1UUIDD(8) System Administration UUIDD(8)
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6 uuidd - UUID generation daemon
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9 uuidd [options]
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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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18 -d, --debug
19 Run uuidd in debugging mode. This prevents uuidd from running
20 as a 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 /run/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
48 the calling process. This implies --no-fork and --no-pid. This
49 option is intended to be used only with systemd(1). It needs to
50 be enabled 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 /run/uuidd/request. This option
55 is primarily for debugging purposes, since the pathname is hard-
56 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 -V, --version
66 Output version information and exit.
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68 -h, --help
69 Display help screen and exit.
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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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79 The uuidd daemon was written by Theodore Ts'o <tytso@mit.edu>.
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82 uuid(3), uuidgen(1)
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85 The uuidd daemon is part of the util-linux package and is available
86 from the Linux Kernel Archive ⟨https://www.kernel.org/pub/linux/utils
87 /util-linux/⟩.
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91util-linux July 2014 UUIDD(8)