Questions tagged [time-synchronization]

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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 ...
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11 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 --...
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1answer
59 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 ...
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1answer
38 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 ...
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1answer
144 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 ...
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1answer
28 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?
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1answer
105 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 ...
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16 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 ...
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45 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:...
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30 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 ==========...
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1answer
95 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-...
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152 views

Kerio Control Time synchronization fails

I'm trying to put my Domain Controller as NTP Server in Kerio Control setting. but I keep getting the Error:"Time synchronization failed" in the Kerio Control log. I tried other online NTP servers ...
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59 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 ...
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1answer
239 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 ...
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2answers
2k 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 ...
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1answer
619 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 ...
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2answers
604 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 ...
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2answers
166 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.
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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)...
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1k 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 ...
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2answers
469 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 \ ...
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1answer
84 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 ...
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1answer
243 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 ...
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3answers
246 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"; ...
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3answers
2k 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 ...
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1answer
5k 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 ...
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1k 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 ...
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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 ...
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2answers
467 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 ...
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3answers
11k 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 ...
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2answers
960 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 ...
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2answers
20k 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 ...
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2answers
5k 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 ...
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1answer
119 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 ...
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1answer
711 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. ...
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2answers
609 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 ...
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2answers
1k 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 ...
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1answer
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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1answer
551 views

Does systemd-timesyncd need to listen to random UDP ports to work properly?

On Debian Jessie servers I see systemd-timesyncd listening on random UDP ports. Which is not the case on Debian Stretch hosts. By random I mean the port it listens to varies from server to server. ...
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2answers
569 views

Why is my internal clock always 1.3 seconds off?

I ran w32tm /stripchart /computer:time.windows.com just for fun and found out that my clock is 1.3 seconds behind this timeserver. Not that I think Microsoft is wrong, but I tried it with various ...
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2answers
538 views

System time is off by up to hundreds of milliseconds despite NTP sync before boot

I'm running a couple of servers which need a pretty tight time sync (<50ms) as they are running a Paxos algorithm. The servers are running NTP and are successfully sync at one point. According to ...
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3answers
340 views

How to properly sync time for 3 Hyper-V machines, with Host NOT on domain of the VMs?

I understand that for production use, if you have a Hyper-V Domain Controller VM, and the host is on the domain as well, you should have the DC VM reach out to an external source for date/time, and ...
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1answer
333 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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2answers
724 views

Chef-Server 12 Getting me errors when the node is not time synced

I'm getting this error when the clock on my node is different than 15 minutes from my chef server. Authentication Error: Failed to authenticate to the chef server (http 401). enter code here`...
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2answers
456 views

Keeping server time in sync using ntpd

I understand ntpd has a -g option to allow a one time immediate clock set for large skews. Then the daemon runs and continuously adjusts. In the event of the skew becoming too large, the daemon exits ...
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0answers
609 views

How to configure ntp server and chrony client for time sync over link-local IPv6

I have two computers connected with an Ethernet cable. The first computer, let's call it the "master" is also connected to the Internet via a wireless network. It's running ntp and getting its time ...
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3answers
1k views

How accurately are aws clocks synchronized between different aws regions?

According to the wikipedia NTP article, NTP is accurate within 10ms over public internet. I would like to maintain accuracy of logs/events across different AWS regions and my question is how ...
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1answer
3k views

no internet time tab on domain controller, Windows Server 2016

I got an ActiveDirectory with one domain controller that run on Windows Server 2016. I set everything up and most of the things run perfectly so far. But now and then when we have to take it offline, ...
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62 views

How to read VMware interrupt backlog?

The VMware document titled "Timekeeping in VMware Virtual Machines" have the following referente to the issues with the time drift: If the virtual machine is running too slowly, perhaps as a result ...
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1answer
3k views

NTP is running, Clock not synced. Manual DOES work

An ubuntu server is running ntp, and connected to the internet. Still, the system clock is about 30 minutes wrong and gets bigger over time. $ service ntp status NTP server is running.. Output of ...

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