NAME¶
uuidd - UUID generation daemon
SYNOPSIS¶
uuidd [
options]
DESCRIPTION¶
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¶
- -d, --debug
- Run uuidd in debugging mode. This prevents uuidd from running as a
daemon.
- -h, --help
- Display help screen and exit.
- -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, --pid path
- Specify the pathname where the pid file should be written. By default, the
pid file is written to /run/uuidd/uuidd.pid.
- -P, --no-pid
- Do not create pid file.
- -F, --no-fork
- Do not daemonize using double-fork.
- -S, --socket-activation
- Do not create the socket and instead expect it to be provided by the
calling process. Implies --no-fork and --no-pid. As of this writing, this
option is supposed to be used only with systemd. This option must be
enabled with a configure option.
- -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 path
- Specify the pathname used for the unix-domain socket used by uuidd. By
default, the pathname used is /run/uuidd/request. This is primarily for
debugging purposes, since the pathname is hard-coded in the libuuid
library.
- -T, --timeout timeout
- Specify a timeout for uuidd. If specified, then uuidd will exit after
timeout 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.
EXAMPLE¶
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¶
The
uuidd daemon was written by Theodore Ts'o <tytso@mit.edu>.
AVAILABILITY¶
The uuidd daemon is part of the util-linux package and is available from
ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
SEE ALSO¶
uuid(3),
uuidgen(1)
