How can I mount folder correctly in kubernetes - kubernetes

Question

I'm trying to run nodered in my minikube kubernetes cluster ("cluster", its one node :D).
The docker command to do this is by example:
docker run -it -p 1880:1880 -v /home/user/node_red_data:/data --name mynodered nodered/node-red
But I'm not running it in docker, I'm trying to run it in minikube. The documentation of minikube states that /data on the host is persisted. So what I wanted was a /data/nodered to be mounted up as /data on the nodered container.
I started with adding a storage class:
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: Immediate
Then added persistent storage:
apiVersion: v1
kind: PersistentVolume
metadata:
name: small-pv
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
storageClassName: local-storage
local:
path: /data
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- minikube
Then a persistent volume claim for the nodered:
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nodered-claim
spec:
storageClassName: local-storage
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
And then the deployment:
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: nodered
name: nodered
spec:
replicas: 1
volumes:
- name: nodered-claim
persistentVolumeClaim:
claimName: nodered-claim
selector:
matchLabels:
app: nodered
template:
metadata:
labels:
app: nodered
spec:
containers:
- name: nodered
image: nodered/node-red:latest
ports:
- containerPort: 1880
volumeMounts:
- name: nodered-claim
mountPath: "/data"
subPath: "nodered"
I've checked kubernetes dasboard and everything is green and volume is bound. I created a simple http service in nodered and deployed it. It's running but nothing is saved. So if the deployment goes down and gets redeployed it will be empty.
I've checked the /data and /data/nodered folders on the minikube instance running in docker but they are empty.

Answer 1

Your deployment spec should return error, try the following:
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: nodered
name: nodered
spec:
replicas: 1
selector:
matchLabels:
app: nodered
template:
metadata:
labels:
app: nodered
spec:
containers:
- name: nodered
image: nodered/node-red:latest
ports:
- containerPort: 1880
volumeMounts:
- name: nodered-claim
mountPath: /data/nodered
# subPath: nodered <-- not needed in your case
volumes:
- name: nodered-claim
persistentVolumeClaim:
claimName: nodered-claim