NAME

uuidd - UUID generation daemon

SYNOPSIS

uuidd [options]

DESCRIPTION

The uuidd daemon is used by the UUID library to generate universally unique identifiers (UUIDs), especially time-based UUIDs, in a secure and guaranteed-unique fashion, even in the face of large numbers of threads running on different CPUs trying to grab UUIDs.

OPTIONS

-C, --cont-clock opt_arg
Activate continuous clock handling for time based UUIDs. uuidd could use all possible clock values, beginning with the daemon’s start time. The optional argument can be used to set a value for the max_clock_offset. This gurantees, that a clock value of a UUID will always be within the range of the max_clock_offset. '-C' or '--cont-clock' enables the feature with a default max_clock_offset of 2 hours. '-C<NUM>[hd]' or '--cont-clock=<NUM>[hd]' enables the feature with a max_clock_offset of NUM seconds. In case of an appended h or d, the NUM value is read in hours or days. The minimum value is 60 seconds, the maximum value is 365 days.
 
-d, --debug
Run uuidd in debugging mode. This prevents uuidd from running as a daemon.
 
-F, --no-fork
Do not daemonize using a double-fork.
 
-k, --kill
If currently a uuidd daemon is running, kill it.
 
-n, --uuids number
When issuing a test request to a running uuidd, request a bulk response of number UUIDs.
 
-P, --no-pid
Do not create a pid file.
 
-p, --pid path
Specify the pathname where the pid file should be written. By default, the pid file is written to {runstatedir}/uuidd/uuidd.pid.
 
-q, --quiet
Suppress some failure messages.
 
-r, --random
Test uuidd by trying to connect to a running uuidd daemon and request it to return a random-based UUID.
 
-S, --socket-activation
Do not create a socket but instead expect it to be provided by the calling process. This implies --no-fork and --no-pid. This option is intended to be used only with systemd(1). It needs to be enabled with a configure option.
 
-s, --socket path
Make uuidd use this pathname for the unix-domain socket. By default, the pathname used is {runstatedir}/uuidd/request. This option is primarily for debugging purposes, since the pathname is hard-coded in the libuuid library.
 
-T, --timeout number
Make uuidd exit after number seconds of inactivity.
 
-t, --time
Test uuidd by trying to connect to a running uuidd daemon and request it to return a time-based UUID.
 
-h, --help
Display help text and exit.
 
-V, --version
Print version and exit.

EXAMPLE

Start up a daemon, print 42 random keys, and then stop the daemon:
 
uuidd -p /tmp/uuidd.pid -s /tmp/uuidd.socket
uuidd -d -r -n 42 -s /tmp/uuidd.socket
uuidd -d -k -s /tmp/uuidd.socket

AUTHOR

The uuidd daemon was written by Theodore <[email protected]>Ts’o

SEE ALSO

uuid(3), uuidgen(1)

REPORTING BUGS

For bug reports, use the issue tracker at <https://github.com/util-linux/util-linux/issues>.

AVAILABILITY

The uuidd command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.

Recommended readings

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