systemd Developer Kay Sievers kay@vrfy.org systemd-udevd.service 8 systemd-udevd.service systemd-udevd-control.socket systemd-udevd-kernel.socket systemd-udevd Device event managing daemon systemd-udevd.service systemd-udevd-control.socket systemd-udevd-kernel.socket /usr/lib/systemd/systemd-udevd --daemon --debug --children-max= --exec-delay= --event-timeout= --resolve-names=early|late|never --version --help systemd-udevd listens to kernel uevents. For every event, systemd-udevd executes matching instructions specified in udev rules. See udev7 . The behavior of the running daemon can be changed with udevadm control. --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 30 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 $UDEV_LOG= Set the logging priority. 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. 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. 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. udev7 , udevadm8