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SYSTEMD-UDEVD.SERVICE(8)              systemd-udevd.service              SYSTEMD-UDEVD.SERVICE(8)



NAME
       systemd-udevd.service, systemd-udevd-control.socket, systemd-udevd-kernel.socket, systemd-
       udevd - Device event managing daemon

SYNOPSIS
       systemd-udevd.service

       systemd-udevd-control.socket

       systemd-udevd-kernel.socket

       /lib/systemd/systemd-udevd [--daemon] [--debug] [--children-max=] [--exec-delay=]
                                  [--resolve-names=early|late|never] [--version] [--help]

DESCRIPTION
       systemd-udevd listens to kernel uevents. For every event, systemd-udevd executes matching
       instructions specified in udev rules. See udev(7).

       The behavior of the running daemon can be changed with udevadm control.

OPTIONS
       --daemon
           Detach and run in the background.

       --debug
           Print debug messages to standard error.

       --children-max=
           Limit the number of events executed in parallel.

       --exec-delay=
           Delay the execution of RUN instructions by the given number of seconds. This option
           might be useful when debugging system crashes during coldplug caused by loading
           non-working kernel modules.

       --resolve-names=
           Specify when systemd-udevd should resolve names of users and groups. When set to early
           (the default), names will be resolved when the rules are parsed. When set to late,
           names will be resolved for every event. When set to never, names will never be
           resolved and all devices will be owned by root.

       --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

ENVIRONMENT
       $UDEV_LOG=
           Set the logging priority.

KERNEL COMMAND LINE
       Parameters starting with "rd." will be read when systemd-udevd is used in an initrd.

       udev.log-priority=, rd.udev.log-priority=
           Set the logging priority.

       udev.children-max=, rd.udev.children-max=
           Limit the number of events executed in parallel.

       udev.exec-delay=, rd.udev.exec-delay=
           Delay the execution of RUN instructions by the given number of seconds. This option
           might be useful when debugging system crashes during coldplug caused by loading
           non-working kernel modules.

       net.ifnames=
           Network interfaces are renamed to give them predictable names when possible. It is
           enabled by default; specifying 0 disables it.

CONFIGURATION FILE
       udev expects its main configuration file at /etc/udev/udev.conf. It consists of a set of
       variables allowing the user to override default udev values. All empty lines or lines
       beginning with '#' are ignored. The following variables can be set:

       udev_log
           The logging priority. Valid values are the numerical syslog priorities or their
           textual representations: err, info and debug.

SEE ALSO
       udev(7), udevadm(8)



systemd 215                                                              SYSTEMD-UDEVD.SERVICE(8)


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