Questions tagged [clock-synchronization]

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NTP 'reach' resetting, wrong refid of remote ntp server, and high jitter

I've got a remote unmanned server that's been exhibiting some extremely strange clock/NTP behavior lately. Symptoms: Very high jitter ntpq -pn returns: A resetting 'when' count of back to 1, even ...
EnemyBagJones's user avatar
3 votes
2 answers
2k views

RTC time is going totally wrong after a few minutes (Ubuntu 16.04 + Hyper-V)

My RTC time on my Ubuntu 16.04 is going crazy. After a few minutes the RTC time is going totaly wrong. The strange thing is, if I disable NTP Service (timedatectl set-ntp false and service ntp stop) ...
Jerico's user avatar
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2 votes
0 answers
924 views

Chrony reporting system time slower than NTP and growing

I have chrony running on several of my instances. Unfortuantely, on one of them, it keeps reporting that the system time is slower than NTP time. This number of seconds keeps growing at a rate of ...
checklist's user avatar
  • 121
2 votes
0 answers
2k views

How to configure hwclock to UTC on Redhat Linux?

I have linux redhat machine # more /etc/redhat-release Red Hat Enterprise Linux Server release 5.11 (Tikanga) I want to change the hwclock to UTC time So I perform little test as # date -u Tue ...
dandan's user avatar
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2 votes
0 answers
730 views

Hardware Clock (RTC) Stuck / Will Not Increment

After we rebooted one of our servers (RHEL), we noticed that it would hang when entering GRUB. The problem was the countdown in GRUB (Booting in 5... 4......) was not counting down, and was stuck at ...
Tanaki's user avatar
  • 131
1 vote
1 answer
975 views

Prevent VM clock running faster than it should

I have a unRAID 6.6.5 server with perfectly correct time and multiple Linux VMs which used to be perfectly synced too. I rebooted one of my VM and suddenly the clock goes twice as fast as the hwclock. ...
dan's user avatar
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1 vote
0 answers
459 views

Preventing system clock from auto-updating in Windows Server 2012

I'm working on a project right now where as part of testing I have to move the system clock to far-off future dates. There are two servers involved in the project: an app server and a database server. ...
John Clifford's user avatar
1 vote
0 answers
231 views

RTC/UTC was innacurate on MySQL (MariaDB) server. I fixed it - was that bad?

I'm pinch hitting as an admittedly green server admin. I installed a bunch of security patches on a MariaDB server that had an incorrectly configured repo (not by me) and wasn't getting patches for a ...
bendodge's user avatar
  • 166
1 vote
0 answers
1k views

Update clock on virtualbox virtual machine with cent os from host

I have a virtual machine, with cent os installed, and everytime I sleep the host computer, the clock of the VM goes out of sync. I would like it to pick up the current time from virtualbox - which I ...
Billy Moon's user avatar
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Windows server time going back to past due to time synchronization with the hardware clock

For two months we are facing issue on our Windows Server 2016 server every 10 days. Server time is going back by one hour with the below message in event log. The system time has changed to ‎2023‎-‎12‎...
Sowjanya Ravi's user avatar
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1 answer
1k views

Cannot change NTP Time Source on a 2012 R2 DC Server

So I have seen dozens of people with this issue on various websites and forums, but here I am asking again. No matter what I try so far, nothing has fixed the issue which I will describe below in as ...
ksrobinson's user avatar
0 votes
1 answer
178 views

ntpdate succeeds but ntpq fails against Windows DC

DC: Server 2019 Client: TrueNAS https://docs.microsoft.com/en-US/troubleshoot/windows-server/identity/configure-authoritative-time-server for step 3, the DC is configured to be an NTP server and is ...
Tyler Montney's user avatar
0 votes
1 answer
913 views

/sbin/hwclock --utc --systohc not working on AWS EC2 under Ubuntu

I'm in the process of moving some servers to AWS. One problem I'm encountering is that my script to synchronize the time using ntpdate and then write that time to the hwclock is failing. When the ...
Stephen Ostermiller's user avatar
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145 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 ...
rfmoz's user avatar
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When to change current_clocksource

I am running an Ubuntu 16.04 machine on a M4.xlarge in AWS EC2. I was reading about some of the performance tuning that Netflix did for their EC2 machines (link: http://www.brendangregg.com/blog/2015-...
jamesatha's user avatar
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