Kubernetes NFS volume with dynamic path - kubernetes

Question

I am trying to mount my applications' logs directory to nfs dynamically including node_name.
No success so far.
I tried as below:
kind: Pod
apiVersion: v1
metadata:
name: nfs-in-a-pod
spec:
containers:
- name: app
image: alpine
env:
- name: POD_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.name
- name: NODE_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: spec.nodeName
volumeMounts:
- name: nfs-volume
mountPath: /var/nfs
subPath: /$(NODE_NAME)
command: ["/bin/sh"]
args: ["-c", "sleep 500000"]
volumes:
- name: nfs-volume
nfs:
server: ip_adress_here
path: /mnt/events

Answer 1

I think instead of subPath you should use subPathExpr, as mentioned in the documentation.
Use the subPathExpr field to construct subPath directory names from Downward API environment variables. This feature requires the VolumeSubpathEnvExpansion feature gate to be enabled. It is enabled by default starting with Kubernetes 1.15. The subPath and subPathExpr properties are mutually exclusive.
In this example, a Pod uses subPathExpr to create a directory pod1 within the hostPath volume /var/log/pods, using the pod name from the Downward API. The host directory /var/log/pods/pod1 is mounted at /logs in the container.
apiVersion: v1
kind: Pod
metadata:
name: pod1
spec:
containers:
- name: container1
env:
- name: POD_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.name
image: busybox
command: [ "sh", "-c", "while [ true ]; do echo 'Hello'; sleep 10; done | tee -a /logs/hello.txt" ]
volumeMounts:
- name: workdir1
mountPath: /logs
subPathExpr: $(POD_NAME)
restartPolicy: Never
volumes:
- name: workdir1
hostPath:
path: /var/log/pods
Hope that´s it.