File: //proc/thread-self/root/etc/systemd/system/cloud-init.target.wants/cloud-init-hotplugd.socket
# cloud-init-hotplugd.socket listens on the FIFO file
# /run/cloud-init/share/hook-hotplug-cmd which is created during a
# udev network add or remove event as processed by
# 10-cloud-init-hook-hotplug.rules.
# Known bug with an enforcing SELinux policy: LP: #1936229
[Unit]
Description=cloud-init hotplug hook socket
[Socket]
ListenFIFO=/run/cloud-init/share/hook-hotplug-cmd
SocketMode=0600
[Install]
WantedBy=cloud-init.target