Commit Graph

22276 Commits

Author SHA1 Message Date
Kubernetes Submit Queue
10dc1aac61 Merge pull request #46332 from feiskyer/Seccomp
Automatic merge from submit-queue

Kubelet CRI: move seccomp from annotations to security context

**What this PR does / why we need it**:

This is the final step for #39130, which moves seccomp from annotations to linux container security context. And it also fixes #36997 by set the full seccomp profile path for node-installed profiles.

Note it doesn't include spec the seccomp profile format, which should be addressed at #39128. And a following PR is required for implementing in kuberuntime and dockershim.

**Which issue this PR fixes** 

Fixes #39130
Fixes #36997

**Special notes for your reviewer**:

**Release note**:
```release-note
Kubelet CRI: move seccomp from annotations to security context.
```
2017-07-17 10:16:52 -07:00
Kubernetes Submit Queue
ce91f2ab26 Merge pull request #48909 from caesarxuchao/owners
Automatic merge from submit-queue

Add approvers to pkg/controller/garbagecollector

cc @deads2k
2017-07-17 08:49:23 -07:00
Kubernetes Submit Queue
d54ab221cd Merge pull request #48991 from smarterclayton/cleanup_restclient
Automatic merge from submit-queue

Remove old, core/v1 specific constructs from RESTClient

Now that metav1 is abstracted from the APIs, RESTClient should also be agnostic to the core API.

* Remove `LabelSelectorParam` and `FieldSelectorParam` - use `VersionedParams` with `ListOptions`
* Remove `UintParam`
* Remove all legacy field selector logic from `VersionedParams` - ParameterCodec now handles that
* Remove special parameters (like `timeout`) which is no longer set by most clients
2017-07-17 06:50:18 -07:00
Kubernetes Submit Queue
1170b7c2a1 Merge pull request #47087 from ravisantoshgudimetla/node_controller_flake
Automatic merge from submit-queue

Changes to fix the node eviction flake

**What this PR does / why we need it**:

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #39975

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```
2017-07-17 02:31:51 -07:00
Kubernetes Submit Queue
4b4e91977d Merge pull request #48274 from superbrothers/fix-to-override-kubectl-flags
Automatic merge from submit-queue (batch tested with PRs 48381, 48274)

Fix completions for --namespace to override kubectl flags

**What this PR does / why we need it**:
This PR fixes completions for --namespace to override kubectl flags. Due to not using __kubectl_parse_get, __kubectl_get_namespaces doesn't support to override kubectl flags.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```
2017-07-16 19:03:36 -07:00
Kubernetes Submit Queue
0049dd0717 Merge pull request #48381 from superbrothers/completion-kubectl-config-delete-cluster
Automatic merge from submit-queue

Support completion for kubectl config delete-cluster

**What this PR does / why we need it**:
This PR supports completion for kubectl config delete-cluster.
```
$ kubectl config delete-cluster <tab>
cluster01  minikube
```

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
Support completion for kubectl config delete-cluster
```
2017-07-16 18:50:08 -07:00
Pengfei Ni
79a964ee1d Run hack/update-generated-runtime.sh 2017-07-17 09:49:43 +08:00
Pengfei Ni
31ac1d8e6b Move seccomp from anntations to security context 2017-07-17 09:49:43 +08:00
Kubernetes Submit Queue
8ce6378512 Merge pull request #46091 from xilabao/new-output-in-edit
Automatic merge from submit-queue (batch tested with PRs 46091, 48280)

allow output patch string in edit command

**What this PR does / why we need it**:
allow user to get the patch from edit command if user is not familiar with the patch format.

