Configuration Datastore not persisting in Kubernetes - Devices lost on lighty-rnc-app after the pod restart

[techprakashverma]

I have deployed lighty-rnc-app-aggregator → lighty-rnc-app using the lighty-rnc-app-helm chart in Kubernetes, and I'm trying to understand where device (node) configuration data is physically stored.

My Setup:
Application: lighty-rnc-app (from lighty-rnc-app-aggregator)
Deployment: Kubernetes using lighty-rnc-app-helm chart

What I Did:
I successfully added a NETCONF device using the RESTCONF API:

curl --request PUT \
  --url http://127.0.0.1:8888/restconf/data/network-topology:network-topology/topology=topology-netconf/node=node-1 \
  --header 'content-type: application/json' \
  --data '{
    "node": [{
      "node-id": "node-1",
      "netconf-node-topology:netconf-node": {
        "schemaless": false,
        "tcp-only": false,
        "port": 17830,
        "login-password-unencrypted": {
          "username": "admin",
          "password": "admin"
        },
        "keepalive-delay": 0,
        "host": "172.17.0.2"
      }
    }]
  }'

The device was successfully created, and I can retrieve it via GET request.

The problem:

When I restart the pod (kubectl delete pod ), the device configuration is lost.

After the pod restarts:

curl --request GET \
  --url http://localhost:8888/restconf/data/network-topology:network-topology/topology=topology-netconf/node=node-1

Returns:

{
  "errors": {
    "error": [
      {
        "error-tag": "data-missing",
        "error-message": "Request could not be completed because the relevant data model content does not exist",
        "error-type": "protocol"
      }
    ]
  }
}

My Questions:

1. Where is this device data physically stored?

   • Is it stored in the Configuration Datastore (persistent) or Operational Datastore (in-memory)?
   • What is the file system path inside the Kubernetes pod where this data is persisted?

2. Storage mechanism in Kubernetes:

   • I've accessed the pod using kubectl exec -it -- /bin/sh
   • I checked the /data/, /opt/, /snapshots/, and other common directories, but I could not find any datastore filesystem where the data is stored.