I am now trying to start DHCP client on GigabitEthernet3/0/0 interface with following steps. Unfortunately it does not support to process option 6-domain server while DHCP server has acknowledge with domain server.

Now I have an use case with 1 WAN and 3 LAN interfaces. The DHCP client works on WAN interface to get dynamic IP address, gateway and domain server. DNS proxy need to start and config with domain server when it gets from DHCP client. Finally the device from LAN area can send DNS request to DNS proxy to resolve domain name.

vpp# set int state GigabitEthernet3/0/0 up
vpp# set dhcp client intfc GigabitEthernet3/0/0
vpp# sh dhcp client verbose
[0] GigabitEthernet3/0/0 state DHCP_BOUND addr 192.168.1.34/24 gw 192.168.1.1
retry count 0, next xmt 86455.90

From wireshark:
Your (Client) IP address: 192.168.1.34
Option: (53) DHCP Message Type (ACK)
Length: 1
DHCP: ACK (5)
Option: (3) Router
    Length: 4
    Router: 192.168.1.1
Option: (6) Domain server
    Length: 4
    Domain Name Server: 192.168.1.1