Open Source Software

systemd-udevd(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=] [--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

   --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.

   --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.

   --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.

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)



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