The Network Time Protocol daemon (NTPd) is a daemon program that synchronizes the system time with time servers using the Network Time Protocol (NTP).

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Where can I see ntpd working status (log or message)

In my server the ntpd service is started but it does not seem to work. I can find nothing according to this ( Where are the ntpd log file located, and how can we configure the ntpd log file path? ) ...
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How can I synchronize system time with a NTP server continuously?

Is there a linux service that can synchronize system time with a NTP server with a given interval, such as 1 minute, 1 hour or 1 day ? Is it a good practice to run utpdate in a cron tab? e.g. */10 * ...
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Creating a badly behaved NTP server for testing

I'm trying to test behaviour of a server that's configured with a badly behaved NTP server, such as one that's drifting wildly or reporting times that jump around excessively. I've found lots of ...
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What is NTP dispersion and how do I control it?

We roll out Ubuntu 14.04 servers on isolated networks, running ntpd 4.2.6p5, configured to use multiple NTP servers as provided by customers (no access to pool.ntp.org). Our dumb terminal client ...
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Do I need ntpd on a LAMP server?

Do I need ntpd daemon/service on an LAMP server running Linux Debian 8.3? I am new to servers. I have already disabled some obvious ones, but I am not sure about this one. Thank you.
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Getting gpsd address for ntpd

I'm working through some tutorials for setting ntpd clock from gpsd. The guides that I'm working from list adding something like this: server 127.127.46.0 fudge 127.127.46.0 time1 0.0 time2 0.0 ...
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NTP synchronized clock alongside the system clock

Does NTP daemon(ntpd) provide some sort of virtual clock that it disciplines and serves, but not touch the system clock? Goal: On a realtime Linux OS, have a NTP synchronized clock alongside of the ...
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379 views

Ceph: HEALTH_WARN clock skew detected

I have configured ntp on Ceph nodes and time is synchronized! But ceph status always shows clock skew. ceph health detail shows: mon.node2 aadr 192.168.56.102:6789/0 clock skew 7192.45s > max ...
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80 views

NTP using GPS and PPS as clock, PPS is marked as falseticker

I am attempting to add a GPS-based clock source to my network, using a GPS which emits a 1-PPS clock pulse. This is connected to a GPIO pin. After allowing ntpd to run for 30 minutes or so, the PPS ...
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Centos 7: ntpstat unsynchronised

I'm setting up a server with a service that is very sensitive to date/time. So I'm trying to configure ntpd but it doesn't seems to work. I'm using the default Centos 7 configuration with the ...
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ntpdate -u ipaddress working but ntpd not updating the time

ntpdate -u ipaddress working fine but ntpd not updating the time. Please suggest what is the reason. [root@commander_a ~]# ntpdate -d 10.120.8.32 13 Jan 01:14:46 ntpdate[6172]: ntpdate 4.2.6p3@1.2290 ...
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Is it ok to run the `ntp` cronjob hourly?

I have several servers in Amazon EC2. Having noticed time difference on the instances I have installed ntp. I see /etc/cron.daily/ntp Cron job was added. Still I notice that, for some reason, the ...
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592 views

ntpd gets “connect: invalid argument” on 0.0.0.2

It appears the reply for pool.ntp.org changed recently. This is making my CentosOS 6 ntp servers unhappy. $ host pool.ntp.org pool.ntp.org has address 0.0.0.2 pool.ntp.org has address 83.209.8.142 ...
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101 views

NTP: Linux client won't sync with Win7 server running ntpd ( not w32time)

We have a 'bot with a Linux host running on an internal network connected only to a Win7 host. The Win7 host has internet access, but the Linux host does not. (historical reasons) When I load NTPD ...
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76 views

NTP not syncing automatically with my internal NTP server

I installed ntp on a centos server. I modified /etc/ntp.conf replacing the default server entries with one entry to my internal NTP server's IP (1.2.3.4 is the IP of the NTP server): server 1.2.3.4 ...
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62 views

Different offset in “ntpq -p” and “ntpdate -q”

I'm sometimes notified by our system monitoring about too high offsets in ntpd. When issuing ntpdate, it shows none. As ntpd adjusts time slowly, it seems to "think" there is an offset which needs to ...
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Is it possible for NTP to have two system peers at the same time?

