cryptsetup-luksSuspend - suspends an active device and wipes the key

cryptsetup luksSuspend [<options>] <name>

Suspends an active device (all IO operations will block and accesses to the device will wait indefinitely) and wipes the encryption key from kernel memory. Needs kernel 2.6.19 or later.

While the luksSuspend operation wipes encryption keys from memory, it does not remove possible plaintext data in various caches or in-kernel metadata for mounted filesystems.

After this operation, you have to use luksResume to reinstate the encryption key and unblock the device or close to remove the mapped device.

<options> can be [--header, --disable-locks].

WARNING: Never suspend the device on which the cryptsetup binary resides.

--batch-mode, -q

Suppresses all confirmation questions. Use with care!

If the --verify-passphrase option is not specified, this option also switches off the passphrase verification.

--debug or --debug-json

Run in debug mode with full diagnostic logs. Debug output lines are always prefixed by #.

If --debug-json is used, additional LUKS2 JSON data structures are printed.


Disable lock protection for metadata on disk. This option is valid only for LUKS2 and ignored for other formats.

WARNING: Do not use this option unless you run cryptsetup in a restricted environment where locking is impossible to perform (where /run directory cannot be used).

--header <device or file storing the LUKS header>

Use a detached (separated) metadata device or file where the LUKS header is stored. This option allows one to store ciphertext and LUKS header on different devices.

For commands that change the LUKS header (e.g. luksAddKey), specify the device or file with the LUKS header directly as the LUKS device.

--help, -?

Show help text and default parameters.


Show short option help.

--version, -V

Show the program version.

Report bugs at cryptsetup mailing list <> or in Issues project section

Please attach output of the failed command with --debug option added.

Cryptsetup FAQ

cryptsetup(8), integritysetup(8) and veritysetup(8)

Part of cryptsetup project

2024-01-16 cryptsetup 2.7.3