```
# ./cluster/kubectl.sh create role a --verb=get,list --resource=no
role "a" created

# ./cluster/kubectl.sh edit role a --output-patch=true
Patch: {"rules":[{"apiGroups":[""],"resources":["nodes"],"verbs":["get","list","delete"]}]}
role "a" edited

# ./cluster/kubectl.sh create role b --verb=get,list --resource=no
role "b" created

# ./cluster/kubectl.sh patch role b -p '{"rules":[{"apiGroups":[""],"resources":["nodes"],"verbs":["get","list","delete"]}]}'
role "b" patched
```
**Which issue this PR fixes**: fixes #47173

**Special notes for your reviewer**:

**Release note**:

```release-note
Could get the patch from kubectl edit command
```
2017-07-16 18:04:42 -07:00
Kubernetes Submit Queue
35794a8f2d Merge pull request #47638 from xilabao/update-hostports-log
Automatic merge from submit-queue (batch tested with PRs 47417, 47638, 46930)

update the err of hostPorts in psp

**What this PR does / why we need it**:
change `Allowed ports: [{8000 8080}]` to `Allowed ports: [8000-8080]`

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```
2017-07-16 16:33:03 -07:00
Kubernetes Submit Queue
1cbb7b1405 Merge pull request #47417 from xilabao/print-non-existent-key
Automatic merge from submit-queue (batch tested with PRs 47417, 47638, 46930)

print non-existent key in configmap

**What this PR does / why we need it**:

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #41573

**Special notes for your reviewer**:
carry from #41574
**Release note**:

