Access a Kubernetes node root filesystem from a pod

root-host-volume-shell.yaml

# Access a Kubernetes node root filesystem under /mnt/root
# Replace nodename.k8s.example.org with the Kubernetes node you want to access
#
#   kubectl apply -f root-host-volume-shell.yaml 
#   kubectl exec -it root-host-volume-shell -- bash
---
apiVersion: v1
kind: Pod
metadata:
  name: root-host-volume-shell
spec:
  nodeSelector:
    kubernetes.io/hostname: nodename.k8s.example.org
  containers:
  - name: root-host-volume-shell
    command:
    - sleep
    args:
    - 1h
    image: docker.io/library/busybox:latest
    imagePullPolicy: IfNotPresent
    securityContext:
      privileged: true
    volumeMounts:
    - mountPath: /mnt/root
      name: host-root
  restartPolicy: Never
  tolerations:
  - effect: NoSchedule
    key: hub.jupyter.org/dedicated
    operator: Equal
    value: user
  - effect: NoSchedule
    key: hub.jupyter.org_dedicated
    operator: Equal
    value: user
  volumes:
  - hostPath:
      path: /
      type: Directory
    name: host-root