Questions tagged [ntpd]

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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systemctl restart ntp failing with error: unable to bind to wildcard address

We're running ntpd Ver. 4.2.8p4 on Ubuntu 16.04.6 LTS on ~100 physical servers distributed worldwide, with the configuration file /etc/ntp.conf managed centrally via puppet. If the configuration is ...
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NTP - After how much delay would NTP select a remote server in the pool?

A selected server will be indicated by *. But how much time will this take to select a peer from the pool if ntp service is restarted? I'm trying to monitoring NTP server offset but every time i ...
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Can I use both pool and server configurations in ntp?

For a ntp demon, what happens if I have this configuation in ntp.conf: pool 0.pool.ntp.org burst iburst minpoll 4 server europe.pool.ntp.org ? How will ntp be configured? I don't know there to be ...
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ntp.conf stepout adjustments

I’ve been reading over ntp documentation and I’m not quite sure I’m wrapping my head around ‘stepout’. We have a large environment of Linux VM’s that require ‘tinker panic 0’ to be set. ntp is ...
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NTP client not able to auto sync with server

I have connected a system with NTP client on a local network with windows system on which NTP server is running. The problem is client is not able to sync the time with server. NTP version: 4.2.8p13 (...
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Keeping Ubuntu clock in sync with another machine using NTP

Goal To synchronize the clock of machine A (Ubuntu 18.04) with the clock of machine B (Ubuntu 16.04 on local network running an NTP server - time is approx. 10 minutes ahead of real-world time). My ...
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What happens when ntp stops sync with remote ntp server and LOCAL (127.0.0.1) is also not defined in the ntp.conf

I wish to understand the scenario in which we have defined only remote servers in the /etc/ntp.conf file and we have not set the LOCAL ntp server (127.0.0.1) options. What happens in case of a ...
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manycast servers aren't used (receive: AM_MANYCAST drop: bad auth || (NOPEER|NOTRUST))

I created an NTP configuration for SLES12 SP4 (ntp-4.2.8p13) where only selective interface addresses are being used, and I tried to discover statum-1 and startum-2 servers via manycast (ACST) in our ...
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154 views

all my ntpd servers marked falsetick, why?

I have a set of four ntpd servers that sync time from the same stratum 1 server. But on some clients they all are marked falsetick, why? remote refid st t when poll reach delay ...
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885 views

Setting up an NTP server from LAN - KoD packet has inconsistent xmt/org/rec timestamps. Ignoring

I'm setting up a NTP server on my Ubuntu machine and I want my Raspberry Pi's and (eventually) Window's machines to sync from it. I thought things would be pretty straight forward, however I'm ...
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Local GPS clock is marked as falseticker by ntpd — why?

I have a Linux NTP server with a ublox M8Q GPS module connected via GPIO (UART @ 9600bps and PPS). What I observe is that the local GPS source — SHM(0) — gets marked as falseticker and I'd like to ...
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CentOS sending out NTP packets while NTP service is stopped

NTP service is stopped, still my CentOS machine is sending out NTP packets to a NTP server: # service ntpd status ntpd is stopped
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385 views

centos 7 NTP configuration

I am trying to configure ntp.conf with a stratum 1 server and also a peer VM on the same network. Config file is attached below. The problem is server with the IP address 10.6.11.171 does not seem to ...
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querying data from NTP in ubuntu using socket

I have configured ntp to use gpsd as reference server on my machine. I am querying data from ntp directly, using udp socket. For ip address I use localhost and port_number = 123. Packet structure I ...
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Can you configure a specific interface to reach the NTP server?

