correct way to set timezone & clock/date?
Steven A. DuChene
linux-clusters at mindspring.com
Tue Aug 25 12:50:24 MST 2009
My Cox cable modem has a time display that is set by their network and the time on my system
is set to under a minute different than that display. Besides if I cannot get any sort of reply
from the ntp servers how can I tell what time they are synced to?
--
Steve
-----Original Message-----
>From: Alex Dean <alex at crackpot.org>
>Sent: Aug 25, 2009 3:45 PM
>To: "Steven A. DuChene" <linux-clusters at mindspring.com>, Main PLUG discussion list <plug-discuss at lists.plug.phoenix.az.us>
>Subject: Re: correct way to set timezone & clock/date?
>
>How far off is your current time from the ntp server's time? If
>they're way out of whack, I think ntp will refuse to synchronize. I
>forget how large of a disparity it will handle, but if they're an
>entire hour different, it might just do nothing. I'd expect an error
>message in that case, though. Try setting the system time with 'date'
>to something close to the ntp server's time, then start up the ntp
>process again.
>
>alex
>
>On Aug 25, 2009, at 2:43 PM, Steven A. DuChene wrote:
>
>> Hmm, Here it never starts doing those transmit packets after
>> locating the servers.
>>
>> I just tried it with the firewall turned off and I still get the
>> same result so it must not be the firewall.
>> I am on a Cox cable modem. I wonder if Cox blocks NTP on their
>> network?
>> --
>> Steve
>>
>> -----Original Message-----
>>> From: Eric Shubert <ejs at shubes.net>
>>> Sent: Aug 25, 2009 3:33 PM
>>> To: plug-discuss at lists.plug.phoenix.az.us
>>> Subject: Re: correct way to set timezone & clock/date?
>>>
>>> Here's what I get on a test server of mine:
>>> [root at dellefield ~]# ntpdate -v -d dewey.lib.ci.phoenix.az.us
>>> ntp.drydog.com
>>> 25 Aug 12:28:28 ntpdate[6149]: ntpdate 4.2.2p1 at 1.1570-o Tue May 19
>>> 13:58:06 UTC 2009 (1)
>>> Looking for host dewey.lib.ci.phoenix.az.us and service ntp
>>> host found : dewey.lib.ci.phoenix.az.us
>>> Looking for host ntp.drydog.com and service ntp
>>> host found : rrcs-66-27-60-10.west.biz.rr.com
>>> transmit(148.167.132.200)
>>> receive(148.167.132.200)
>>> transmit(148.167.132.200)
>>> receive(148.167.132.200)
>>> transmit(148.167.132.200)
>>> transmit(66.27.60.10)
>>> receive(148.167.132.200)
>>> transmit(148.167.132.200)
>>> receive(148.167.132.200)
>>> transmit(148.167.132.200)
>>> receive(66.27.60.10)
>>> transmit(66.27.60.10)
>>> receive(66.27.60.10)
>>> transmit(66.27.60.10)
>>> receive(66.27.60.10)
>>> transmit(66.27.60.10)
>>> receive(66.27.60.10)
>>> transmit(66.27.60.10)
>>> server 148.167.132.200, port 123
>>> stratum 2, precision -20, leap 00, trust 000
>>> refid [148.167.132.200], delay 0.09081, dispersion 0.01126
>>> transmitted 4, in filter 4
>>> reference time: ce3eb3eb.9159d1f0 Tue, Aug 25 2009 12:03:07.567
>>> originate timestamp: ce3eb9de.49e55521 Tue, Aug 25 2009 12:28:30.288
>>> transmit timestamp: ce3eb9de.43a0f909 Tue, Aug 25 2009 12:28:30.264
>>> filter delay: 0.11383 0.13196 0.11774 0.09081
>>> 0.00000 0.00000 0.00000 0.00000
>>> filter offset: 0.002299 0.012727 0.005610 -0.00813
>>> 0.000000 0.000000 0.000000 0.000000
>>> delay 0.09081, dispersion 0.01126
>>> offset -0.008137
>>>
>>> server 66.27.60.10, port 123
>>> stratum 2, precision -21, leap 00, trust 000
>>> refid [66.27.60.10], delay 0.28584, dispersion 0.00227
>>> transmitted 4, in filter 4
>>> reference time: ce3eb980.f314d607 Tue, Aug 25 2009 12:26:56.949
>>> originate timestamp: ce3eb9df.19c5555c Tue, Aug 25 2009 12:28:31.100
>>> transmit timestamp: ce3eb9de.f711a543 Tue, Aug 25 2009 12:28:30.965
>>> filter delay: 0.29257 0.28622 0.28584 0.30823
>>> 0.00000 0.00000 0.00000 0.00000
>>> filter offset: 0.002869 0.004561 0.005198 -0.00578
>>> 0.000000 0.000000 0.000000 0.000000
>>> delay 0.28584, dispersion 0.00227
>>> offset 0.005198
>>>
>>> 25 Aug 12:28:31 ntpdate[6149]: adjust time server 148.167.132.200
>>> offset
>>> -0.008137 sec
>>> [root at dellefield ~]#
>>>
>>> So the ntp servers are ok. Are you in a position to stop the firewall
>>> momentarily for a test to be sure that's where your blockage is?
