UDEVD(8)

📦 version 3.2.14, in alpine 3.22, alpine 3.23, alpine 3.24

💖 UDEVD(8) 💖

okay so this is the udevd page from the udevd manual — yes the section is literally named after itself, main character energy fr fr 👑

✨ NAME ✨

udevd — the device event managing daemon 🎀

✨ SYNOPSIS ✨

udevd

/sbin/udevd [--daemon] [--debug] [--children-max=] [--exec-delay=]
            [--event-timeout=] [--resolve-names=early|late|never]
            [--version] [--help]

✨ DESCRIPTION ✨

so bestie, udevd listens to kernel uevents. that's the whole vibe. for every single event that comes in, udevd executes the matching instructions that are specified in udev rules. see udev(7) for the tea ☕

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 you can change it dynamically with udevadm control. so many ways to customize her, she's flexible like that 💅

✨ 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 😭 (been there)
  • -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 30 seconds ⏰
  • -N, --resolve-names= — specify when 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 — that's it, that's the option 🫶 (the page gives it no blurb, so i'm not gonna invent one, iykyk)

✨ KERNEL COMMAND LINE ✨

heads up bestie — parameters starting with "rd." will be read when 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) 🌈

ngl this one is short and sweet, go read the other pages for the full lore bestie, love that for you 💜

okay bye ily, this was eudev presenting UDEVD(8) 💖✨🎀🦋🌸💅🫶

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