Bug 1535270

Summary: PV and PVC bound failed event message is not clear
Product: OpenShift Container Platform Reporter: Qin Ping <piqin>
Component: StorageAssignee: Jan Safranek <jsafrane>
Status: CLOSED ERRATA QA Contact: Qin Ping <piqin>
Severity: low Docs Contact:
Priority: unspecified    
Version: 3.9.0CC: aos-bugs, aos-storage-staff, jsafrane
Target Milestone: ---   
Target Release: 3.9.0   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: No Doc Update
Doc Text:
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Clone Of: Environment:
Last Closed: 2018-03-28 14:19:53 UTC Type: Bug
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Qin Ping 2018-01-17 01:40:30 UTC
Description of problem:
Block volumeMode PVC prebound a Filesystem volumeMode PV, bound failed as expected, but event message is not clear.

Version-Release number of selected component (if applicable):
oc v3.9.0-0.20.0
openshift v3.9.0-0.20.0
kubernetes v1.9.1+a0ce1bc657


How reproducible:
Always

Steps to Reproduce:
1. Create a Filesystem volumeMode PV
2. Create a Block volumeMode PVC prebound the PV created above
3. Check the PVC and PV

Actual results:
PVC is not bound to PV, but event message is not correct.
Warning  VolumeMismatch  5s    persistentvolume-controller  Volume's size is smaller than requested or volume's class does not match with claim

Expected results:
Volume's volumeMode does not match with claim?

Additional info:
# cat pv-fs.yaml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: fs-pv
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  volumeMode: Filesystem
  persistentVolumeReclaimPolicy: Retain
  fc:
    targetWWNs: ["500a0981891b8dc5", "500a0981991b8dc5"]
    lun: 2
    readOnly: false

# cat pvc-block.json 
{
    "apiVersion": "v1",
    "kind": "PersistentVolumeClaim",
    "metadata": {
        "name": "claim-block"
    },
    "spec": {
        "accessModes": [ "ReadWriteOnce" ],
        "volumeName" : "fs-pv",
        "volumeMode" : "Block",
        "resources": {
            "requests": {
                "storage": "5Gi"
            }
        }
    }
}

# oc describe pvc
Name:          claim-block
Namespace:     piqin
StorageClass:  
Status:        Pending
Volume:        fs-pv
Labels:        <none>
Annotations:   <none>
Finalizers:    []
Capacity:      0
Access Modes:  
VolumeMode:    Block
Events:
  Type     Reason          Age   From                         Message
  ----     ------          ----  ----                         -------
  Warning  VolumeMismatch  5s    persistentvolume-controller  Volume's size is smaller than requested or volume's class does not match with claim

Comment 1 Jan Safranek 2018-01-19 14:39:45 UTC
I agree that the message is confusing, I'll change it to:
"Cannot bind to requested volume "fs-pv": %s", where %s is one of:
- "requested PV is too small"
- "storageClasseNames do not match"
- "incompatible volumeMode"
- "error checking volumeMode: api defaulting for volumeMode failed" (this should not ever happen)

Comment 2 Jan Safranek 2018-01-19 14:47:06 UTC
upstream PR: https://github.com/kubernetes/kubernetes/pull/58522

Comment 3 Jan Safranek 2018-01-25 10:24:13 UTC
Origin 3.9 PR: https://github.com/openshift/origin/pull/18284

Comment 4 Jan Safranek 2018-02-01 11:12:26 UTC
The PR was merged yesterday.

Comment 6 Qin Ping 2018-02-05 05:25:23 UTC
Verified in OCP v3.9.0-0.36.0

Comment 9 errata-xmlrpc 2018-03-28 14:19:53 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0489