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UUIDD

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

−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 /run/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 /run/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.

−V, −−version

Output version information and exit.

−h, −−help

Display help screen 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 AT mit DOT edu>.

SEE ALSO

uuid(3), uuidgen(1)

AVAILABILITY

The uuidd daemon is part of the util-linux package and is available from the Linux Kernel Archive.

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