1UUIDD(8)                     System Administration                    UUIDD(8)
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NAME

6       uuidd - UUID generation daemon
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SYNOPSIS

9       uuidd [options]
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DESCRIPTION

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

18       -d, --debug
19           Run uuidd in debugging mode. This prevents uuidd from running as a
20           daemon.
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22       -F, --no-fork
23           Do not daemonize using a double-fork.
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25       -k, --kill
26           If currently a uuidd daemon is running, kill it.
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28       -n, --uuids number
29           When issuing a test request to a running uuidd, request a bulk
30           response of number UUIDs.
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32       -P, --no-pid
33           Do not create a pid file.
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35       -p, --pid path
36           Specify the pathname where the pid file should be written. By
37           default, the pid file is written to {runstatedir}/uuidd/uuidd.pid.
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39       -q, --quiet
40           Suppress some failure messages.
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42       -r, --random
43           Test uuidd by trying to connect to a running uuidd daemon and
44           request it to return a random-based UUID.
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46       -S, --socket-activation
47           Do not create a socket but instead expect it to be provided by the
48           calling process. This implies --no-fork and --no-pid. This option
49           is intended to be used only with systemd(1). It needs to be enabled
50           with a configure option.
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52       -s, --socket path
53           Make uuidd use this pathname for the unix-domain socket. By
54           default, the pathname used is {runstatedir}/uuidd/request. This
55           option is primarily for debugging purposes, since the pathname is
56           hard-coded in the libuuid library.
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58       -T, --timeout number
59           Make uuidd exit after number seconds of inactivity.
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61       -t, --time
62           Test uuidd by trying to connect to a running uuidd daemon and
63           request it to return a time-based UUID.
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65       -h, --help
66           Display help text and exit.
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68       -V, --version
69           Print version and exit.
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EXAMPLE

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

79       The uuidd daemon was written by Theodore Ts’o <tytso@mit.edu>.
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SEE ALSO

82       uuid(3), uuidgen(1)
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REPORTING BUGS

85       For bug reports, use the issue tracker at
86       https://github.com/util-linux/util-linux/issues.
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AVAILABILITY

89       The uuidd command is part of the util-linux package which can be
90       downloaded from Linux Kernel Archive
91       <https://www.kernel.org/pub/linux/utils/util-linux/>.
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95util-linux 2.38                   2022-02-17                          UUIDD(8)
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