● isc-dhcp-server.service - LSB: DHCP server
   Loaded: loaded (/etc/init.d/isc-dhcp-server)
   Active: failed (Result: exit-code) since Thu 2017-10-26 18:58:14 CEST; 11s ago
  Process: 682 ExecStop=/etc/init.d/isc-dhcp-server stop (code=exited, status=0/SUCCESS)
  Process: 759 ExecStart=/etc/init.d/isc-dhcp-server start (code=exited, status=1/FAILURE)

Oct 26 18:58:12 LINUX_LOVE dhcpd[766]: All rights reserved.
Oct 26 18:58:12 LINUX_LOVE dhcpd[766]: For info, please visit https://www.isc.org/software/dhcp/
Oct 26 18:58:12 LINUX_LOVE dhcpd[766]: Wrote 3 leases to leases file.
Oct 26 18:58:12 LINUX_LOVE dhcpd[766]: Can't bind to dhcp address: Address already in use
Oct 26 18:58:12 LINUX_LOVE dhcpd[766]: Please make sure there is no other dhcp server
Oct 26 18:58:14 LINUX_LOVE isc-dhcp-server[759]: Starting ISC DHCP server: dhcpdcheck syslog for diagnostics. ... failed!
Oct 26 18:58:14 LINUX_LOVE isc-dhcp-server[759]: failed!
Oct 26 18:58:14 LINUX_LOVE systemd[1]: isc-dhcp-server.service: control process exited, code=exited status=1
Oct 26 18:58:14 LINUX_LOVE systemd[1]: Failed to start LSB: DHCP server.
Oct 26 18:58:14 LINUX_LOVE systemd[1]: Unit isc-dhcp-server.service entered failed state.