13
votes
2answers
485 views

What can be done to improve time synchronization on networks with sporadic internet access?

I'm looking for advice setting up time servers for a very non-typical network. I support many closed networks that have occasional access to the internet. A network would get access most days for a ...
1
vote
2answers
406 views

Why does NTP daemon keep listening on UDP6?

I have a clean Debian 7 installation, and I manually entered the following lines in /etc/ntp.conf: interface ignore wildcard interface listen <local_nic_ip> Hoping that NTP will no longer ...
2
votes
1answer
701 views

ntpdate failing “Name or service not known”

I've got a NAS that is Linux-based (Linux version 2.6.32.11-svn70860) and it is not able to set its time using ntp. The previous SysAdmin is long gone so I have no idea whether this problem just ...
1
vote
0answers
384 views

Linux - NTP stopped working after recent update

A few days ago I had ntp setup on my network, and everything was running fine. One node was set to sync with upstream servers, and the rest of the nodes from the one set to sync upstream. Yesterday I ...
10
votes
2answers
172 views

why doesn't ntp recover after an Internet-less startup?

I have a few Linux devices (without TOY chips, so they completely rely on ntp) which may boot without access to Internet (the link to the switch is up). The ntp service will start but obviously no ...
0
votes
1answer
1k views

NTP local query always times out

I have a CentOS 6.4 server, it does not have any iptable rules, it runs NTP daemon as service using the following configuration: driftfile /var/lib/ntp/drift server 0.pool.ntp.org server ...
2
votes
1answer
204 views

Which NTP source should I use in ESXi virtual machines?

I have a ESXi host running ~20 virtual machines (mostly EL6, but also one or two Windows Server 2008 R2). What is the best practice for timekeeping on virtual machines? I'm thinking about 3 ...
0
votes
1answer
162 views

Ubuntu 12.04 LTS regularly loses sync with NTP server

I have a Ubuntu 12.04 LTS VM running inside VirtualBox. It is fine except the clock winds up being exactly 25 minutes behind every other machine on the network. My normal procedure is to setup NTP, ...
2
votes
2answers
390 views

Set up an NTP server to allow local machines to be syncronised for Linux

I am trying to set up a machine to act as an ntp server to which the other local machines will syncronise their times to. This needs to happen regardless of whether the ntp server machine is connected ...
9
votes
2answers
531 views

What is the strategy for detecting time drift in a linux based data centre?

What is the strategy for detecting time drift in all linux based data centre? This is a more difficult problem than it seems at first. Time drift can cause serious problems for certain applications ...
1
vote
2answers
140 views

Clock skew on my VPS server

I am having a problem with the time on my VPS hosted at Rackspace. Its running Red Hat Enterprise Linux 5.4. Date commands gives a time which is 11 minutes ahead of the actual time. I am running ntpd ...
0
votes
2answers
284 views

ntpdate wrong date

Hi all I have an ubuntu8 server where I have problems with date. My current date (Europe/Rome) is 9:35 If I do date print me 11:12:34 I have seen my ntp.conf is: server 0.ubuntu.pool.ntp.org ...
1
vote
1answer
252 views

Real-time clock is wrong (from hours to years), one-time non-monotonic change at boot needed. Can Chrony solve this?

I can't guarantee a sane real-time clock on some machines (the time might be wrong by hours, months or even years). Since I also have intermittent networking, I set up Chrony in the hopes it could fix ...
0
votes
1answer
137 views

Since today morning one of the DC's in my workplace changed it's hour to 2 hours late and I'm unable to find why

The server is getting NTP updates from a Linux server in the environment: C:\Windows\system32>w32tm /config /update The command completed successfully. C:\Windows\system32>w32tm /query /status ...
12
votes
2answers
2k views

Why does ntpd listen on so many ports/addresses?

I’ve noticed this for a while, and it’s never made any sense to me: Why does ntpd need to listen on so many addresses? For example, a Debian machine: $ netstat Proto Local Address Foreign Address ...
3
votes
2answers
160 views

NTP syncs with local timeserver but not NTP pool servers

I setup an NTP server on a machine in another subnet and tried to ync my machine with the server and it works well. But when I try to ust the pool.ntp.org servers (I tried 0.pool.ntp.org, ...
0
votes
1answer
132 views

Why running ntpdate one after one dosnt set offset to 0

I am running ntp update , one after one (with sec between them), In the log i see that there is always an offset , even if update was run few sec ago. Why is that?Is there a chance to get 0 offset? ...
2
votes
1answer
128 views

Time jumps on guest system really shortly

I've got a ESXI-Server and a OpenSuse 10.3 distribution running on it as a guest system. In a java (6_17) application that uses Thread.sleep() to not hog 100% CPU, I noticed that it sometimes never ...
7
votes
3answers
906 views

NTP Server with no connection to the internet

I have a small LAN that has no connection to the internet. It consists of two ubuntu servers clustered together providing NFS services to two IP cameras. I need to synchronize the time on all the ...
2
votes
2answers
310 views

Is there any way to make ntpd to iteratively consult the server addresses given in the ntp.conf file?

