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mount.crypt - mount a dm-crypt encrypted volume
mount.crypt [-nrv] [-o options] device
- -o options
- Set further mount options. mount.crypt will take out its own options it
recognizes and passes any remaining options on to the underlying mount
program. See below for possible options.
- Do not update /etc/mtab. Note that this makes it impossible to unmount the
volume by naming the container - you will have to pass the mountpoint to
- Set up the loop device (if necessary) and crypto device in read-only mode.
(The mount itself will necessarily also be read-only.) Note that doing a
remount using `mount /mnt -o remount,rw` will not make the mount
readwrite. The crypto and loop devices will have to be disassociated
- Turn on debugging and be a bit more verbose.
- Enables discard passthrough support. This option does not cause the
filesystem to be mounted with discard enabled, but does allow fstrim to be
- The cryptsetup cipher used for the encrypted volume. This option is
mandatory for PLAIN (non-LUKS) volumes. pmt-ehd(8) defaults to creating
volumes with "aes-cbc-essiv:sha256" as a cipher.
- Select the name for the crypto device (optional). This option is currently
only usable with dm-crypt systems.
- Run fsck on the container before mounting it.
- The OpenSSL cipher used for the filesystem key. The special keyword
"none" can be used to bypass decryption and pass the file
contents directly to libcryptsetup.
- The OpenSSL hash used for producing key and IV.
- The exact type of filesystem in the encrypted container. The default is to
let the kernel autodetect.
- The cryptsetup hash used for the encrypted volume. This defaults to no
hashing, because pam_mount assumes EHD volumes with strong and simple
- The path to the key file. This option is mandatory for "normal"
crypto volumes and should not be used for LUKS volumes.
- Causes the filesystem to be remounted with new options. Note that
mount.crypt cannot switch the underlying loop device (if applies) or the
crypto device between read-only and read-write once it is created; only
the actual filesystem mount can be changed, with limits. If the loop
device is read-only, the crypto device will be read-only, and changing the
mount to read-write is impossible. Similarly, going from rw to ro will
only mark the mount read-only, but not the crypto or loop device, thus
making it impossible to set the filesystem the crypto container is located
on to read-only.
- Same as the -r option.
- Same as the -v option.
Obsolete mount options¶
This section is provided for reference.
- This option used to set up a loop device, because cryptsetup(8) expects a
block device. The option is ignored because mount.crypt can figure this
out on its own.