```release-note
NONE
```
2017-07-16 16:33:01 -07:00
Clayton Coleman
b6d9815b95 Remove use of (Label|Field)SelectorParam 2017-07-16 15:56:11 -04:00
Klaus Ma
01097dba02 Renamed nodeutil to v1node. 2017-07-16 15:11:17 +08:00
Kubernetes Submit Queue
86a42b8796 Merge pull request #46973 from php-coder/improve_flex_logging
Automatic merge from submit-queue (batch tested with PRs 46973, 48556)

Improve error reporting when flex driver has failed to initialize

**What this PR does / why we need it**:

This PR improves error reporting for the case when flex driver is failing to initialize. There are 2 improvements:

1) show only the plugin name instead of a full struct. This makes a message shorter and removes useless and internal information.

Before:
>E0605 16:44:59.330215   26786 plugins.go:359] Failed to load volume plugin &{k8s/nfs /usr/libexec/kubernetes/kubelet-plugins/volume/exec/k8s~nfs %!s(*kubelet.kubeletVolumeHost=&{0xc431ea5800 {{1 0} map[kubernetes.io/downward-api:0xc431ee3f20 kubernetes.io/aws-ebs:0xc431ee3eb0 kubernetes.io/git-repo:0xc431ee3ef0 kubernetes.io/host-path:0xc430e985f0 kubernetes.io/rbd:0xc42bfab840 kubernetes.io/quobyte:0xc431ee3f00 kubernetes.io/fc:0xc42bfab980 kubernetes.io/empty-dir:0xc431ee3ed0 kubernetes.io/nfs:0xc430e98640 kubernetes.io/iscsi:0xc42bfab720 kubernetes.io/glusterfs:0xc430faaba0 kubernetes.io/cinder:0xc42bfab8c0 kubernetes.io/gce-pd:0xc431ee3ee0 kubernetes.io/secret:0xc42bfab6a0 kubernetes.io/flocker:0xc431ee3f30 kubernetes.io/cephfs:0xc431ee3f10]} 0xc42698cf40}) %!s(*exec.executor=&{}) {%!s(int32=0) %!s(uint32=0)} []}, error: unexpected end of JSON input

After:
>E0605 16:59:45.520185   29041 plugins.go:359] Failed to load volume plugin k8s/nfs, error: unexpected end of JSON input

2) quote script output. In case the output was empty, messages look a bit better:

Before:
> E0605 16:44:59.330077   26786 driver-call.go:212] Failed to unmarshal output for command: init, **output: **, error: unexpected end of JSON input
> W0605 16:44:59.330170   26786 driver-call.go:140] FlexVolume: driver call failed: executable: /usr/libexec/kubernetes/kubelet-plugins/volume/exec/k8s\~nfs/nfs, args: [init], error: fork/exec /usr/libexec/kubernetes/kubelet-plugins/volume/exec/k8s\~nfs/nfs: permission denied, **output: **

After:
>E0605 16:59:45.519906   29041 driver-call.go:212] Failed to unmarshal output for command: init, **output: ""**, error: unexpected end of JSON input
>W0605 16:59:45.520109   29041 driver-call.go:140] FlexVolume: driver call failed: executable: /usr/libexec/kubernetes/kubelet-plugins/volume/exec/k8s\~nfs/nfs, args: [init], error: fork/exec /usr/libexec/kubernetes/kubelet-plugins/volume/exec/k8s\~nfs/nfs: permission denied, **output: ""**
2017-07-15 18:02:36 -07:00
Kubernetes Submit Queue
a0519dfa08 Merge pull request #48030 from kargakis/revert-deployment-cleanup
Automatic merge from submit-queue (batch tested with PRs 44129, 48030, 48906)

controller: cleanup complete deployments only

Fixes https://github.com/kubernetes/kubernetes/issues/46932

@kubernetes/sig-apps-pr-reviews
2017-07-15 17:13:39 -07:00
Kubernetes Submit Queue
c3e8bd04a9 Merge pull request #48949 from php-coder/minor_cleanup
Automatic merge from submit-queue

Fix comments and typo in the error message

**What this PR does / why we need it**:
This PR fixes outdated comments and typo in the error message.

**Release note**:
```release-note
NONE
```

CC @simo5
2017-07-15 16:04:21 -07:00
Jordan Liggitt
e8f2879bfd Allow setting service account with kubectl run 2017-07-15 12:37:10 -04:00
Kubernetes Submit Queue
f736f3121f Merge pull request #48326 from karataliu/afd.dev
Automatic merge from submit-queue

Fix share name generation in azure file provisioner.

**What this PR does / why we need it**:
Azure file share name has a length limit of 63, but currently the code is using data volume's limit 75.

**Which issue this PR fixes**
With current implementation, when the cluster name is long, the resulting file share name could have a length of 75.

Also function `GenerateVolumeName` would produce double '-' when clusterName containing '-' is to be truncated.

In both cases, service would reject the creating file share request.

**Special notes for your reviewer**:
Please refer to:
https://docs.microsoft.com/en-us/rest/api/storageservices/naming-and-referencing-shares--directories--files--and-metadata#share-names

- Share names must be from 3 through 63 characters long.
- The name cannot contain two consecutive hyphens.

@rootfs @colemickens 

**Release note**:
2017-07-14 19:50:14 -07:00
Kubernetes Submit Queue
8c8f562204 Merge pull request #48872 from FengyunPan/fix-order
Automatic merge from submit-queue (batch tested with PRs 48890, 46893, 48872, 48896)

Fix the order of deletion

1. EnsureLoadBalancer can't delete pool without deleting members,
   just let EnsureLoadBalancerDeleted do it.
2. Add some friendly error message

**Release note**:
```release-note
NONE
```
2017-07-14 16:49:53 -07:00
Kubernetes Submit Queue
23e60ac9ad Merge pull request #48308 from yguo0905/docker-api
Automatic merge from submit-queue

Update Docker API in Kubelet

Ref: https://github.com/kubernetes/kubernetes/issues/34308

The Kubelet currently uses deprecated docker API (https://godoc.org/github.com/docker/engine-api). This PR changes it to use the new one (https://godoc.org/github.com/moby/moby/client).

This PR updated the docker package from 1.11 to 1.13.1-rc2.

**Release note**:
```
None
```

/assign @Random-Liu 
/cc @yujuhong
2017-07-14 15:30:59 -07:00
Kubernetes Submit Queue
fdb3b2af70 Merge pull request #48578 from fabianofranz/run_output_message_on_container_error
Automatic merge from submit-queue (batch tested with PRs 48578, 48895, 48958)

run must output message on container error

**What this PR does / why we need it**: `kubectl run` must output a message (instead of just exiting with an error code) on container error.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes https://github.com/openshift/origin/issues/15031 found in OpenShift

**Release note**:

