Is it correct to assume that one PV can be consumed by several PVCs and each pod instance needs one binding of PVC? I'm asking because I created a PV and then a PVC with different size requirements such as:
kind: PersistentVolume
apiVersion: v1
metadata:
name: k8sdisk
labels:
type: amazonEBS
spec:
capacity:
storage: 200Gi
accessModes:
- ReadWriteOnce
awsElasticBlockStore:
volumeID: vol-xxxxxx
fsType: ext4
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: couchbase-pvc
labels:
type: amazonEBS
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 5GiBut when I use the PVC with the pod, it shows as 200GB available instead of the 5GB.
I'm sure I'm mixing things, but could not find a reasonable explanation.
When you have a PVC it will look for a PV that will satisfy it's requirements, but unless it is a volume and claim in multi-access mode (and there is a limited amount of backends that support it, like ie. NFS - details in http://kubernetes.io/docs/user-guide/persistent-volumes/#access-modes), the PV will not be shared by multiple PVC. Furthermore, the size in PVC is not intended as quota for the amount of data saved on the volume during pods life, but as a way to match big enough PV, and thats it.