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Old 10-08-2015, 01:19 AM   #1
SimonTap
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Registered: Oct 2015
Posts: 2

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Confussion about how linux and ntpd deal with time


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I am running an NTP-Server on my lubuntu 15.04 box. The server uses the local system clock as its only time source.

/etc/ntp.conf

Code:
driftfile /var/lib/ntp/ntp.drift
server 127.127.1.0 prefer
restrict 127.127.1.0
fudge 127.127.1.0 stratum 10
Timezone of the server is GMT+1 (due to summertime it results in UTC+2 at the moment). When I set the clock using date I see the time is 00:00:00 which is fine.

Code:
user@ubuntu:$ sudo  date --set=00:00:00
Mi 7. Okt 00:00:00 GMT+1 2015
user@ubuntu:$ date
Mi 7. Okt 00:00:02 GMT+1 2015
If a ntp-client queries the time it gets 01:00:00 as the value of the transmit timestamp. Can anyone explain to me why? As ntp relies on UTC I would expect it to report 22:00:00.

Last edited by SimonTap; 10-08-2015 at 06:37 AM. Reason: Solved
 
Old 10-08-2015, 06:35 AM   #2
SimonTap
LQ Newbie
 
Registered: Oct 2015
Posts: 2

Original Poster
Rep: Reputation: Disabled
I was able to solve it. Due to the possix standard the signs of GMT in
Code:
zoneinfo/Etc/
are exactly the opposite of what one would expect. When I say berlin (germany) is in GMT+1 the filename is
Code:
zoneinfo/Etc/GMT-1
 
  


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