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UNIX for Dummies Questions & Answers
Time synchronization
Post 42444 by Neo on Wednesday 29th of October 2003 03:44:40 PM
10-29-2003
Administrator
The safest way to protect your computer is to disconnect it from the network 
if you want to sync your date, use ntpdate. You don't have to open any well known ports to use an NTP client. The port you are speaking of is for an NTP server..... client processes do not use the same port... they use much higher port numbers.
Neo
if you want to sync your date, use ntpdate. You don't have to open any well known ports to use an NTP client. The port you are speaking of is for an NTP server..... client processes do not use the same port... they use much higher port numbers.
Neo
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LEARN ABOUT XFREE86
systemd-timesyncd.service
SYSTEMD-TIMESYNCD.SERVICE(8) systemd-timesyncd.service SYSTEMD-TIMESYNCD.SERVICE(8) NAME
systemd-timesyncd.service, systemd-timesyncd - Network Time Synchronization SYNOPSIS
systemd-timesyncd.service /lib/systemd/systemd-timesyncd DESCRIPTION
systemd-timesyncd is a system service that may be used to synchronize the local system clock with a remote Network Time Protocol server. It also saves the local time to disk every time the clock has been synchronized and uses this to possibly advance the system realtime clock on subsequent reboots to ensure it monotonically advances even if the system lacks a battery-buffered RTC chip. The systemd-timesyncd service specifically implements only SNTP. This minimalistic service will set the system clock for large offsets or slowly adjust it for smaller deltas. More complex use cases are not covered by systemd-timesyncd. The NTP servers contacted are determined from the global settings in timesyncd.conf(5), the per-link static settings in .network files, and the per-link dynamic settings received over DHCP. See systemd.network(5) for more details. timedatectl(1)'s set-ntp command may be used to enable and start, or disable and stop this service. FILES
/var/lib/systemd/timesync/clock This file contains the timestamp of the last successful synchronization. SEE ALSO
systemd(1), timesyncd.conf(5), systemd.network(5), systemd-networkd.service(8), timedatectl(1), localtime(5), hwclock(8) systemd 237 SYSTEMD-TIMESYNCD.SERVICE(8)