Man page - uuidd(8)

Packages contains this manual

Package:  uuid-runtime
apt-get install uuid-runtime

Manuals in package:
• uuidd(8)
• uuidparse(1)
• uuidgen(1)
Documentations in package:
• uuid-runtime

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Manual

UUIDD

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLE
AUTHOR
SEE ALSO
REPORTING BUGS
AVAILABILITY

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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 [ = time ]

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 guarantees, that a clock value of a UUID will always be within the range of the max_clock_offset.

The option -C or --cont-clock enables the feature with a default max_clock_offset of 2 hours.

The option -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

Display 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 Ts’o <tytso@mit.edu>.

SEE ALSO

uuid (3), uuidgen (1)

REPORTING BUGS

For bug reports, use the issue tracker <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/>.

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