Questions about the NTP protocol and applications that use it. NTP is an acronym for Network Time Protocol.

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Installing NTP and DHCP servers in Ubuntu Server

I have just installed Ubuntu Server in VirtualBox. My homework requires that I install and configure DHCP and NTP server. Alright, so the first thing is installing them! sudo apt-get install ntp ...
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0answers
11 views

ntp possible on ad hoc network in ubuntu ? 12.04 onwards

I am doing a research project on Vehicular Ad hoc networks.. I am using C programming language for socket programming, with four laptops installed with Ubuntu 12.04 and 14.04 versions. All the laptops ...
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0answers
14 views

How does the ntpd -N work?

I read on the ntpd man page that ntpd -N runs the ntpd at the highest priority to the extent permitted by the operating system. I want to know how this works? Which are the kernel processes which ...
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0answers
49 views

How to configure NTP time sync on a controller node

In a new installation of ICEhouse on Window8.1 Host and VMware VMs - 3 node configuration, I don't know how to configure ntp all nodes. Ther are 3 node Controller Node , Network Node and Compute ...
2
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1answer
71 views

Is there a way to make ntpd -gq run faster

This question is related to this question and this earlier question I asked on serverfault. Per my previous question, I'm interested in synchronizing the time on my machine in a fast (ideally less ...
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40 views

Ubuntu NTP time wrong after reboot

Running 12.04LTS for a while now. When we reboot, the server comes on with the time 46 minutes slow. nearly every reboot. We installed ntp (apt-get install ntp) so the time does auto-correct after 4-5 ...
-1
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1answer
164 views

How do I make my laptop act as an NTP server in LAN without connecting to the internet?

I need to set my laptop as an NTP server within my own local area network. From what I notice, I am able to sync the client to my NTP server in a local area network ONLY when a.) There is an ...
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0answers
649 views

server time drift not fixed by ntp.conf

This question was asked a lot in the past, but since ntpdate has been depricated, I'm having issues finding answers that work via ntp.conf. I've read a lot about setting a cron job for ntpdate is a ...
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1answer
93 views

Check if NTP Client Daemon is Working properly Using NTPDC

How can i check if a NTP client is working properly solely by using ntpdc command? Thanks
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1answer
1k views

Setting up a standalone NTP server on Ubuntu

I want to setup a standalone NTP server on Ubuntu. The problem is all the tutorials i see on the internet are about how to make the server to synchronize with another time server on the internet and ...
2
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1answer
200 views

NTP: Use unprivileged ports

I have had some trouble with ntdpate on EC2, which was solved by using the -u argument for unprivileged ports: $ sudo ntpdate -u ntp.nasa.gov time-b.nist.gov I know that ntpd is better than a ...
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2answers
216 views

Can't run ntpdate on EC2

I have had some serious issues with time accuracy on my Ubuntu EC2 machines, with drifts of more than 60 seconds. A possible solution is running ntpdate or ntp, but I can't get them to work on EC2: ...
2
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1answer
102 views

Force ntpd to have offset from time server

Is it possible to force ntpd to have a fixed time offset, e.g. 10 minutes, to another server? To be able to test that our devices do nicely sync with a single ntp source, we would like enable/disable ...
2
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1answer
3k views

ntpdate “ no server suitable for synchronization found”

I have tried to disable the firewall and allow the port 123 as explained in other questions, but it didnt help me, it keeps telling me $ sudo ntpdate -u pool.ntp.org 5 May 05:41:40 ntpdate[3614]: ...
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0answers
49 views

start ntpd -qg after network connection

I am trying to synchronise two machines that connected over ad-hoc network. None of the computers are connected to the internet. One computer doesn't have a Real Time Clock, so everytime I reset it, ...
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0answers
69 views

Is there a program for analyzing NTP server statistics?

