sourceMountPath or subPath(Expr) for volumes #7
Description
Hi,
I have an issue to integrate moosefs-csi in StatefulSet. I need a way to determine the source path to mount. I already know I can make a subPath under volumeMounts such as:
kind: Pod
apiVersion: v1
metadata:
name: my-csi-app
spec:
containers:
- name: my-frontend
image: busybox
volumeMounts:
- mountPath: "/data"
name: moosefs-volume
subPath: subdir # <--------- here
command: [ "sleep", "1000000" ]
volumes:
- name: moosefs-volume
persistentVolumeClaim:
claimName: moosefs-csi-pvc
but I need to do this under Volume:
kind: Pod
apiVersion: v1
metadata:
name: my-csi-app
spec:
containers:
- name: my-frontend
image: busybox
volumeMounts:
- mountPath: "/data"
name: moosefs-volume
command: [ "sleep", "1000000" ]
volumes:
- name: moosefs-volume
persistentVolumeClaim:
claimName: moosefs-csi-pvc
subPath: subdir # <--------- here
Even if it looks the same, it is fundamentally different. I need to be able to choose which directory in the source I want to mount, with the ability to add a POD_NAME in case of StatefulSet.
My use case is OpenLdap, that has a data persistence in /var/lib/openldap. I cannot mount /var/lib/openldap/$(POD_NAME) or I would need to modify the OpenLdap configuration to refer to a dynamic path.
Eg of what I want for my usecase:
kind: Pod
apiVersion: v1
metadata:
name: my-csi-app
spec:
containers:
- name: my-frontend
image: busybox
volumeMounts:
- mountPath: "/data"
name: moosefs-volume
command: [ "sleep", "1000000" ]
env:
- name: POD_NAME # <--------- here
valueFrom:
fieldRef:
fieldPath: metadata.name
volumes:
- name: moosefs-volume
persistentVolumeClaim:
claimName: moosefs-csi-pvc
subPathExpr: $(POD_NAME) # <--------- here