I deal with that, ntpd as a daemon on my linux server by default configuring， but where should we look up the log file? Is there any log file normal, and if not , how can we configure that?
ntpd logs basic messages to syslog, so where those logs go is dependent on your syslog configuration, but
/var/log/syslog or common places to look.
ntpd can also generate statistics if
statsdir is defined in
/etc/ntp.conf and you have some
filegen definitions. Here is the documentation for statsdir and filegen.