I'm running Ubuntu 12.04 and have the NTP server running, apparently OK. I run the Meinberg NTP server on my two Windows 7 boxes and use its associated server monitor to keep track of what it's up to. ...
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2answers
26k views

ntpdate: no server suitable for synchronization found

My clock is off, so I would like to synchronize it using ntpdate. I tried several different NTP servers, but for some reason I always get the following error message: $ sudo ntpdate ntp.ubuntu.com 4 ...
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2answers
133 views

How to sync time ubuntu desktop 13.10 client with Centos6.4 server using ntp

I have NTP server setup on my CentOS6.4 server and am trying to sync my Ubuntu 13.10 Desktop (AMD) client with it. I figured this would be easy having heard positive things about Ubuntu but it's not ...
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3answers
2k views

“ntpd unable to bind to wildcard address 0.0.0.0 - another process may be running”

On my Ubuntu 13.04 (using AWS). When I start a new machine or when I reboot my machine ntp does not start and I see the following in the syslog: Jan 10 02:56:49 ntpd: unable to bind to wildcard ...
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1answer
60 views

How to time sync two systems in same network?

I want my laptop to derive it's clock time from another system which is located in another building.Both the systems use Ubuntu 12.04
3
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1answer
3k views

How to change the time server in ubuntu 12.04 LTS without installing the `ntp` package

I am on Ubuntu 12.04 LTS, in the dialog "Time and Date settings" there is a set of radio buttons labeled as "Set the time", the two options are "Manually" and "Automatically from the Internet": My ...
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0answers
187 views

NTP service, offset increasing after sync

I have installed Ubuntu 12.10 version on my PC. I am running NTP service having NTP server as GPS. I found that when we start NTP service by ntp start command, PC is able to sync with GPS as I get ...
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0answers
213 views

NTPD segfaults on 12.04 LTS (64-bit)

Fresh install of Ubuntu 12.04 LTS. Installed ntp, but starting the service only results in the following error: grsec: Segmentation fault occurred at 0000000000000008 in /usr/sbin/ntpd[ntpd:28951] ...
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0answers
400 views

Synchronise clocks on ubuntu running in EC2?

I've got three servers running on AWS EC2 using official Ubuntu AMIs using paravirtualisation. I have noticed their clocks are out of sync by about a minute. NTP is not installed by default in the ...
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2answers
1k views

Should I run 'ntpdate' regularly or should I use the NTP service?

I think there are two solutions for keeping the time in sync on my machine. One is to run an NTP service, another is to run the ntpdate regularly by putting it in a crontab. This is how I understand ...
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1answer
818 views

Unable to locate ntpd package

I am trying to install ntp for my server. However, on running sudo apt-get install ntpd i get the response Unable to locate package ntpd. I have run sudo apt-get update and the problem still remains
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1answer
615 views

enable/disabling NTP server

Our application runs on ubuntu 12.04 precise. On this server, we have both ntpdate and ntp. How to enable and disable NTP service on-demand? I tried 'sudo update-rc.d -f ntp remove/default' and 'sudo ...
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0answers
117 views

How to configure NTP with permanent slew adjustments?

There are several questions that I hope the community can assist with: Is the following approach correct and a recommended best practice? Would ntpd with the -x option be persistent even after a ...
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1answer
1k views

ntp date not showing the correct time [duplicate]

I was having an issue in which the time my ubuntu machine was showing is 5 hours ahead of my standard time. So I installed ntpd for that using apt-get install ntp after that I restarted ntp but ...
4
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1answer
2k views

Disable daily anacron mail updates

Every day, I get the following mail delivered by postfix: From: Anacron <root@name.domain> To: root@name.domain Subject: Anacron job 'cron.daily' on name Content-Type: text/plain; ...
3
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2answers
2k views

Time sync between ubuntu and windows

Iam working as a linux admin. In our company we are using a ubuntu server with windows clients. The time in each clients are not same. Is it possible to sync time from ubuntu server with the windows ...
5
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2answers
11k views

What units does the ntp drift file use?

