Bug 1451008

Summary:	Pods fail to start if they specify a file as a volume subPath to mount
Product:	OpenShift Container Platform	Reporter:	Matthew Wong <mawong>
Component:	Storage	Assignee:	Matthew Wong <mawong>
Status:	CLOSED ERRATA	QA Contact:	Wenqi He <wehe>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	3.6.1	CC:	aos-bugs, bchilds, jhou, smunilla
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1451007	Environment:
Last Closed:	2017-08-10 05:24:06 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1451007
Bug Blocks:

Description Matthew Wong 2017-05-15 14:44:43 UTC

+++ This bug was initially created as a clone of Bug #1451007 +++

Description of problem:

Pods fail to start if they specify a file as a volume subPath to mount

Version-Release number of selected component (if applicable):

How reproducible:

Always

Steps to Reproduce:
1. Create a pod that mounts a volume's file using subPath

Actual results:

Pod reports "mkdir" error and fails to start

Expected results:

Pod enters Running state

--- Additional comment from Matthew Wong on 2017-05-15 10:44:19 EDT ---

https://github.com/openshift/origin/pull/14193

Comment 1 Matthew Wong 2017-06-01 13:28:49 UTC

PR: https://github.com/openshift/origin/pull/14193

Comment 3 Wenqi He 2017-06-13 07:36:43 UTC

Tested on below version:
openshift v3.6.105
kubernetes v1.6.1+5115d708d7

The pod could be started with subpath:
$ cat pod.json
{
    "apiVersion": "v1",
    "kind": "Pod",
    "metadata": {
        "name": "mypod1",
        "labels": {
            "name": "frontendhttp"
        }
    },
    "spec": {
        "containers": [{
            "name": "myfrontend",
            "image": "jhou/hello-openshift",
            "imagePullPolicy": "IfNotPresent",
            "ports": [{
                "containerPort": 80,
                "name": "http-server"
            }],
            "volumeMounts": [{
                "mountPath": "/opt/wehe",
                "subPath": "wehe",
                "name": "pvol"
            }]
        }],
        "volumes": [{
            "name": "pvol",
            "nfs": {
                "server": "XXX",
                "path": "/",
                "readOnly": false
            }
        }]
    }
}

$ oc get pods
mypod1       1/1       Running   0          1m

[root@mypod1 opt]# ll
total 0
drwxrwxrwx. 2 root root 6 Jun 13 07:31 wehe

Comment 5 errata-xmlrpc 2017-08-10 05:24:06 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/RHEA-2017:1716