[ntp:questions] Handle ntp conf modification when ntp is already running

David Lord snews at lordynet.org
Wed Apr 9 10:34:42 UTC 2014

Arthur Lambert wrote:
> Hi,
> Thank you for all your answer.
> So in fact Jochen, even if I need for some reason to handle dynamic
> change on ntp.conf, you are telling me that it is cleaner and better
> to restart the daemon ?
> I am currently putting some modification in my ntp conf file thanks to
> tr69 protocols. Moreover due to security constraints it is very hard
> for me to restart the ntp daemon.. It is quite strange that noone try
> to patch ntp daemon to handle runtime modification on ntp conf.
> I also tried to use confi-from-file feature from ntpq without success.
> I add a ntp url in my ntp conf and run ntpq -c config-from-file
> /etc/ntp.conf. Then I am not able to see my new ntp url by running
> ntpq -p command.


I've just tried adding an extra server using config-from-file
(ntp-dev-4.2.7p439 NetBSD-6)

config-from-file ntp.conf_add.2014040901
Sending configurstion file, one line at a time.
Keyid: 1
MD5 Password:
Line No: 1 Config Succeeded: server -4 xxx.xxxxx.xx.xx minpoll 8 maxpoll 
10 iburst
Done sending file
ntpq> quit

ntpq -p shows the added server

  remote          refid         st t    poll reach  delay offset jitter
+xxx.xxxxx.xx.xx xxxxxxxxxxxxx  2 u 193 256     7 22.334  2.349  0.113


> If I am able to create a clean patch to handle runtime modification I
> will be happy to share it.
> Regards,
> Arthur.
> 2014-04-09 5:34 GMT+02:00 E-Mail Sent to this address will be added to
> the BlackLists <Null at blacklist.anitech-systems.invalid>:
>> On 4/8/2014 2:49 PM, William Unruh wrote:
>>> On 2014-04-08, Arthur Lambert wrote:
>> ---------|---------|---------|---------|---------|---------|
>>>> I am currently using ntpd for my project.
>>>>  My need is to be able to use new ntp url when I put a
>>>>   new url in ntp.conf even if the ntp daemon is already running.
>>>>  Currently, I need to kill and reboot ntpd to be able to
>>>>   use the new ntp url set in my configuration file.
>>>>  i guess that my solution right now is to start ntpd in a
>>>>   hat process to be able to restart it if I detect a change
>>>>   in ntp conf file.
>>>> Do I have really to restart ntpd to see new ntp url ?
>>>> I tried to check option on ntpd to find a way to handle
>>>>  this case but I am not able to see this feature in the
>>>>  current implementation of ntpd
>> You would likely need to use a fairly bleeding edge Dev Release.
>> <http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-dev/>
>> <http://archive.ntp.org/ntp4/ntp-dev/>
>> e.g. Development  4.2.7p439  2014/04/03
>> <http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-dev/ntp-dev-4.2.7p439.tar.gz>
>> <http://archive.ntp.org/ntp4/ntp-dev/ntp-dev-4.2.7p439.tar.gz>
>>> I believe you can tell ntpd anthing that ntp.conf would by using ntpq.
>> :config
>>> I do not believe that there is a way of telling it to reread the .conf
>>> file.
>> config-from-file filename
>>  I haven't tried either (yet).
>> <http://www.eecis.udel.edu/~mills/ntp/html/ntpq.html>
>> or e.g. {In the case of the dev ver I last downloaded}
>> <ntp-dev-4.2.7p418/html/ntpq.html> See: Control-Message-Commands
>> <ntp-dev-4.2.7p418/ntpq/ntpq.html#Control-Message-Commands>
>> --
>> E-Mail Sent to this address <BlackList at Anitech-Systems.com>
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