UUID generation daemon


uuidd [options]


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.


-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,--uuidsnumber 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,--pidpath 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,--socketpath 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,--timeoutnumber 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.


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


The uuidd daemon is part of the util-linux package and is available from the https:// www.kernel.org /pub /linux /utils /util-linux/ Linux Kernel Archive .


uuid(3), uuidgen(1)


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

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