When the ntpd daemon is running, the file: /var/lib/ntp/ntp.drift gets updated periodically. Example: 17:20 hostname 118 ~> ls -l /var/lib/ntp/ntp.drift -rw-r--r-- 1 ntp ntp 7 May 20 16:46 ...
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1answer
9k views

ntpd vs ntpdate: pros and cons

In order to keep the time accurate on a Ubuntu system one can either: Run the ntpd (network time protocol daemon) which will run all the time and continuously adjust the system time when clocks ...
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0answers
194 views

system clock is 5.5 ahead although ntp

time zone here is Asia/Tehran, but the ubuntu time is 5H30M ahead of local time. I've checked configs and even installed ntp server, nothing seem to fix this, sudo dpkg-reconfigure tzdata Current ...
5
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2answers
2k views

Ubuntu inside virtual machine: ntpd or ntpdate or ??? to avoid clock drift

Problem: ntpd, when installed on a virtual machine running Ubuntu (I've had this on hosts with a variety of hypervisors such as KVM and VMware ESX) seem to be prone to severe clock drift. I haven't ...
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0answers
42 views

Clock issue in Ubuntu 12.10 [duplicate]

I could see that my clock does not work right. For example, now it's 15:49, and Ubuntu has 16:10. It takes the time from Internet and I don't know why change it when it wants. /etc/default/ntp it ...
59
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7answers
160k views

How to force a clock update using ntp?

I am running Ubuntu on an ARM based embedded system that lacks a battery backed RTC. The wake-up time is somewhere during 1970. Thus, I use the NTP service to update the time to the current time. I ...
14
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2answers
19k views

Unable to synchronize time using NTP

When I try to synchronize time using NTP. Using the below command sudo ntpdate -b pool.ntp.org I get this error saying NTP socket is in use. How to fix this? 18 Jan 05:53:49 ntpdate[21340]: the ...
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2answers
659 views

What is the package and background process for “network time”?

What is the background process of "network time" in gnome control center (gnome system settings)? Is there a package providing this feature? I've noticed that neither ntp nor openntpd are installed ...
4
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3answers
6k views

Can I use NTP service through a proxy?

Can I use NTP service through proxy? how to do it? I want NTP auto sync my clock through proxy.
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4answers
20k views

“no server suitable for synchronization found” error when trying to run `ntpdate`

I am trying to setup the NTP server on Ubuntu machine. Am breaking my head in this particular issue. Getting an error ntpdate[5005]: no server suitable for synchronization found when doing the ...
19
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2answers
26k views

How to configure NTP time synchronization on a server?

I would like to configure my Ubuntu 12.04 server to synchronize its clock with a specific NTP server. Where to set this up?
15
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2answers
23k views

Where does ntpdate get its settings from and what is the “no servers can be used” error about?

When I run ntpdate on its own, I get the following output: 8 Jun 15:47:46 ntpdate[31251]: no servers can be used, exiting If I run it with the -q ntp.ubuntu.com switch, it seems to query just ...
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3answers
9k views

Timezone appears to be set correctly, but time is 7 hours off

I'm installing ubuntu 12.04. On the time/date settings, I tried to click on Seattle (where I am), but it only registered Vancouver. I modified the ntp config files to use the north american pool, if ...
14
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4answers
6k views

Why is Ubuntu's clock getting slower or faster?

Ubuntu's clock is off by about a half hour: Where do I even start troubleshooting this? It's allegedly being set "automatically from the Internet". How can I verify that "the Internet" knows what ...
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8answers
11k views

How do I customize the NTP poll rate?

I'm setting up Ubuntu on an embedded machine that runs over a cellular connection, where we pay per byte. The machine also has no RTC battery, so it starts from a random time every boot. I'd like to ...
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2answers
6k views

ntpd server always in 'INIT' mode

I'm running ntpd server in my ubuntu (10.04) machine. But it is always stays in the 'INIT' state as shown below. lyra@ws07475:~$ ntpq -p remote refid st t when poll reach delay ...
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1answer
353 views

Time problem causes IMAP server to fail

I've had a problem with my system time, when I execute the following: date && touch test && stat test I get this result: Sun Jan 22 17:52:07 MSK 2012 File: test Size: 0 ...
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4answers
28k views

What is the command to update time and date from internet

What is the command to update time and date from Internet. Is there any application that allows me to do so graphically?
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1answer
4k views

How to change time servers?

I'm behind a firewall, so I can't access pool.ntp.org or Ubuntu's own time servers directly, and I'd like to change the time servers for my system. When googling, I find references to missing manpages ...