1SYSTEMD-UDEVD.SERVICE(8)     systemd-udevd.service    SYSTEMD-UDEVD.SERVICE(8)
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NAME

6       systemd-udevd.service, systemd-udevd-control.socket, systemd-udevd-
7       kernel.socket, systemd-udevd - Device event managing daemon
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SYNOPSIS

10       systemd-udevd.service
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12       systemd-udevd-control.socket
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14       systemd-udevd-kernel.socket
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16       /usr/lib/systemd/systemd-udevd [--daemon] [--debug] [--children-max=]
17                                      [--exec-delay=] [--event-timeout=]
18                                      [--resolve-names=early|late|never]
19                                      [--version] [--help]
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DESCRIPTION

22       systemd-udevd listens to kernel uevents. For every event, systemd-udevd
23       executes matching instructions specified in udev rules. See udev(7).
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25       The behavior of the daemon can be configured using udev.conf(5), its
26       command line options, environment variables, and on the kernel command
27       line, or changed dynamically with udevadm control.
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OPTIONS

30       -d, --daemon
31           Detach and run in the background.
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33       -D, --debug
34           Print debug messages to standard error.
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36       -c=, --children-max=
37           Limit the number of events executed in parallel.
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39       -e=, --exec-delay=
40           Delay the execution of RUN instructions by the given number of
41           seconds. This option might be useful when debugging system crashes
42           during coldplug caused by loading non-working kernel modules.
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44       -t=, --event-timeout=
45           Set the number of seconds to wait for events to finish. After this
46           time, the event will be terminated. The default is 180 seconds.
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48       -N=, --resolve-names=
49           Specify when systemd-udevd should resolve names of users and
50           groups. When set to early (the default), names will be resolved
51           when the rules are parsed. When set to late, names will be resolved
52           for every event. When set to never, names will never be resolved
53           and all devices will be owned by root.
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55       -h, --help
56           Print a short help text and exit.
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58       --version
59           Print a short version string and exit.
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KERNEL COMMAND LINE

62       Parameters starting with "rd." will be read when systemd-udevd is used
63       in an initrd.
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65       udev.log_priority=, rd.udev.log_priority=
66           Set the log level.
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68       udev.children_max=, rd.udev.children_max=
69           Limit the number of events executed in parallel.
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71       udev.exec_delay=, rd.udev.exec_delay=
72           Delay the execution of RUN instructions by the given number of
73           seconds. This option might be useful when debugging system crashes
74           during coldplug caused by loading non-working kernel modules.
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76       udev.event_timeout=, rd.udev.event_timeout=
77           Wait for events to finish up to the given number of seconds. This
78           option might be useful if events are terminated due to kernel
79           drivers taking too long to initialize.
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81       net.ifnames=
82           Network interfaces are renamed to give them predictable names when
83           possible. It is enabled by default; specifying 0 disables it.
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85       net.naming-scheme=
86           Network interfaces are renamed to give them predictable names when
87           possible (unless net.ifnames=0 is specified, see above). With this
88           kernel command line option it is possible to pick a specific
89           version of this algorithm and override the default chosen at
90           compilation time. Expects one of the naming scheme identifiers
91           listed in systemd.net-naming-scheme(7), or "latest" to select the
92           latest scheme known (to this particular version of
93           systemd-udevd.service).
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95           Note that selecting a specific scheme is not sufficient to fully
96           stabilize interface naming: the naming is generally derived from
97           driver attributes exposed by the kernel. As the kernel is updated,
98           previously missing attributes systemd-udevd.service is checking
99           might appear, which affects older name derivation algorithms, too.
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SEE ALSO

102       udev.conf(5), udev(7), udevadm(8)
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106systemd 243                                           SYSTEMD-UDEVD.SERVICE(8)
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