How to reload udev rules without reboot?
How should one reload udev rules, so that newly created one can function?
I'm running Arch Linux, and I don't have a
/etc/rc.d, no udev service there.
Please note that more recent versions of udev have dropped the inotify support so the reloading of the rules on change is needed more often these days.
# udevadm control --reload-rules && udevadm trigger
@Nils Actually, you may need `udevtrigger` (or rather `udevadm trigger` on most distributions) instead (that, or plug the device out and back it). `--reload-rules` is almost always useless as it happens automatically.
`udevtrigger` or `udevadm trigger` did not work for me. I found some devices will work after unloading and loading the module for the same (assuming it is loadable module). What I found out is one does not necessarily have to reboot the system. Example for a network device, I do `rmmod ixgbe`, `rmmod tg3`,`rmmod e1000` then `modprobe ixgbe`, `modprobe tg3`,`modprobe e1000` depending on type of network driver.
Neither of things mentioned among the answers worked for me on Debian Jessie (8.0). The thing which worked is `ip link set $oldname name $newname` mentioned here. In my case, I needed to replace an iface named `lan` with a bridged iface (for KVM), and hence the original--now underlying--iface had to get its old name, `eth1`, back. So the trick was: 1) bring iface down; 2) fix network config up; 3) update udev naming rules file; 4) rename the iface using `ip link...`; 5) bring the bridge up.
Don't forget, you may need to unplug and plug the device back in to load the new rules for it.
I did have to `sudo udevadm trigger` after this, though removing the sudo didn't show any error, I didn't actually see any change until I ran it w/ sudo
On Debian testing 'udevadm trigger' does not work. I had to unplug and plug usb ethernet card only then udev triggered new rule.
I required `sudo udevadm trigger` instead of `udevadm trigger` as well. See my comments under this answer here: https://askubuntu.com/questions/1048870/permission-denied-to-non-root-user-for-usb-device/1187646#1187646. Doing it *with* sudo took ~2 sec, but doing it withOUT sudo took only ~0.2 sec. So clearly they are not doing the same thing for me.
@JacobMinshall, if you or anyone else confirms `sudo` is in fact required, as I think it is, here's an answer for that to be upvoted to indicate that: https://unix.stackexchange.com/questions/39370/how-to-reload-udev-rules-without-reboot/567996#567996.