uuidd - 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 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, --uuids
number
- 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, --pid
path
- 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, --socket
path
- 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, --timeout
number
- 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 was written by Theodore Ts'o
<tytso@mit.edu>.