on ubuntu (1)process name: dhcpd (2)service name: isc-dhcp-server (3)cfg folder: /etc/dhcp/ (4)lease folder: /var/lig/dhcpd/ (5)log file: /var/log/syslog (6)port cfg: /etc/default/isc-dhcp-server
on centos (1)process name: dhcpd (2)service name: dhcpd, dhcpd6 (3)cfg folder: /etc/dhcp/ (4)lease folder: /var/lig/dhcpd/ (5)log file: /var/log/message (6)port cfg: /etc/systemd/system/dhcpd.service, /etc/systemd/system/dhcpd.service