Access remote disk

Access disk remotely using nbd

$ kubectl get pvc
NAME       STATUS   VOLUME              CAPACITY   ACCESS MODES   STORAGECLASS   AGE
pvc-test   Bound    local-pv-25a396e8   34Gi       RWO            local          52m
$ kubectl apply -f expose-pvc-nbd.yaml
service/virt configured
pod/virt configured
# In another console
$ kubectl port-forward pod/virt 8080:8080
Handling connection for 8080

# Access locally the disk with guestfs
$ guestfish --format=raw  -a nbd://0.0.0.0:8080 

Welcome to guestfish, the guest filesystem shell for
editing virtual machine filesystems and disk images.

Type: ‘help’ for help on commands
      ‘man’ to read the manual
      ‘quit’ to quit the shell

><fs> run
><fs> list-filesystems 
/dev/sda: ext4
><fs> 
><fs> touch /test
><fs> ls /
lost+found
test
><fs> exit

# Or you can run other libguestfs tools
$ virt-rescue --format=raw  -a nbd://0.0.0.0:8080
Welcome to virt-rescue, the libguestfs rescue shell.

Note: The contents of / (root) are the rescue appliance.
You have to mount the guest’s partitions under /sysroot
before you can examine them.

><rescue> lsblk       
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda    8:0    0   1G  0 disk 
sdb    8:16   0   4G  0 disk /
><rescue> mount /dev/sda /sysroot/
><rescue> ls /sysroot/
lost+found  test

expose-pvc-nbd.yaml

apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  name: virt
spec:
  ports:
  - port: 8080
    protocol: TCP
    targetPort: 8080
  selector:
    run: virt
status:
  loadBalancer: {}
---
---
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: virt
  name: virt
spec:
  containers:
  - args:
    - "qemu-nbd"
    - "-f"
    - "raw"
    - "-t"
    - "-p"
    - "8080"
    - "/disks/disk.img"
    image: afrosirh/debug-virt
    name: virt
    ports:
    - containerPort: 8080
    resources: {}
    volumeMounts:
    - mountPath: "/disks"
      name: pvc
  volumes:
  - name: pvc
    persistentVolumeClaim:
      claimName: pvc-test