I have to configure NTP on a CentOS server. I have 7 interfaces and I can reach the NTP server through one interface. Also the server doesn't have access to internet. When I try ping: ping 10.0.10....
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ntp + ntp loose synchronize each time in 5:00 morning

we have a very strange behavior we have 12 Linux redhat machines - redhat 7.x two of these VM servers are loosing the time synchronize each day at 5:00 in the morning after we restart the chronyd , ...
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54 views

Set up a NTP server which can be queried globally

I want to set up a server (hosted on aws/or a running system in some part of the world) as an NTP server that can be queried globally. Currently, I have modified the ntp.conf file on the node to be ...
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Using GPS as only source for NTP daemon

I have questions regarding the use of a GPS receiver as an external clock source for realization of a time server with NTP daemon (client version 3), on a local network with no connection to external ...
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535 views

Query on NTP current time source

I have a query regarding ntpd options and the ntpq command. I have set up a local NTP Server in Ubuntu 14.04 PC and NTP Client is a custom development platform based on Renesas RZ/G1H. I have ...
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461 views

ntp offset with stratum 1 , when using stratum 2

I was searching for a solution but didn't find clear answer. In my company, all our servers are syncing time with one of our private ntp servers (which are stratum 3 if I'm correct). These stratum 3 ...
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SOLVED NTP No Server Suitable For Synchronization Found Centos

I'm trying to set up an ntp server, and I can't query it. Whenever I try, I get this message: 6 Mar 18:57:01 ntpdate[27050]: no server suitable for synchronization found Here is my ntpd.conf file #...
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NTP Stratum Won't “Fudge”

I have two servers, blue and green. I want blue to pull time from green but it won't because the stratum on green is too high. Green has a regular internet connection. Blue does not. In googling ...
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Time is going too fast on FreeBSD 12 on compute engine

I have created a FreeBSD VM on Google cloud engine. The image is installed with ntpd configured and is running: $service ntpd status ntpd is running as pid 4950. But date is in the future, the time ...
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666 views

ntpdate take long time to sync (not ntpd)

I have referred ntpdate -d Server dropped Strata too high. This is a similar but different question. I having two devices. Freescale ARM board (NTP server) Tinker board (client) In the Freescale ...
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350 views

standalone NTP config

I am trying to setup local NTP server for some testing. I have installed NTP on Ubuntu 18.04 and commented server-pool block in the config file Here is the full config : driftfile /var/lib/ntp/ntp....
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55 views

Deny NTP servers with stratum more than specific level

How can I deny in my /etc/ntp/ntp.conf to sync with the NTP server with specific stratum level (e.g. more than 5 )? I have a bad NTP server in my local network and sometimes is going really wrong ...
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844 views

Behavior when not writing ntp.conf restrict

if I don't write restrict in ntp.conf , so ntp restrict is Unlimited? I wrote: interface ignore wildcard interface listen lo interface listen lan0 man page http://doc.ntp.org/current-stable/accopt....
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Ntpd on local network - Preventing clock drift causing high offsets

I have a local network with a microcontroller ARM as the NTP server and I have a desktop computer running with ubuntu 16.04 LTS as a NTP client. Once I start ntpd -g -c /etc/ntp.conf with the ...
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centOs : system time getting reset back to UTC after changing it using timedatectl

I have a Centos machine with version 7. I am trying to change the system time using the timedatectl command. The time gets changed but after a few seconds it gets reset back to it's original time. [...
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CentOS 4.6 Time Drift

I have a CentOS 4.6 box that was previously a physical device, and has been made into a VM, that has a cronjob to restart the server everyday at 23:00. Which is fine. However, since the shift to ...
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ntp doesn't sync - Server has gone too long without sync

I'm unable to sync with ntp server. Any suggestions on how to force the ntpdate to work and sync? ntp.conf on clients are default with only the server address changed. ntpdate -dv 10.10.10.10 26 Sep ...
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Stop NTP from listening on ports.

On my server, the time should be fetched. It should no be provided to other servers. I would call this a client. But it seams that NTP is by default running in server mode, since it is opening ports ...
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1k views

Is ntp working or not?