In some rare cases, ntpq -p reports here that it has two system peers, like this (IPs and results anonymized): remote refid st t when poll reach delay offset disp ...
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Is it possible to increase the rate at which ntpd updates the system clock?

We have some hosts that have gotten out of sync due to ntpd being mis-configured, with an ntp server that was unreachable. Our clocks on some hosts (CentOS 6) are now upwards of 30 seconds off (in the ...
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112 views

How accurate can we get computer clocks synchronized in a local network of any number of computers?

In the past, I have seen that most of my computer on my local network don't really have the same time within up to 1 second or so. So I wanted to make sure that it would be possible for a stack of ...
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44 views

Why is the NTP local fudge server no longer reachable?

For many years I have had: server 127.127.1.0 # local clock fudge 127.127.1.0 stratum 10 In my /etc/ntp.conf configs - it always worked as I expected it to: ie. was mostly useless but for those ...
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NTP: Should I configure NTP step-tickers in a domain which uses local NTP servers?

I've bumped into something which is called "NTP step tickers" and read about it in this article, but I'm not sure if it's required in a domain which includes local NTP servers. It seems like it ...
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Likely causes of NTPD dying unexpectedly and solutions

On a web application which uses s3 for physical document storage, we are experiencing issues with NTP continuously dying. This seems to happen roughly once or twice a day. There is very little ...
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ntp.conf pool vs server directives

I came across an ntp.conf file that specifies pool directives: # Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board # on 2011-02-08 (LP: #104525). See ...
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Linux ntpd leap second preparation

There will be a leap second on June 30, 2015 at 23:59:60 UTC. I have a Linux based stratum 1 NTP server which uses GPS as a reference clock. The server is using the "default" ntp.org ntpd. How ...
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ntpd does not communicate with external servers when I listen to addresses

After some hours I managed to synchronize a public server with external ntp servers. Now I can synchronize my desktop machine with that server through a vpn connection. But I want to know why I can't ...
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35 views

UDel ntpd - completely disable time server discovery

I configured UDel ntpd (version 4.2.6.p5) as a client to three servers operated by my organization, and (I thought) no one else. server xx.yy.zz.1 iburst server xx.yy.zz.2 iburst server xx.yy.zz.3 ...
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Leap second addition in linux - how to make sure kernel detects it correctly

For the upcoming leap second addition on June 30 I have been working on making sure the Red Hat Linux detects the time smoothly. I have installed the updated tzdata and ntpd package on all RHEL5 and ...
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209 views

CentOS 5.5 32 bit “service ntpd restart” issue or not?

I have CentOS 5.5 32 bit. I have a service provider that enables NTP on their routers. They have checked and doubled check their access list and I can ping the time servers but I'm getting a strange ...
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535 views

CentOS 7 ntpd not synchronize with AD domain controller

i've a problem with time syncronization of a CentOS 7 host with a Windows 2008 R2 Domain controller. If I use the command ntpdate -u host.domain the synchronization is ok. But using ntpd the time is ...
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ntpd daemon doesn't start automatically in FreeBSD

I wanted to setup ntpd the right way - so not with a crontab entry. I followed the guide in the FreeBSD docs: create an entry with ntpd_enable="YES" in /etc/rc.conf checked that everything works ...
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ntpd error: unable to bind to wildcard address 0.0.0.0 - another process may be running - EXITING

I have a problem. Time on server not synchronized. And it seems that this problem was appear after I set my rules for iptables, which I described here May be I'm wrong and these two events are not ...
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ntpd: servers stuck on .INIT

I am trying to set up an NTP server for my local network, but ntpd refuses to sync with outer servers. # ntptrace localhost: stratum 16, offset 0.000000, synch distance 0.396285 # ntpq -pn ...
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NTP running, server time is wrong on VM

The server time was 7 hours off (instead of 10AM it was 3AM, even though date showed the correct timezone). The output for ntpq was: $ ntpq -p remote refid st t when poll reach ...
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Tracing chain of NTP servers

