Differences

This shows you the differences between two versions of the page.

--- linux:ntp [2019/06/19 16:11] – tmade
+++ linux:ntp [2020/07/08 17:42] (current) – tmade
@@ Line 7: / Line 7: @@
 Commands:
-  ntptrace                  #Show sync stats
+  ntptrace                                                   #Show sync stats
-  watch -n1 -d ntptrace     #Show continiously sync stats
+  watch -n1 -d ntptrace                                      #Show continiously sync stats
-  ntpq -p                   #NTP query program
+  ntpq -p                                                    #NTP query program
-  ntpq -pn                  #NTP query program. showing IP instead of DNS name
+  ntpq -pn                                                   #NTP query program. showing IP instead of DNS name
+  ntpdate -s time.server.com && /sbin/hwclock --systohc
+  ntpdate -b time.server.com                                 #force sync - ntpd has to been switched off during sync!
 "offset":
-Shows timedifference between reference time (timeserver) and system time
+Shows timedifference between reference time (timeserver) and system time (OS)
 "jitter":
-Gibt die Größenordnung der Schwankungen zwischen einzelnen Zeitvergleichen an.
+Indicates the magnitude of the fluctuations between individual time comparisons
+(worst case) Example:
+<code>
+[root@testsap ~]# ntpq -pn
+     remote           refid      st t when poll reach   delay   offset  jitter
+==============================================================================
+*10.200.1.11     192.168.47.125    4 u  652 1024  377    0.545    0.944   1.939
++10.200.1.12     192.168.47.126    5 u  705 1024  377    0.469    1.579   3.187
++10.200.1.13     192.168.47.12     6 u  592 1024  377    0.342    2.999  22.494
+</code>
 Check from a Linux-Client: