systemd Developer Kay Sievers kay@vrfy.org systemd-udev.service 8 systemd-udev.service systemd-udev-control.socket systemd-udev-kernel.socket systemd-udevd Device event managing daemon systemd-udev.service systemd-udev-control.socket systemd-udev-kernel.socket /usr/lib/systemd/systemd-udevd --daemon --debug --children-max= --exec-delay= --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 stderr. --children-max= Limit the number of parallel executed events. --exec-delay= Number of seconds to delay the execution of RUN instructions. This might be useful when debugging system crashes during coldplug cause 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. --version Print version number. --help Print help text. UDEV_LOG= Set the logging priority. The parameters starting with "rd.", will be read when udev 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 parallel executed events. udev.exec-delay= rd.udev.exec-delay= Number of seconds to delay the execution of RUN instructions. This might be useful when debugging system crashes during coldplug cause by loading non-working kernel modules. udev7 , udevadm8