user@svr01:~$ date
Wed Jun 19 00:39:52 +08 2019

user@svr01:~$ tail -F /var/log/syslog
Jun 19 00:34:26 svr01 systemd[1]: isc-dhcp-server6.service: Main process exited, code=exited, status=1/FAILURE
Jun 19 00:34:26 svr01 systemd[1]: isc-dhcp-server6.service: Failed with result 'exit-code'.
Jun 19 00:34:56 svr01 systemd-networkd-wait-online[1485]: Event loop failed: Connection timed out
...