Logging Chart : configure Fluentd extraVolumes

Rancher
1

Hi, I’m using the rancher-logging Chart via the Rancher Logging plugin. I’d like to create a File Output to store logs into a volume. This might look something like this :

apiVersion: logging.banzaicloud.io/v1beta1
kind: Output
metadata:
  name: logs-file.output
  namespace: my-namespace
spec:
  file:
    buffer:
      chunk_limit_size: 16MB
      flush_at_shutdown: true
      flush_interval: 5s
      flush_mode: interval
      flush_thread_count: 8
      overflow_action: drop_oldest_chunk
      retry_max_interval: 30s
      retry_timeout: 1h
      retry_type: exponential_backoff
    path: /var/nfs/logs

But I don’t know how to mount a PersistentVolumeClaim on Fluentd. I’m pretty sure I can specify the extraVolumes property on the Logging resource :

apiVersion: logging.banzaicloud.io/v1beta1
kind: Logging
metadata:
  name: rancher-logging-root
spec:
  controlNamespace: cattle-logging-system
  fluentbit:
    ...
  fluentd:
    ...
    extraVolumes:
      - containerName: fluentd
        path: /var/nfs/logs
        volume:
          pvc:
            source:
              claimName: logs-storage-nfs
    ...

But since it’s managed by HELM, I shouldn’t modify it manually, but I don’t know how to configure this via the chart values.