K
Q

How to create "PersistentVolumeClaim" in Kubernetes on "Docker for windows"

9/12/2018

In the "Juju" installation of kubernetes in Vsphere, we create pvc as follows,

---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: db-data
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: fast
  resources:
    requests:
      storage: 1Gi

with the storageClassName as "fast". What it the storage class we need to create a "PersistentVolumeClaim" in "Docker for windows" installation.

-- JMadushan
docker
docker-for-windows
kubernetes

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2 Answers

9/13/2018

A StorageClass provides a way for administrators to describe the “classes” of storage they offer. Different classes might map to quality-of-service levels, or to backup policies, or to arbitrary policies determined by the cluster administrators. Kubernetes itself is unopinionated about what classes represent. This concept is sometimes called “profiles” in other storage systems.

You can create several StorageClasses that fit your needs referring to vSphere examples in the official documentation:

vSphere

Create a StorageClass with a user specified disk format.

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: fast
provisioner: kubernetes.io/vsphere-volume
parameters:
  diskformat: zeroedthick

diskformat: thin, zeroedthick and eagerzeroedthick. Default: "thin".

Create a StorageClass with a disk format on a user specified datastore.

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: fast
provisioner: kubernetes.io/vsphere-volume
parameters:
    diskformat: zeroedthick
    datastore: VSANDatastore

datastore: The user can also specify the datastore in the StorageClass. The volume will be created on the datastore specified in the storage class, which in this case is VSANDatastore. This field is optional. If the datastore is not specified, then the volume will be created on the datastore specified in the vSphere config file used to initialize the vSphere Cloud Provider.

Storage Policy Management inside kubernetes

Using existing vCenter SPBM policy

One of the most important features of vSphere for Storage Management is policy based Management. Storage Policy Based Management (SPBM) is a storage policy framework that provides a single unified control plane across a broad range of data services and storage solutions. SPBM enables vSphere administrators to overcome upfront storage provisioning challenges, such as capacity planning, differentiated service levels and managing capacity headroom.

The SPBM policies can be specified in the StorageClass using the storagePolicyName parameter.

Virtual SAN policy support inside Kubernetes

Vsphere Infrastructure (VI) Admins will have the ability to specify custom Virtual SAN Storage Capabilities during dynamic volume provisioning. You can now define storage requirements, such as performance and availability, in the form of storage capabilities during dynamic volume provisioning. The storage capability requirements are converted into a Virtual SAN policy which are then pushed down to the Virtual SAN layer when a persistent volume (virtual disk) is being created. The virtual disk is distributed across the Virtual SAN datastore to meet the requirements.

You can see Storage Policy Based Management for dynamic provisioning of volumes for more details on how to use storage policies for persistent volumes management.

There are few vSphere examples which you try out for persistent volume management inside Kubernetes for vSphere.

-- VAS
Source: StackOverflow
9/12/2018

Hope I found the answer,

kubectl get storageclass gives output as follows,

NAME                 PROVISIONER          AGE
hostpath (default)   docker.io/hostpath   22h

then, we can use 'hostpath' as the value for 'storageClassName'

-- JMadushan
Source: StackOverflow