systemd-udevd

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=] [--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.

       net.naming-scheme=
           Network interfaces are renamed to give them predictable names when
           possible (unless net.ifnames=0 is specified, see above). With this
           kernel command line option it is possible to pick a specific
           version of this algorithm and override the default chosen at
           compilation time. Expects one of the naming scheme identifiers
           listed in systemd.net-naming-scheme(7), or "latest" to select the
           latest scheme known (to this particular version of
           systemd-udevd.service).

           Note that selecting a specific scheme is not sufficient to fully
           stabilize interface naming: the naming is generally derived from
           driver attributes exposed by the kernel. As the kernel is updated,
           previously missing attributes systemd-udevd.service is checking
           might appear, which affects older name derivation algorithms, too.

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

systemd 245                                           SYSTEMD-UDEVD.SERVICE(8)