Kubernetes PetSet - FailedCreate of persistent volume - docker

Question

I'm trying to setup a Kubernetes PetSet as described in the documentation. When I create the PetSet I can't seem to get the Persistent Volume Claim to bind to the persistent volume. Here is my Yaml File for defining the PetSet:
apiVersion: apps/v1alpha1
kind: PetSet
metadata:
name: 'ml-nodes'
spec:
serviceName: "ml-service"
replicas: 1
template:
metadata:
labels:
app: marklogic
tier: backend
annotations:
pod.alpha.kubernetes.io/initialized: "true"
spec:
containers:
- name: 'ml'
image: "192.168.201.7:5000/dcgs-sof/ml8-docker-final:v1"
imagePullPolicy: Always
ports:
- containerPort: 8000
name: ml8000
protocol: TCP
- containerPort: 8001
name: ml8001
- containerPort: 7997
name: ml7997
- containerPort: 8002
name: ml8002
- containerPort: 8040
name: ml8040
- containerPort: 8041
name: ml8041
- containerPort: 8042
name: ml8042
volumeMounts:
- name: ml-data
mountPath: /data/vol-data
lifecycle:
preStop:
exec:
# SIGTERM triggers a quick exit; gracefully terminate instead
command: ["/etc/init.d/MarkLogic stop"]
volumes:
- name: ml-data
persistentVolumeClaim:
claimName: ml-data
terminationGracePeriodSeconds: 30
volumeClaimTemplates:
- metadata:
name: ml-data
annotations:
volume.alpha.kubernetes.io/storage-class: anything
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 2Gi
If I do a 'describe' on my created PetSet I see the following:
Name: ml-nodes
Namespace: default
Image(s): 192.168.201.7:5000/dcgs-sof/ml8-docker-final:v1
Selector: app=marklogic,tier=backend
Labels: app=marklogic,tier=backend
Replicas: 1 current / 1 desired
Annotations: <none>
CreationTimestamp: Tue, 20 Sep 2016 13:23:14 -0400
Pods Status: 0 Running / 1 Waiting / 0 Succeeded / 0 Failed
No volumes.
Events:
FirstSeen LastSeen Count From SubobjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
33m 33m 1 {petset } Warning FailedCreate pvc: ml-data-ml-nodes-0, error: persistentvolumeclaims "ml-data-ml-nodes-0" not found
33m 33m 1 {petset } Normal SuccessfulCreate pet: ml-nodes-0
I'm trying to run this in a minikube environment on my local machine. Not sure what I'm missing here???

Answer 1

There is an open issue on minikube for this. Persistent volume provisioning support appears to be unfinished in minikube at this time.
For it to work with local storage, it needs the following flag on the controller manager and that isn't currently enabled on minikube.
--enable-hostpath-provisioner[=false]: Enable HostPath PV
provisioning when running without a cloud provider. This allows
testing and development of provisioning features. HostPath
provisioning is not supported in any way, won't work in a multi-node
cluster, and should not be used for anything other than testing or
development.
Reference: http://kubernetes.io/docs/admin/kube-controller-manager/
For local development/testing, it would work if you were to use hack/local_up_cluster.sh to start a local cluster, after setting an environment variable:
export ENABLE_HOSTPATH_PROVISIONER=true

Answer 2

You should be able to use PetSets in the latest version of minikube as it uses kubernetes v1.4.1 as the default version.