Questions tagged [time-synchronization]

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4
votes
4answers
870 views

Sync ntp immediately at boot with undiciplined clock

I have setup one ntp server and 5 clients. I want to force sync the clients to server clock on boot. With my current ntp settings the computers are syncing but after several minutes. I cannot wait so ...
1
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1answer
81 views

Best practice for external NTP Server on Windows AD network

I have a Windows Hyper-V network. I have 2 domain controllers; both are VMs. DC1 runs on Host01 and DC2 runs on Host02. On each Domain Controller: w32tm /query /source returns VM IC Time ...
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0answers
68 views

w32tm not syncing my DC's time like I would expect

I have an issue where my domain controller (a HyperV VM) is not syncing the time with the external time server as expected. The status shows it has recent syncs going on but the time still never ...
0
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1answer
72 views

Windows Client Time Sync with Domain Controller(s) not working properly

I can confirm my domain controller (primary and backup) are syncing with a time server correctly. They're within +0.0002 or so seconds last I checked. I can confirm this with w32tm /monitor from the ...
0
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1answer
630 views

How to Set Up Time Synchronization with NTP on Ubuntu 20.04.1 LTS

After updating the base system with the latest available packages: apt-get update -y and root@localhost:~# timedatectl Local time: Wed 2021-01-06 08:03:11 UTC Universal time:...
-1
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1answer
77 views

chrony time synchronization problems

We have a cluster where exact time synchronization is very important. We use Ubuntu 20.04 servers and and chrony. Unfortunately there are always problems with time synchronization. No other known time ...
0
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1answer
311 views

DC NTP not syncing and Local CMOS Clock issue

I've configured my DC (Domain Controller; Windows 2016) as described here to get his time from my Sophos-UTM. So i configured the GPO as described there. But after that and a restart of the server i ...
0
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2answers
295 views

NTP synchronizing always in local

I have an Ubuntu 16.04 with the following NTP configuration: driftfile /var/lib/ntp/drift restrict -4 default kod nomodify notrap nopeer noquery restrict -6 default kod nomodify notrap nopeer noquery ...
0
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1answer
205 views

Programmatically detect Chrony time sync events

I am working on a sensor system, which runs on an embedded Linux platform and doesn't have access to the internet. An external GPS time server device is connected to provide time synchronization using ...
1
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0answers
145 views

PPS Integration with chrony

I am trying to get chrony to ingest a PPS signal to compare against just an NTP server. The PPS signal is recognized when I do ppswatch and ppstest, but when I do chronyc sources, the LastRX field ...
-1
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1answer
57 views

How to change time on local NTP server and distribute to others? [closed]

Is there any solution to retrieve time from a NTP server and change time locally (Increase or decrease) and then distribute new time to other servers? As an example, server retrieve UTC time and ...
2
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2answers
1k views

Azure AD Joined Windows 10 Workstations | Time Sync?

I'm looking in to understanding how Time Sync works with a Win 10 Azure AD Joined laptop/workstation. Looking at my laptop, I noticed that Windows Time is not started and set to manual. Starting it ...
4
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1answer
12k views

Ubuntu 20.04 time sync problems and possibly incorrect status information

I have been having some problems with crashes on my KVM host (Lubuntu 20.04), and when troubleshooting, I noticed some time-related errors. Upon further investigation, to my horror, I saw that time ...
0
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1answer
803 views

date and time in pods in kubernetes hosted in own datacenter

I am having issue with date and time in kubernetes cluster. My host time is sync using the ntp. Though i have synced it after configuring the cluster. Now all the pods created within my cluster will ...
0
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0answers
97 views

Get PTP4L to fail when it can't connect to an external server

I have a CentOS 7.8 server which has its clock synchronised using the PTP4L PTP service. I'd like the service to fail when it's unable to synchronise with an external server, so I invoke it with --...
2
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1answer
220 views

What time zone does windows event logs show

I have a doubt on the time zone shown in the windows event logs. I had read that if I export the windows event logs from another machine and open it in my machine which has a different time zone, the ...
2
votes
1answer
188 views

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 ...
1
vote
1answer
3k views

How to change time source from a LOCAL CMOS CLOCK to a Cisco router configured as a NTP master

I have a test network that I'm using for my CCNA. I am using my Cisco 2811 router as an NTP master. I think I have it configured correctly. Is there a Cisco command to see what NTP time source I am ...
0
votes
1answer
29 views

How to synchronize the timing of two or more distributed wireless nodes?

What is the best approach(s)/ method(s) to synchronize the timing (clocks) of two or more distributed wireless nodes such that these are coherent with each other and not slipping cycles?
1
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1answer
113 views

NTP time synchronization [closed]

I have two Linux computers connected to each other via Ethernet crossover cable. No Internet Connection! How can I make the first computer always sync to the time of the second computer? I tried ...
0
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0answers
17 views

Centos NTP time skew alerts [duplicate]

I have a couple of NTP Stratum 2 servers, and these are in sync with a Stratum 1 GPS appliance, and also peered between them selves. I would be interested in creating a job, which will create an alert ...
2
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0answers
121 views

What is the packet count in timedatectl timesync-status command

I am trying to understand the output from the timedatectl timesync-status with an example shown below: Server: 91.149.91.123 (ntp.ubuntu.com) Poll interval: 32s (min: 32s; max 34min 8s) Leap:...
1
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0answers
44 views

NTP reach property equivalent for timedatectl command

The ntpq -p command returns information which includes the reach and when properties as shown in the example: remote refid st t when poll reach delay offset jitter ==========...
0
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1answer
258 views

Configure Windows NTP service for Linux clients

I have 100 Linux clients and a Windows Server 2016 in a closed network environment. I would like to have the Ubuntu clients time sync with the Windows Server's date-time. I have done this on internet-...
1
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0answers
96 views

Hyper-V DC VM time keeps reverting after resync

I have a domain controller running Windows Server 2016 in Hyper-V on a Windows Server 2016 Host. My time is off by 9 minutes. I've configured the following command to force custom NTP servers to be ...
-1
votes
1answer
612 views

understanding windows time configuration

I wish to set external time source for all Vms and HyperVs in several domains. Most of the systems are windows Server 2012 R2 or Server 2016. I have been reading a lot of explanations and I somehow ...
0
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2answers
7k views

Domain-joined computer won't switch time source to domain from “Local CMOS Clock”

My situation is almost identical to the one cited in this post: How to change time source from "Local CMOS Clock" to "DC" I have a domain-joined computer that is showing "Local ...
1
vote
1answer
1k views

There's no ntpd in centos 7, how to sync time automatically and manually with chrony?

Seems there's no ntpd in centos7, how can I sync time in centos7? I found out that chrony should be used in centos7, what is manual way to update time using chrony? I assume chronyd is something ...
0
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2answers
1k views

CentOS 7 - how does timedatectl sync time and date without NTP?

I am creating automated tests for an rsync-like utility and I need to be able to set the clock back 24 hours for one of the tests. However, when I use timedatectl to set the time and date they ...
0
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2answers
193 views

What sources does public NTP servers use to ensure time sync?

As from the title, I would like to know what sources “pool.ntp.org” and other big NTP service providers use in order to ensure they are in sync and serving clients the exact date and time.
0
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1answer
26 views

Query Network Client Date

Question: Is there a way to ping or query the date of a client linux computer for the purpose of verifying time synchronization? Setup: I have two computers on a network. One linux machine (machine A)...
0
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1answer
2k views

How do I force a domain controller to sync with the PDC?

DC2 (a VM) is not syncing to DC1 (a physical server). On DC2 I get: PS C:\> w32tm /query /source Local CMOS Clock What must I do so that DC2 syncs to DC1 as its time source? Background: I had ...
2
votes
2answers
697 views

Decentralized NTP in network with only sporadic internet connectivity?

I have a (most of the time) isolated network consisting of several computers. computer 0 -- external NTP server / switch -- computer 1 -- external NTP server \ ...
3
votes
1answer
117 views

Compute Engine VM clock runs fast and gains 15 seconds per hour (or about 1 second per each 4 minutes)

I have a 2 vm instances in GCE that do not keep correct time in spite of the server OS being set to sync with NTP every 24 hours. The OS clock gains about 1 second of time every four minutes (or ...
0
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1answer
310 views

2008r2 clock running fast

I have 27 2008R2 servers (all Hyper-V guests) that recently started running fast. There are other 2008R2 servers on the same hosts that run spot on. The time averages from 2 to 3 minutes fast but at ...
0
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3answers
359 views

Properly setting date on Linux machines

I am trying to set the system date on my linux machine. If it matters, it is an Amazon EC2 machine that I provisioned. I tried to set the date with this command: sudo date -s "19 APR 2018 11:14:00"; ...
8
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3answers
4k views

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 ...
1
vote
1answer
8k views

EventID 1 - An application or system component changed the time

Our VM's are coming up with the following errors in the Event Log - EventID 1 Change Reason: An application or system component changed the time. All the DC's look to be time synced correctly, but ...
4
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0answers
2k views

Why did w32tm /resync cause it to correct itself, then overshoot?

Background: My LAN's Windows Server 2012 R2 Domain Controller had been running without any external time server for a few years and I finally synchronized it now. It had been running about 2 minutes ...
12
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3answers
2k views

How to synchronize time on ESXi Windows virtual machines within one second?

I'm a developer and we are using Quartz.Net, widely used scheduling library with SQL backing store to run cluster of jobs servers (VMs on ESXI cluster). Quartz.Net requires that time will be ...
8
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2answers
917 views

linux system time temporally jumps

I saw a strange system time changing behavior in some (hardware) servers: in /var/logs/syslog, the date time preceding each log message sometimes change to a random one and gets back to normal in the ...
2
votes
4answers
18k views

Domain Controller time won't sync with NTP server

I'm having a problem with a domain controller which won't sync with a time server. I've tried everything I can think of and I've already googled many fixes, but nothing seems to work. This is a ...
1
vote
2answers
1k views

Unable to synchronize date by NTP on Debian 9

Debian 9 as Guest Hyper-V is unable to synchronize the clock and set the right date, always it stays around 6 minutes behind: (Timezone is obfuscated) #  systemctl start ntp #  date sáb jul ...
4
votes
2answers
32k views

change time grayed out in windows server 2016

I have Windows server 2016 joined to domain. I want to put back date in the server. But the option for changing date and time is grayed out. It has a message saying "Some settings are hidden or ...
0
votes
2answers
7k views

How do I tell if chronyd is actually self-synchronising correctly?

I'm working on some devices where I want them to self-synchronise while their network connection is down (i.e. use chrony's calculations of drift rates to compensate for system clock drift), and then ...
3
votes
1answer
227 views

How to prevent relative time shift after restoring a snapshot in Parallels?

I am working with a web-based app on an Ubuntu test/development system running in Parallels. At specific dates and times (taken from the system time) some events happen and things are changed in the ...
2
votes
1answer
921 views

Clock drifts on virtual machine, nothing helps

I have very rapid time drifts on vmware. -241587 20:38 -241587 20:39 -241587 20:40 -241587 20:41 -241587 20:42 -0.014 20:02 -0.025 20:03 -0.056 20:04 -0.093 20:05 -0.093 20:06 -68996. 20:07 -68996. ...
4
votes
2answers
750 views

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 ...
2
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2answers
2k views

Find windows process that is changing time back 1 hour

I have a windows machine which will periodically change the system time, for reasons unknown. It appears to happen every hour. This windows machine is a virtual machine (Parallels Desktop 9, Win7 ...
0
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1answer
3k 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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