Cryptsetup Operations: Difference between revisions
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yum install cryptsetup | yum install cryptsetup | ||
=Encrypting a Block Device with cryptsetup/LUKS= | =Creating an Encrypting a Block Device with cryptsetup/LUKS= | ||
Format the block device with [[Dm-crypt#LUKS|LUKS]] and assign it a [[Dm-crypt#Passphrase|passphrase]] (it is also possible to use a [[Dm-crypt#Key_File|key file]]). The command will ask for a passphrase at the console: | Format the block device with [[Dm-crypt#LUKS|LUKS]] and assign it a [[Dm-crypt#Passphrase|passphrase]] (it is also possible to use a [[Dm-crypt#Key_File|key file]]). The command will ask for a passphrase at the console: | ||
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mount /dev/mapper/rackstationb /rackstationb | mount /dev/mapper/rackstationb /rackstationb | ||
=Mounting a LUKS Device at Boot= | |||
Revision as of 09:03, 24 December 2018
Internal
Overview
cryptsetup is the userspace utility used to manage the dm-crypt encryption functionality.
Installation
yum install cryptsetup
Creating an Encrypting a Block Device with cryptsetup/LUKS
Format the block device with LUKS and assign it a passphrase (it is also possible to use a key file). The command will ask for a passphrase at the console:
cryptsetup luksFormat -y -v /dev/sdb
Test password: b4H4x9_3hdHEd
After 'luksFormat' operation, the block device is now type "", as blkid shows:
# blkid ... /dev/sdb: UUID="8a5fa3ae-d997-4c3a-a6f6-ab7ac9007ef8" TYPE="crypto_LUKS"
Open the crypto_LUKS device with:
cryptsetup open <luks-device> <mapping-name>
where <mapping-name> is the name of the device that will be created under /dev/mapper:
cryptsetup open /dev/sdb rackstationb
Upon providing the correct passphrase, the encrypted device will be mounted as /dev/mapper/rackstationb:
cd /dev/mapper/ ls -al rackstationb lrwxrwxrwx. 1 root root 7 Dec 24 00:36 rackstationb -> ../dm-2
Once the encrypted device is available under /dev/mapper, a filesystem can be built on it:
mkfs.xfs /dev/mapper/rackstationb
The filesystem can then be mounted and used:
mount /dev/mapper/rackstationb /rackstationb