Result: Now you should have a block device created on /dev/longhorn/<volume_name> for this device, such as /dev/longhorn/pvc-06b4a8a8-b51d-42c6-a8cc-d8c8d6bc65bc for the example above. Now you can mount the block device to get the access to the data.
To avoid accidental change of the volume content, it’s recommended to use mount -o ro to mount the directory as readonly.
After you are done accessing the volume content, use docker stop to stop the container. The block device should disappear from the /dev/longhorn/ directory after the container is stopped.