DHCP for physical network adapter

I finally created a service that invokes dhclient.

$ sudo vi /etc/systemd/system/eth0.service

[Service]
Type=oneshot
ExecStart=/bin/bash -c "dhclient -i eth0"

[Install]
WantedBy=systemd-networkd.service
$ sudo systemctl enable /etc/systemd/system/eth0.service
$ sudo systemctl restart systemd-networkd
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