vmkfstools -c 2G /vmfs/volumes/DatastoreName/volumes/myDisk.vmdk
OKD supports VMware vSphere’s Virtual Machine Disk (VMDK) volumes. You can provision your OKD cluster with persistent storage using VMware vSphere. Some familiarity with Kubernetes and VMware vSphere is assumed.
The OKD persistent volume (PV) 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. vSphere VMDK volumes can be provisioned dynamically.
PVs are not bound to a single project or namespace; they can be shared across the OKD cluster. PV 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 PVs using vSphere, ensure your OKD cluster meets the following requirements:
OKD must first be configured for vSphere.
Each node host in the infrastructure must match the vSphere VM 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 OKD. After ensuring OKD is
for vSphere, all that is required for OKD and vSphere is a VM folder path, file system type, and the
You must define your PV in an object definition before creating it in OKD:
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 by PV 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, and you must include brackets () in the volume definition.|
|5||The file system type to mount (for example,
Changing the value of the
To create persistent volumes:
Save your definition to a file, for example vsphere-pv.yaml, and create the PV:
$ oc create -f vsphere-pv.yaml persistentvolume "pv0001" created
Verify that the PV 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 PV claims, which can now use your PV.
PV 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 PV from a different namespace causes the pod to fail.
Before OKD 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 PV 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 vSphere volumes to be used as PVs, because OKD formats them before the first use.