I do not understand the output of ntpd. My question: Is the server foohost able to get the time from 30.251.32.1? Here is my config: foohost:/var/log # cat /etc/ntp.conf tinker panic 0 disable ...
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Does ntpd need to be enabled on Ubuntu 16.04

I recently noticed people attempting to ntpd reflection attacks on my server. So my questions are, how necessary is it that ntpd stays enabled, and how can I enable and disable it?
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ntpd -q lists no servers

I am trying to set up ntpd on my servers, so that their clocks are kept in sync. I am running Ubuntu 16.04. I have followed these instructions, and everything seems fine until the end. It's now a ...
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NTP doesn't seem to be enabled and synchronised in Debian Jessie

When I follow steps below in Ubuntu, NTP is enabled and synchronised. However, the case is opposite in Debian Jessie. Anybody knows the reason why Debian says "no"? Also should I worry at all since ...
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How to do proper VPS timekeeping?

I'm configuring a VPS to log some time-series online data and I notice that the time is off. I'd like to have better than 10 second precision on this. I read somewhere that VPS timekeeping is ...
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Do “service ntpd restart” and “ntpdate <ntp-server-ip>” do the same work?

I often get large offsets when checking ntpd using ntpq -p, I generally restart the ntp daemon and it fixes the issue. I wanted to know if i can try the ntpdate <ntp-server-name> instead of ...
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2k views

How to enable NTP module CentOS 7?

I have one server running CentOS 7 to install ntp module I followed the below steps: yum install -y ntp systemctl start ntpd systemctl enable ntpd systemctl status ntpd timedatectl set-timezone ...
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How to force locally isolated ntpd update time

Objective I had locally isolated hosts. I'd like them all have the same time. One takes role of the time server, other syncs with it as clients. All machines has sporadic uptime. They are powered ...
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711 views

Minimalistic Linux NTP configuration for broadcast server and broadcast client

I would like to have a minimalistic NTP configuration setup for multiple Linux computers that are completely isolated from the Internet, sitting on the same network, which synchronise their clock to ...
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NTP Autokey IFF not working as expected

A) TARGET ARCHITECTURE We have a project where the target NTP time synchronisation architecture is the following: Stratum 1 servers provided by the customer. Stratum 2 servers: Spectracom SecureSync ...
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2k views

CentOS 7 - ntp stuck .INIT

I've two ntp servers with one client server. NTP servers are sync time OK. The client stuck on .INIT. step but sync manually works. The client ping and have allowed policies with NTP servers. Alls ...
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293 views

NTP peer's upstream source has same IP causing sync loop

I have an NTP server configured to use another NTP server (10.128.0.10) as its time source. Due to some network address translation, my NTP server (192.0.2.1) has the same IP address as the peer's ...
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NTP rejecting upstream due to “peer_dist”

Currently NTP is rejecting its upstream and is drifting quite badly (15 seconds of offset so far and growing). When checking the reason using ntpq the flash code is flash=400 peer_dist. Checking the ...
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334 views

Timesyncd with NTP server using md5

I have a FreeBSD server used as an NTP server with md5 as authentication. If I want to connect to it from a FreeBSD/Linux machine which has ntpd, I can simply add something along the lines of server ...
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NTP Service Auto-Discovery

Are there any methods I could use to provide auto-discovery for NTP? I recently moved to a new job that has a parent company that recently started providing Active Directory. I've been implementing ...
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407 views

Why is my 1PPS GPS stratum-1 clock always ~100ms behind other ntp servers?

I am trying to set up a stratum-1 time server. I have a Navisys GR-701 GPS which is capable sending a 1 PPS signal. According to the spec sheet and sources such as this, I am under the impression I ...
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2k views

ntpq -pn gets timeout, (because i think) nptd doesn't bind to ::1, why?

Linux myhost 4.1.12-103.7.1.el7uek.x86_64 #(host edited) Red Hat Enterprise Linux Server release 7.4 (Maipo) ntpd - NTP daemon program - Ver. 4.2.6p5 ntp-4.2.6p5-25.0.1.el7_3.2.x86_64 /etc/ntp.conf: ...
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Using host as ntp-client and lxc-router as ntp-server

I installed ntpd on my Debian host machine to keep the hardware RTC "up-to-date". By sharing the system's clock the time gets automatically propagated to all installed containers (lxc). One of those ...

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