>>>
>>> Steven A. DuChene wrote:
>>>> I ran the following:
>>>>
>>>> ntpdate -v -d dewey.lib.ci.phoenix.az.us ntp.drydog.com
>>>>
>>>> and it looked for and found both hosts but then just sits there with
>>>> no other output.
>>>> --
>>>> Steve
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: Eric Cope
>>>> Sent: Aug 25, 2009 3:10 PM
>>>> To: Main PLUG discussion list
>>>> Subject: Re: correct way to set timezone & clock/date?
>>>>
>>>> You can force an update, instead of waiting on the incremental
>>>> changes. But, as noted below, it may affect services.
>>>> Eric
>>>>
>>>> On Tue, Aug 25, 2009 at 11:42 AM, Jon M. Hanson
>>>> <jon at the-hansons-az.net <mailto:jon at the-hansons-az.net>> wrote:
>>>>
>>>> ntp also adjusts your clock gradually so it won't immediately
>>>> jump to
>>>> the correct time. This is to prevent problems with services
>>>> (like cron
>>>> and logging) that depend on a clock that doesn't suddenly
>>>> change.
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Aug 25, 2009, at 11:33 AM, Alex Dean <alex at crackpot.org
>>>> <mailto:alex at crackpot.org>> wrote:
>>>>
>>>>> Try tailing /var/log/messages (you said this was fedora, right?)
>>>>> when you start up the ntp daemon. It can take a while (>1 minute
>>>>> sometimes) for the time servers to synchronize, but you
>>>> should see
>>>>> some log activity during that time to show you that it's working.
>>>>>
>>>>> alex
>>>>>
>>>>> On Aug 25, 2009, at 1:27 PM, Steven A. DuChene wrote:
>>>>>
>>>>>> Hmm, so I did the following:
>>>>>>
>>>>>> # iptables -A input_ext -p tcp -m tcp --dport 123 -j ACCEPT
>>>>>>
>>>>>> and then tried starting ntp services again but it still
>>>> seems to hang
>>>>>> when trying to get the initial date and time. So adding a
>>>> rule to the
>>>>>> firewall for tcp access on port 123 seems to have made no
>>>> difference
>>>>>> to my problem.
>>>>>>
>>>>>> nuts...
>>>>>> --
>>>>>> Steve
>>>>>>
>>>>>> -----Original Message-----
>>>>>>> From: "kitepilot at kitepilot.com
>>>> <mailto:kitepilot at kitepilot.com>" <kitepilot at kitepilot.com
>>>> <mailto:kitepilot at kitepilot.com>>
>>>>>>> Sent: Aug 25, 2009 2:13 PM
>>>>>>> To: "Steven A. DuChene" <linux-clusters at mindspring.com
>>>> <mailto:linux-clusters at mindspring.com>>, Main PLUG
>>>>>>> discussion list <plug-discuss at lists.plug.phoenix.az.us
>>>> <mailto:plug-discuss at lists.plug.phoenix.az.us>>
>>>>>>> Subject: Re: correct way to set timezone & clock/date?
>>>>>>>
>>>>>>> From /etc/services
>>>>>>>
>>>>>>> ntp 123/tcp
>>>>>>> ntp 123/udp # Network Time
>>>>>>> Protocol
>>>>>>>
>>>>>>> I would use "ntp" instead of "udp", and if it doesn't work,
>>>> take a
>>>>>>> dump...
>>>>>>> :)
>>>>>>> ET
>>>>>>>
>>>>>>
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>>>>>
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>>>>
>>>>
>>>>
>>>> --
>>>> Eric Cope
>>>> http://cope-et-al.com
>>>>
>>>>
>>>
>>>
>>> --
>>> -Eric 'shubes'
>>>
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>>
>>
>>
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