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Questions tagged [time]

Time is a dimension in which events can be ordered from the past through the present into the future, and also the measure of durations of events and the intervals between them.

Time is a dimension in which events can be ordered from the past through the present into the future, and also the measure of durations of events and the intervals between them.

It has been said that time is used by the universe to ensure that everything doesn't happen all at once.

It has also been said that: "Time is an illusion, lunchtime doubly so." Not everyone agrees on the nature of time, and time is not fully understood even today.

Because human time perception can be wildly inaccurate, and many system services rely on the close synchronization of clocks, we have specialized clocks do the measurement of time for us. On the Internet, data from these clocks is made available via .

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Local or public NTP servers?

For a relatively large network (thousands of hosts) - what are the arguments for and against running a locally managed (pool of) NTP server(s) (perhaps periodically set via some public NTP server) and having all other hosts on the network use that…
BeeOnRope
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Replacing sick NTP server source and re-synching (with internal time currently 2 minutes late)

One of the external NTP servers (the primary one--currently) we're using as source seems to not be responding to NTP calls. Unfortunately, on our core router (Cisco 6509), the NTP functionality hasn't switched to the secondary NTP external server…
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server restart after timezone change

Is it required that the server should be rebooted once I change the time? I ran into trouble when I changed the datetime and did not restart crond. Is there any other service that may have issues after time change?
shantanuo
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Local timezones on servers considered harmful?

I'm curious as to what other administrators' experiences with timezones, in the context of remotely administered servers, are. In my career I've come across several conventions; Always, always, always use UTC. Always, always, always use the…
colmmacc
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What sort of time management system do you use?

System and network administrators are usually very busy people. Juggling projects, meetings, support tickets, and verbal requests from people in the hallways can make a real mess. We've discussed some request tracking systems here in the past, but…
Justin Scott
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Setting time zone on linux (ubuntu)

Here in the UK we are UTC+1. I set the time using 'date'. However it keeps resetting back to standard UTC, I'm guessing via a NTP time server. I've tried setting the timezone with tzselect but it does not change the time, it remains at UTC instead…
Kris
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How to keep the time on multiple servers in sync

I want a cluster of servers to have the exact same time. All are using UTC time zone. Using NTP currently, i still see they seem to be off by 10-20 miliseconds each. Whats the best way to have them each the exact time?
pdeva
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Single NTP server on isolate network

I have two linux machines (A and B) on an isolated network. They must be time-synchronized. Machine A is powered intermittently and must serve the time, as it is connected to an authoritative time source (GPS). Machine B is only powered if machine A…
San Jacinto
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How to temporarily stop time syncing with domain controller?

I wish to do some testing on my local machine which requires me to put the date forward a year. So I can test some stuff in SQL Server (i've found it not possible to override the sql server time). However because I'm connected to a domain, I believe…
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Managing multi-timezone servers

What would be an ideal time and timezone setup for multi-country servers? Especially considering one central IT team managing these servers. Currently we have each server using a local timezone. e.g. servers in the Chinese datacenter are set with…
Alex
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Domain Controller time is incorrect

I have a domain controller running in VM on Hyper-V, the time seems to be steadily getting faster, over the X-mas period it's 5 faster, which seems odd! I know how to change the time and I belive we setup an NTP server on the DC and ensured…
stead1984
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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 next message, like the following: Feb 22 2018…
Zhaohui Yang
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Changing time or offsetting it in OpenVZ contained server

I am trying to run a VPS, a Debian box contained in an OpenVZ container. Obviously, I cannot use time --set or any such command, as the time must be set via the parent node. The owner of the parent node, however refuses to adjust the time (which is…
Milad Naseri
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What consequences / implications can arise from a wrong system clock?

What issues can you think of that may arise from a wrong system clock setting ? Primarily interested in potential problems affecting servers and Linux or UNIX-like systems in particular. And how severe are these consequences, depending on how much…
Arc
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Redirecting time.windows.com to internal server

In a corporate environment most machines will be domain joined and therefore get their time from the DCs. However, sometimes you get a machine that isn't in the domain. By default these machines will use time.windows.com as their time source. Does…
WaldenL
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