```release-note
NONE
```
2017-07-14 13:45:51 -07:00
Kubernetes Submit Queue
2610b9cf52 Merge pull request #48894 from juanvallejo/jvallejo/remove-hardcoded-kubectl-in-apply-warn-msg
Automatic merge from submit-queue (batch tested with PRs 47066, 48892, 48933, 48854, 48894)

replace hardcoded use of "kubectl" in apply warning msg

**Release note**:
```release-note
NONE
```

Removes use of hardcoded "kubectl" in the `kubectl apply ...` warning message that is printed when the `last-applied-configuration` annotation is missing on a resource. This is useful for downstream wrappers around the `apply` command.

cc @stevekuznetsov @fabianofranz
2017-07-14 12:50:57 -07:00
Kubernetes Submit Queue
df47592d5a Merge pull request #48854 from colemickens/msi
Automatic merge from submit-queue (batch tested with PRs 47066, 48892, 48933, 48854, 48894)

azure: msi: add managed identity field, logic

**What this PR does / why we need it**: Enables managed service identity support for the Azure cloudprovider. "Managed Service Identity" allows us to ask the Azure Compute infra to provision an identity for the VM. Users can then retrieve the identity and assign it RBAC permissions to talk to Azure ARM APIs for the purpose of the cloudprovider needs.

Per the commit text:
```
The azure cloudprovider will now use the Managed Service Identity
to retrieve access tokens for the Azure ARM APIs, rather than
requiring hard-coded, user-specified credentials.
```

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: n/a 

**Special notes for your reviewer**: none

**Release note**:

```release-note
azure: support retrieving access tokens via managed identity extension
```

cc: @brendandburns @jdumars @anhowe
2017-07-14 12:50:55 -07:00
Kubernetes Submit Queue
a933551aaa Merge pull request #48892 from ericchiang/client-go-canonical-import
Automatic merge from submit-queue (batch tested with PRs 47066, 48892, 48933, 48854, 48894)

client-go: add canonical import comment

Ensure users check out client-go to the correct location. The install error now reads:

```
can't load package: package github.com/kubernetes/client-go/kubernetes: code in directory /home/eric/src/github.com/kubernetes/client-go/kubernetes expects import "k8s.io/client-go/kubernetes"
```

ref https://github.com/kubernetes/client-go/issues/223

/cc @caesarxuchao @lavalamp 

```release-note
NONE
```
2017-07-14 12:50:49 -07:00
Kubernetes Submit Queue
8532cdfd69 Merge pull request #48886 from mikedanese/cleanup
Automatic merge from submit-queue

remove some people from OWNERS so they don't get reviews anymore

These are googlers who don't work on the project anymore but are still
getting reviews assigned to them:
- @bprashanth
- @rjnagal
- @vmarmol
2017-07-14 11:46:10 -07:00
Kubernetes Submit Queue
3bb2d12e80 Merge pull request #48931 from allencloud/remove-duplicated-word-file-in-error
Automatic merge from submit-queue (batch tested with PRs 48572, 48838, 48931, 48783, 47090)

remove duplicated word file in error

Signed-off-by: allencloud <allen.sun@daocloud.io>



**What this PR does / why we need it**:

remove duplicated word file in error

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
NONE

**Special notes for your reviewer**:
NONE

**Release note**:

```release-note
NONE
```
2017-07-14 10:53:49 -07:00
Kubernetes Submit Queue
fd619b04b2 Merge pull request #48572 from alexandercampbell/kubectl-follow-options-pattern-in-version
Automatic merge from submit-queue

cmd/version: refactor to use the -Options pattern

Refactor `kubectl version` to use the prescribed pattern in [kubectl-conventions.md](49d65710b3/contributors/devel/kubectl-conventions.md (command-implementation-conventions)).