For educational purposes I wanted to trace a chain of NTP servers, e.g. 0.de.pool.ntp.org back to a stratum 1 NTP server. How can I do this? I found ntptrace, but it doesn't work: /home/xyzdragon# ...
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ntpd logging debug to ntpd.log

using ntpd 4.2.6p5 on redhat 6.5 How do I configure /etc/ntp.conf to generate debug messages to logfile? in /etc/ntp.conf I have logfile /var/log/ntpd.log but that only does very basic entries. ...
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ntpd servers stuck in init state when defined by hostname, but sync correctly when defined by IP address

I started having an issue on a couple of our colo servers which is causing a fair bit of head scratching. I as alerted to clock skew on a couple of servers, and when I went to investigate ntpq -=p ...
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How to have ntpd serve only my local subnet

I have a few servers with public Internet IP addresses like A.B.C.x. One of my hosts (A.B.C.10) runs ntpd and I have it syncing it's time from europe.pool.ntp.org. Now I only want to allow hosts ...
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NTP Version Check

How can I check other NTP server's NTP version without query the server? NTPv3 and NTPv4 network packet is different, and I know I can just catch the packet and analysis it when ntpd is doing sync. ...
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NTP not sync the time continuously, Have to restart the service of NTP then it SYNC in Ubuntu

I am facing one problem. NTP server not sync the time automatically. If I change the the time of system then NTP server not able to correct it. After reboot the service of NTP it sync the time ...
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Ubuntu server time jumping away

I wanted to write "drifting away" in the header but this is not what's happening. I have an Ubuntu 12.04 LTS server running some web apps. On 25.10.2014 I updated tzdata to the latest version and ...
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which are the most accurate ntpd fudge factors for gps nmea

I use ntpd with GPS NMEA with PPS as follows server 127.127.20.0 mode 18 minpoll 4 maxpoll 4 prefer fudge 127.127.20.0 flag1 1 flag2 0 flag3 1 flag4 0 time2 0.475 flag1 enables PPS signal ...
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865 views

configuration to use gps time with no internet connection

I use ntp with a GPS device with PPS on port /dev/ttyS0. All seems to be fine if the machine is connected to the internet. Output looks correct. But if there is no internet connection I get: $ ntpq ...
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616 views

Access NMEA reference clock and GPS position simultaneously

I noticed two approaches to get an accurate time from GPS (with PPS). Using ntpd either with NMEA reference clock or Shared Memory Driver My problem: I want to have a very accurate time and access ...
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313 views

CentOS configure ntpd to serve DST/localtime

I know that ntp uses UTC and the clients have to manage any DST and timezone differences on their own. The problem I have is that several noname ip cameras have a non-working DST implementation, and ...
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206 views

How should I manage and troubleshoot NTP issues?

For some time now I've been fighting with some NTP issues in my company's network and I'm having a hard time to understand how the commands combine with the service. For example: In the server's ...
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131 views

NTPD slews time when it doesn't need to

I have some odd behaviour running ntpd on a rhel 6.5 machine. This machine runs as a virtual machine on a kvm host (also rhel) and this host has the correct time (within a few ms), and an ntpd that ...
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481 views

ntpd server closing unexpectedly [slackware 14.1 64bit linux]

I have an ntpd server running on to provide time for all pc's inside my office. lately it has started switching off unexpectedly. there is nothing in the logs: 30 Aug 02:25:43 ntpd[1590]: peers ...
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278 views

SES time sync error

My SES setup was running fine for the last 6 months without any issues. All of a sudden it stopped working yesterday and I'm gettinng the infamous time sync error. Naturally I assumed ntpd had ...
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Using puppet to manage ntpd certificates

My company is requiring me to implement signed time in ntpd with autokey. One of the requirements for autokey to work is to generate keys on each host. All the clients are part of the same group so ...
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How far is “too far off” for ntpd? Can it get there by a sudden jump to heavy load? Can this be overridden?

In many primers on ntpd, like this one, there's always a warning that ntpd will stop resetting the clock "[if] your clock is too far off." How far off is "too far off"? Also, if a server takes a ...