Operation Manual
25.3 Dynamic Time Synchronization
at Runtime
If the system boots without network connection, ntpd starts up, but it cannot resolve
DNS names of the time servers set in the conguration le. This can happen if you use
Network Manager with an encrypted WLAN.
If you want ntpd to resolve DNS names at runtime, you must set the dynamic option.
Then, when the network is establish some time after booting, ntpd looks up the names
again and can reach the time servers to get the time.
Manually edit /etc/ntp.conf and add dynamic to one or more server entries:
server ntp.example.com dynamic
Or use YaST and proceed as follows:
1
In YaST click Network Services > NTP Conguration.
2
Select the server you want to congure. Then click Edit.
3
Activate the Options eld and add dynamic. Separate it with a space, if there
are already other options entered.
4
Click Ok to close the edit dialog. Repeat the previous step to change all servers
as wanted.
5
Finally click Ok to save the settings.
25.4 Setting Up a Local Reference
Clock
The software package ntp contains drivers for connecting local reference clocks. A list
of supported clocks is available in the ntp-doc package in the le /usr/share/
doc/packages/ntp-doc/refclock.html. Every driver is associated with a
number. In ntp, the actual conguration takes place by means of pseudo IP addresses.
Time Synchronization with NTP 415