```release-note
NONE
```

/assign @mengqiy
2017-07-14 10:49:11 -07:00
Slava Semushin
ae147a737c Fix comments and typo in the error message. 2017-07-14 19:17:12 +02:00
Kubernetes Submit Queue
9e97b5249b Merge pull request #46360 from khenidak/azure-pd-final
Automatic merge from submit-queue

Azure PD (Managed/Blob)

This is exactly the same code as this [PR](https://github.com/kubernetes/kubernetes/pull/41950). It has a clean set of generated items. We created a separate PR to accelerate the accept/merge the PR

CC @colemickens 
CC @brendandburns 

**What this PR does / why we need it**:

1. Adds K8S support for Azure Managed Disks. 
2. Adds support for dedicated blob disks (1:1 to storage account) in addition to shared blob disks (n:1 to storage account). 
3. Automatically manages the underlying storage accounts. New storage accounts are created at 50% utilization. Max is 100 disks, 60 disks per storage account.    
2. Addresses the current issues with Blob Disks:
..* Significantly faster attach process. Disks are now usually available for pods on nodes under 30 sec if formatted, under a min if not formatted. 
..* Adds support to move disks between nodes.
..* Adds consistent attach/detach behavior, checks if the disk is leased/attached on a different node before attempting to attach to target nodes.
..* Fixes a random hang behavior on Azure VMs during mount/format (for both blob + managed disks).
..* Fixes a potential conflict by avoiding the use of disk names for mount paths. The new plugin uses hashed disk uri for mount path.  

The existing AzureDisk is used as is. Additional "kind" property was added  allowing the user to decide if the pd will be shared, dedicated or managed (Azure Managed Disks are used).

Due to the change in mounting paths, existing PDs need to be recreated as PV or PVCs on the new plugin.
2017-07-14 09:57:51 -07:00
allencloud
389cd57014 remove duplicated word file in error
Signed-off-by: allencloud <allen.sun@daocloud.io>
2017-07-14 18:01:51 +08:00
Kubernetes Submit Queue
751a0b6a4c Merge pull request #48669 from supereagle/revert-pr46246
Automatic merge from submit-queue

Revert workaround in PR 46246 as APIs have been consistent

**What this PR does / why we need it**:
No need to convert v1.ObjectReference as APIs have been consistent in `k8s.io/api/core/v1`.

**Which issue this PR fixes** : fixes #48668

**Special notes for your reviewer**:
/assign @derekwaynecarr @caesarxuchao

**Release note**:
```release-note
NONE
```
2017-07-14 00:32:09 -07:00
Khaled Henidak & Andy Zhang
677e593d86 Add Azure managed disk support 2017-07-14 14:09:44 +08:00
Kubernetes Submit Queue
a014cea392 Merge pull request #48815 from dixudx/mountpath_should_be_absolute
Automatic merge from submit-queue (batch tested with PRs 48082, 48815, 48901, 48824)

mountpath should be absolute

**What this PR does / why we need it**:
Should validate the mountpath before mounting to container. Docker forbids mounting to a relative path inside the container. 

**Which issue this PR fixes** : fixes #48749

**Special notes for your reviewer**:

**Release note**:

```release-note
MountPath should be absolute
```
2017-07-13 22:43:56 -07:00
Kubernetes Submit Queue
d58d29d99d Merge pull request #48082 from ravisantoshgudimetla/kubectl_drain_node_conversion
Automatic merge from submit-queue (batch tested with PRs 48082, 48815, 48901, 48824)

Changes for typecasting node in drain

**What this PR does / why we need it**:

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #48059 

**Special notes for your reviewer**:
Precursor to #44944

**Release note**:

```release-note
kubectl drain now uses PATCH instead of PUT to update the node. The node object is now of type v1 instead of using internal api.
```
2017-07-13 22:43:54 -07:00
Kubernetes Submit Queue
6d69f18f5b Merge pull request #46845 from zhangxiaoyu-zidif/change-fatalf
Automatic merge from submit-queue

Use t.Fatalf instead

**What this PR does / why we need it**:
we can use t.Fatalf to take place of t.Errorf + t.FailNow()


**Release note**:

```release-note
NONE
```
2017-07-13 21:26:07 -07:00
Kubernetes Submit Queue
7deb49ecd8 Merge pull request #48203 from cmluciano/cml/addgpuowners
Automatic merge from submit-queue

Add OWNERS file to kubelet gpu package

GPU support is ramping up and we do not have a lot of reviewers that
are familiar with the codebase. I added myself as a reviewer and
copied a few people from the kubelet OWNERS file as approvers.

Signed-off-by: Christopher M. Luciano <cmluciano@us.ibm.com>

**Release note**:
```
NONE
```
2017-07-13 18:51:04 -07:00
Kubernetes Submit Queue
87cc1ddba5 Merge pull request #48407 from k82cn/testapi_lint
Automatic merge from submit-queue

Updated comments of func in testapi.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #N/A

**Special notes for your reviewer**:

**Release note**:

```release-note-none
```
2017-07-13 18:50:27 -07:00
Chao Xu
503852a1b5 add approvers to pkg/controller/garbagecollector 2017-07-13 15:16:17 -07:00
Cole Mickens
931002ec1f azure: acr docker cred provider reuses auth 2017-07-13 14:27:37 -07:00
Cole Mickens
8f55afd0cb azure: refactor azure.go to make auth reusable 2017-07-13 14:27:37 -07:00
Cole Mickens
4521c2312c azure: msi: add managed identity field, logic
The azure cloudprovider will now use the Managed Service Identity
to retrieve access tokens for the Azure ARM APIs, rather than
requiring hard-coded, user-specified credentials.
2017-07-13 14:27:37 -07:00
Minhan Xia
a471140e13 fix gce cloud provider projects api 2017-07-13 14:00:02 -07:00
juanvallejo
f28ffdb5e9 replace hardcoded use of "kubectl" in apply warning msg 2017-07-13 16:19:19 -04:00
Eric Chiang
90a555545e client-go: add canonical import comment 2017-07-13 13:03:12 -07:00
Yang Guo
bf2ced837c Updates Docker Engine API 2017-07-13 12:55:07 -07:00
Mike Danese
c201553f27 remove some people from OWNERS so they don't get reviews anymore
These are googlers who don't work on the project anymore but are still
getting reviews assigned to them:
- bprashanth
- rjnagal
- vmarmol
2017-07-13 10:02:21 -07:00
gmarek
afe1a2c71b Revert "Merge pull request #48560 from nicksardo/gce-network-project"
This reverts commit d4881dd491, reversing
changes made to b5c4346130.
2017-07-13 18:34:24 +02:00
FengyunPan
a1be23679c Fix the order of deletion
1. EnsureLoadBalancer can't delete pool without deleting members,
   just let EnsureLoadBalancerDeleted do it.
2. Add some friendly error message
2017-07-13 21:10:23 +08:00
Kubernetes Submit Queue
74f1943774 Merge pull request #48849 from nicksardo/gce-panic-fix
Automatic merge from submit-queue (batch tested with PRs 48555, 48849)

GCE: Fix panic when service loadbalancer has static IP address

Fixes #48848 

```release-note
Fix service controller crash loop when Service with GCP LoadBalancer uses static IP (#48848, @nicksardo)
```
2017-07-12 23:59:03 -07:00
Kubernetes Submit Queue
009858f18d Merge pull request #48555 from redbaron/hostPath-and-subPath-symlink
Automatic merge from submit-queue

Fix subPath existence check to not follow symlink

**What this PR does / why we need it**:
Volume mounting logic introduced in #43775 and #45623 checks
for subPath existence before attempting to create a directory,
should subPath not be present.

This breaks if subPath is a dangling symlink, os.Stat returns
"do not exist" status, yet `os.MkdirAll` can't create directory
as symlink is present at the given path.

This patch makes existence check to use os.Lstat which works for
normal files/directories as well as doesn't not attempt to follow
symlink, therefore it's "do not exist" status is more reliable when
making a decision whether to create directory or not.

subPath symlinks can be dangling in situations where kubelet is
running in a container itself with access to docker socket, such
as CoreOS's kubelet-wrapper script

**Release note**:
```release-note
Fix pods failing to start when subPath is a dangling symlink from kubelet point of view, which can happen if it is running inside a container
```
2017-07-12 23:43:12 -07:00