vmkfstools -c 2G /vmfs/volumes/DatastoreName/volumes/myDisk.vmdk
OpenShift Origin supports VMWare vSphere’s VMDK (Virtual Machine Disk) Volumes. You can provision your OpenShift Origin cluster with persistent storage using VMWare vSphere. Some familiarity with Kubernetes and VMWare vSphere is assumed.
The OpenShift Origin persistent volume framework allows administrators to provision a cluster with persistent storage and gives users a way to request those resources without having any knowledge of the underlying infrastructure. VMWare vSphere VMDK Volumes can be provisioned dynamically.
Persistent volumes are not bound to a single project or namespace; they can be shared across the OpenShift Origin cluster. Persistent volume claims, however, are specific to a project or namespace and can be requested by users.
High-availability of storage in the infrastructure is left to the underlying storage provider.
Before creating persistent volumes using VMWare vSphere, ensure your OpenShift Origin cluster meets the following requirements:
OpenShift Origin must first be configured for VMWare vSphere.
Each node host in the infrastructure must match the vSphere virtual machine name.
Each node host must be in the same resource group.
Create VMDK using one of the following methods before using them.
Storage must exist in the underlying infrastructure before it can be mounted as
a volume in OpenShift Origin. After ensuring OpenShift Origin is
for VMWare vSpehere, all that is required for OpenShift Origin and vSphere is a VM folder path, file system type, and the
You must define your persistent volume in an object definition before creating it in OpenShift Origin:
apiVersion: v1 kind: PersistentVolume metadata: name: pv0001 (1) spec: capacity: storage: 2Gi (2) accessModes: - ReadWriteOnce persistentVolumeReclaimPolicy: Retain vsphereVolume: (3) volumePath: "[datastore1] volumes/myDisk" (4) fsType: ext4 (5)
|1||The name of the volume. This must be how it is identified via persistent volume claims or from pods.|
|2||The amount of storage allocated to this volume.|
|3||This defines the volume type being used (vsphereVolume plug-in, in this example). The
|4||This VMDK volume must exist.|
|5||File system type to mount (for example,
Changing the value of the
Save your definition to a file, for example vsphere-pv.yaml, and create the persistent volume:
$ oc create -f vsphere-pv.yaml persistentvolume "pv0001" created
Verify that the persistent volume was created:
$ oc get pv NAME LABELS CAPACITY ACCESSMODES STATUS CLAIM REASON AGE pv0001 <none> 2Gi RWO Available 2s
Now you can request storage using persistent volume claims, which can now use your new persistent volume.
Persistent volume claims only exist in the user’s namespace and can only be referenced by a pod within that same namespace. Any attempt to access a persistent volume from a different namespace causes the pod to fail.
Before OpenShift Origin mounts the volume and passes it to a container, it checks
that the volume contains a file system as specified by the
fsType parameter in
the persistent volume definition. If the device is not formatted with the file
system, all data from the device is erased and the device is automatically
formatted with the given file system.
This allows unformatted VMWare vSphere volumes to be used as persistent volumes, because OpenShift Origin formats them before the first use.