevirt.io/storage.upload.target:
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:
Access Modes:
VolumeMode:    Filesystem
Mounted By:    cdi-upload-dv-name
Events:
  Type    Reason         Age                From                         Message
  ----    ------         ----               ----                         -------
  Normal  FailedBinding  14s (x7 over 80s)  persistentvolume-controller  no persistent volumes available for this claim and no storage class is set

-------------------------------------------------------------------------

$ oc describe pvc dv-name-scratch
Name:          dv-name-scratch
Namespace:     default
StorageClass:  hostpath-provisioner
Status:        Pending
Volume:
Labels:        app=containerized-data-importer
               cdi-controller=cdi-upload-dv-name
               cdi.kubevirt.io/storage.import.importPvcName=dv-name
Annotations:   <none>
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:
Access Modes:
VolumeMode:    Filesystem
Mounted By:    cdi-upload-dv-name
Events:
  Type    Reason                Age               From                         Message
  ----    ------                ----              ----                         -------
  Normal  WaitForFirstConsumer  2s (x8 over 98s)  persistentvolume-controller  waiting for first consumer to be created before binding

-------------------------------------------------------------------------

$ oc get nodes
NAME                                      STATUS   ROLES    AGE     VERSION
cnv-qe-01.cnvqe.lab.eng.rdu2.redhat.com   Ready    master   2d22h   v1.17.1
cnv-qe-02.cnvqe.lab.eng.rdu2.redhat.com   Ready    master   2d22h   v1.17.1
cnv-qe-03.cnvqe.lab.eng.rdu2.redhat.com   Ready    master   2d22h   v1.17.1
cnv-qe-04.cnvqe.lab.eng.rdu2.redhat.com   Ready    worker   2d19h   v1.17.1
cnv-qe-05.cnvqe.lab.eng.rdu2.redhat.com   Ready    worker   2d20h   v1.17.1
cnv-qe-06.cnvqe.lab.eng.rdu2.redhat.com   Ready    worker   2d20h   v1.17.1

Note: 
I'm having difficulty determining if it's a regression issue because we had similar scenarios, but not a scenario where we have only one storage class and it's not defined as default.

--- Additional comment from Nelly Credi on 2020-04-27 10:26:22 UTC ---

I do not consider this as a blocker, 
but I do think we should add it as a known issue in 2.3 docs
I have added suggeted doc
@Adam, @Natalie please review

--- Additional comment from Natalie Gavrielov on 2020-04-27 12:13:22 UTC ---

I think this issue is not hpp specific.
I assume that it will probably happen regardless of any storage type used.
The main issue here is that scratchSpaceStorageClass configuration is being ignored and not having default storage class defined reveals it.

--- Additional comment from Adam Litke on 2020-04-27 12:50:42 UTC ---

Agreed this looks like an issue with CDI and would therefore be storage agnostic.  I agree that it should be documented for 2.3.