<p>Trying to deploy a stateful jupyter notebook in Kubernetes, but not able to save the code written in a notebook, whenever the notebook pod is going down all the code is being deleted. I tried to use persistent volume but unable to achieve the expected result.</p>

<p>UPDATE</p>

<p>Changed mount path to "/home/jovyan" as jyputer saves the ipynb in this location. But now getting PermissionError: [Errno 13] Permission denied: '/home/jovyan/.local' while deploying the pod.</p>

<pre><code>kind: Ingress
metadata:
  name: jupyter-ingress
spec:
  backend:
    serviceName: jupyter-notebook-service
    servicePort: 8888

---

kind: Service
apiVersion: v1
metadata:
  name: jupyter-notebook-service
spec:  
  clusterIP: None
  selector:
    app: jupyter-notebook
  ports:
  - protocol: TCP    
    port: 8888
    targetPort: 8888

---

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: jupyter-notebook
  labels:
    app: jupyter-notebook
spec:
  replicas: 1
  serviceName: "jupyter-notebook-service"
  selector:
    matchLabels:
      app: jupyter-notebook
  template:
    metadata:
      labels:
        app: jupyter-notebook
    spec:
      serviceAccountName: dsx-spark
      volumes:
        - name: jupyter-pv-storage
          persistentVolumeClaim:
            claimName: jupyter-pv-claim 
      containers:
      - name: minimal-notebook
        image: jupyter/pyspark-notebook:latest
        ports:
        - containerPort: 8888
        command: ["start-notebook.sh"]
        args: ["--NotebookApp.token=''"]
        volumeMounts:
          - mountPath: "/home/jovyan"
            name: jupyter-pv-storage

---

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: jupyter-pv-claim
spec:
  storageClassName: jupyter-pv-storage
  accessModes:
  - ReadWriteOnce 
  resources:
    requests:
      storage: 1Gi

---
---

apiVersion: v1
kind: PersistentVolume
metadata:
  name: jupyter-pv-volume
  labels:
    type: local
spec:
  storageClassName: jupyter-pv-storage
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce 
  hostPath:
    path: "/home/jovyan"

---

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: jupyternotebook-pv-storage
  annotations:
    storageclass.kubernetes.io/is-default-class: "true"
  labels:
provisioner: kubernetes.io/vsphere-volume
parameters:
    diskformat: zeroedthick
    ```
</code></pre>

<p>The Pod with jupyter notebook is non-root user so unable to mount the so we are
using initContainers to change user/permission of the Persistent Volume Claim before creating the Pod.</p>

<pre><code>kind: StatefulSet
metadata:
  name: jupyter-notebook
  labels:
    app: jupyter-notebook
spec:
  replicas: 1
  serviceName: "jupyter-notebook-service"
  selector:
    matchLabels:
      app: jupyter-notebook
  template:
    metadata:
      labels:
        app: jupyter-notebook
    spec:

      serviceAccountName: dsx-spark
      volumes:
        - name: ci-jupyter-storage-def
          persistentVolumeClaim:
            claimName: my-jupyter-pv-claim 
      containers:
      - name: minimal-notebook
        image: jupyter/pyspark-notebook:latest
        ports:
        - containerPort: 8888
        command: ["start-notebook.sh"]
        args: ["--NotebookApp.token=''"]
        volumeMounts:
          - mountPath: "/home/jovyan/work"
            name: ci-jupyter-storage-def

      initContainers:
      - name: jupyter-data-permission-fix
        image: busybox
        command: ["/bin/chmod","-R","777", "/data"]
        volumeMounts:
        - name: ci-jupyter-storage-def
          mountPath: /data```
</code></pre>
