configure vnode disks
vnconfig command configures vnode pseudo disk
devices. It will associate (or disassociate) the special file
vnd_dev with the regular file
image, allowing the latter to be accessed as though it
were a disk. If vnd_dev is not specified, an unused one
will be allocated and the name printed to stdout.
The options are as follows:
Configure a CD-ROM or DVD image file as vnode disk vnd0 and mount the ISO 9660
file system contained in it:
- Associate an encryption key with the device. All data will be encrypted
using the Blowfish cipher before it is written to the disk. The user is
asked for both a passphrase and the name of a salt file. The salt file can
also be specified on the command line using the
option. The passphrase and salt are combined according to PKCS #5 PBKDF2
for the specified number of rounds to generate the actual key used.
rounds is a number between 1000 and
INT_MAX. DO NOT LOSE THE SALT FILE.
- Associate an encryption key with the device. The user is asked for the
encryption key. All data will be encrypted using the Blowfish cipher
before it is written to the disk.
- List the vnd devices and indicate which ones are in use. If a specific
vnd_dev is given, then only that one will be
-K is used, specify the
- Specify a disktype entry from the
disktab(5) database. The
vnd_dev will have the sector size, sectors per
track, and tracks per cylinder values of the specified
disktype. The defaults are 512-byte sectors, 100
sectors per track and 1 track per cylinder.
- Unconfigure a vnd_dev.
- Print messages to stdout describing actions taken.
# vnconfig vnd0 /tmp/diskimage
# mount -t cd9660 /dev/vnd0c /mnt
Configure an encrypted image file as vnode disk vnd0 and mount the
FFS file system contained in the ‘a’ partition of the
disklabel. Same as above, but now configure the vnode using PKCS #5 PBKDF2
and a salt file with 20000 rounds:
# vnconfig -K 20000 vnd0 /tmp/cryptimg
Salt file: /tmp/cryptsalt
# mount /dev/vnd0a /mnt
vnconfig command first appeared in