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=] [--event-timeout=]
                                  [--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 daemon can be configured using udev.conf(5), its command line options, environment
       variables, and on the kernel command line, or changed dynamically with udevadm control.

OPTIONS

       -d, --daemon
           Detach and run in the background.

       -D, --debug
           Print debug messages to standard error.

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

       -e=, --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.

       -t=, --event-timeout=
           Set the number of seconds to wait for events to finish. After this time, the event will be
           terminated. The default is 180 seconds.

       -N=, --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.

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

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 log level.

       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.

       udev.event_timeout=, rd.udev.event_timeout=
           Wait for events to finish up to the given number of seconds. This option might be useful if events
           are terminated due to kernel drivers taking too long to initialize.

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

SEE ALSO

       udev.conf(5), udev(7), udevadm(8)

systemd 237                                                                             SYSTEMD-UDEVD.SERVICE(8)