uuidd(8) — Linux manual page


UUIDD(8)                    System Administration                   UUIDD(8)

NAME         top

       uuidd - UUID generation daemon

SYNOPSIS         top

       uuidd [options]

DESCRIPTION         top

       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         top

       -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         top

       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         top

       The uuidd daemon was written by Theodore Ts'o <tytso@mit.edu>.

SEE ALSO         top

       uuid(3), uuidgen(1)

AVAILABILITY         top

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

COLOPHON         top

       This page is part of the util-linux (a random collection of Linux
       utilities) project.  Information about the project can be found at 
       ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.  If you have a
       bug report for this manual page, send it to
       util-linux@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2020-06-09.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-06-08.)  If you discover any
       rendering problems in this HTML version of the page, or you believe
       there is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

util-linux                        July 2014                         UUIDD(8)

Pages that refer to this page: uuid_generate(3)uuid_generate_random(3)uuid_generate_time(3)uuid_generate_time_safe(3)