How to reload "udev rules" without restarting udev service?

Environment

• Red Hat Enterprise Linux 8
• Red Hat Enterprise Linux 7
• Red Hat Enterprise Linux 6

Issue

• After changing the udev rules configuration in /etc/udev/rules.d/, how to reload rules configuration without restarting "udev" service using start_udev?

Resolution

1. Make the changes in udev configuration.

2. If it's not possible to reboot the server, udevadm trigger can be utilized to reload the new rules configuration in udev:

# /sbin/udevadm control --reload-rules
# /sbin/udevadm trigger --type=devices --action=change

Or, for a specific event run the following command:

# echo change > /sys/block/<device>/uevent

Refer man udevadm for more details.
More documentation is available on the system in /usr/share/doc/udev-147/writing_udev_rules/index.html.

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