Pod unable to mount same path in two volumes - kubernetes

Question

I am a newbie here , but I have a use case where I need to mount same path to two different PV's , When ever I try to give the same path my pod doesn't come up check mount paths below
- name : xxx
mountPath : "/home/{username}"
readOnly : false
static:
pvcName:
subPath: '{username}'
capacity: 10Gi
homeMountPath: '/home/{username}'
dynamic:
storageClass: nfs-client
pvcNameTemplate: claim-{username}{servername}
volumeNameTemplate: volume-{username}{servername}
storageAccessModes: [ReadWriteOnce]
But after changing the mount path pod comes up without any issue example
mountPath : "/home/test/{username}"
Is there something I am missing

Answer 1

If you want to mount the Single POD with multiple PVC it wont possible unless you use the ReadWiteMany.
But if you want to mount multiple path to POD it's possible using single PVC or multiple PVC depends on use case.
Single PVC single POD
apiVersion: v1
kind: Pod
metadata:
name: my-test-pod
spec:
containers:
- name: mysql
image: mysql
env:
- name: MYSQL_HOST
value: "IP"
volumeMounts:
- mountPath: /var/lib/mysql
name: data
subPath: path1
- name: nginx
image: nginx
volumeMounts:
- mountPath: /var/www/html
name: data
subPath: path2
volumes:
- name: data
persistentVolumeClaim:
claimName: my-site-data
Multiple PVC and volume path to single POD
apiVersion: v1
kind: Pod
metadata:
name: test-pod
spec:
volumes:
# List of volumes
- name: volume1
< volume details, see below >
- name: volume2
< volume details, see below >
containers:
- name: mycontainer
volumeMounts:
# Path
# will mount 'volume1' into /var/www/html
- name: volume1
mountPath: /var/www/html
# will mount 'volume2' into /var/log
- name: volume2
mountPath: /var/log/
Reference : https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html/getting_started_with_kubernetes/get_started_provisioning_storage_in_kubernetes#example