Linux "uuidd" Command Line Options and Examples

UUID generation daemon

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 run‐ ning on different CPUs trying to grab UUIDs..

Usage:

uuidd [options]

Command Line Options:

-d

Run uuidd in debugging mode. This prevents uuidd from running as a daemon.


                            uuidd -d ...

-F

Do not daemonize using a double-fork.


                            uuidd -F ...

-k

If currently a uuidd daemon is running, kill it.


                            uuidd -k ...

-n

When issuing a test request to a running uuidd, request a bulk response of number UUIDs.


                            uuidd -n ...

-P

Do not create a pid file.


                            uuidd -P ...

-p

Specify the pathname where the pid file should be written. By default, the pid file is written to/run/uuidd/uuidd.pid.


                            uuidd -p ...

-q

Suppress some failure messages.


                            uuidd -q ...

-r

Test uuidd by trying to connect to a running uuidd daemon and request it to return a random-based UUID.


                            uuidd -r ...

-S

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 enabledwith a configure option.


                            uuidd -S ...

-s

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-codedin the libuuid library.


                            uuidd -s ...

-T

Make uuidd exit after number seconds of inactivity.


                            uuidd -T ...

-t

Test uuidd by trying to connect to a running uuidd daemon and request it to return a time-based UUID.


                            uuidd -t ...

-V

Output version information and exit.


                            uuidd -V ...

-h

Display help screen and exit.EXAMPLEStart up a daemon, print 42 random keys, and then stop the daemon:uuidd -p /tmp/uuidd.pid -s /tmp/uuidd.socketuuidd -d -r -n 42 -s /tmp/uuidd.socketuuidd -d -k -s /tmp/uuidd.socketAUTHORThe uuidd daemon was written by Theodore Ts'o <tytso@mit.edu>.


                            uuidd -h ...