Suppose the machine has an ntp.conf file that looks like this: driftfile <path-to-drift-file> server <NTP-server-1> server <NTP-server-2> server <NTP-server-2> For some reason, let ...
2
votes
1answer
646 views

Is my NTP configuration correct?

I have a CentOS virtual machine running remotely, accessible via VPN. It was set up to sync time from two servers on the same network. The time set is approximately right, but seems to be drifting ...
2
votes
2answers
1k views

ntpd on Ubuntu fails to sync with status 2040

My Ubuntu 10.04 server has ntpd running with default configuration. Problem is it doesn't sync. Syslog shows: kernel time sync status 2040 When I try stopping ntpd and running ntpd -q it does ...
2
votes
1answer
263 views

NTP: ntpdate to sync time between the cp's on private network

I have two systems One acts as Primary/Active and has Internet connection and gets time from NTP server. The second system is Secondary/Passive and has no connection to the external world. Primary ...
7
votes
1answer
1k views

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 ...
2
votes
5answers
2k views

Does CentOS 5.4 properly handle leap seconds?

Apparently the IERS have announced a leap second due at midnight, June 30th this year. Is CentOS/RHEL 5.4 properly updated to support/transition along with updated NTP systems? I was under the ...
2
votes
2answers
3k views

NTP not updating the server time in CentOS

I compiled ntp for arm My NTP client is not updating the time from any of the server I referred to the post "Why is ntpd not updating the time on my server? (7)" But nothing works out.. Here is the ...
1
vote
3answers
1k views

Linux Centos 6.2 “hangs” until date is synchronized

I'm having a problem that i cannot understand why or how to solve it. I have a Centos 6.2 server, that's my secondary DNS (bind 8) and DHCP (ISC's dhcp server). I need to maintain an accurate date ...
0
votes
3answers
7k views

How to configure ntpd to sync time more frequently?

I need to set ntpd to sync time as often as possible, how to do that? UPD I need to make ntpd adjust system clock more frequently, not poll servers. It's necessary because system clock of my virtual ...
-1
votes
1answer
190 views

Multiple NTP Server Instances on One Server (Linux)

Is it possible to run multiple NTP server instances on the same system? We're using CentOS for our NTP system and want to synchronize specific time depending on what interface the client comes in on. ...
1
vote
2answers
7k views

NTP configuration not recognized?

I'm trying to configure NTP on my machine but it seems that the parameters I set are not being read by the system. Below is my /etc/ntp.conf file. (I applied the most basic configuration to eliminate ...
2
votes
1answer
4k views

NTP not syncing, only syncs on service restart

My ubuntu 11.10 server has been sitting there quite happily for the last 3 - 4 months, then suddenly the time started going out of sync by one hour. I'm not sure why, nothing has changed re the ...
1
vote
3answers
1k views

sync time on linux using ntp and persist it

on linux to sync time with ntp you say ntpdate pool.ntp.org however after reboots, the time gets reset to some odd value again. is there a way to persist the changes? how do I set the computer ...
2
votes
1answer
229 views

Is it possible to monitor NTP through SNMP in Linux

Is it possible to monitor the NTP drift value ( I mean measuring the time difference between the NTP server and the server that I am trying to monitor) using SNMP.
3
votes
3answers
6k views

How to synchronize time between a Windows client and a Linux NTP server?

I want my Windows 7 machine to get its time from my Linux Debian Sid server. So I want ahead and installed OpenNTPD from the Debian repository. It doesn't listen to anything by default, so I ...
8
votes
3answers
235 views

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. ...
1
vote
4answers
506 views

Getting time to sync with NTP on Centos 5 VM

My Centos 5 VM is drifting time. I have scoured different answers to solve this problem. I've looked at the VMWare's tips and added tinker panic 0 on top of my ntp.conf file. I also changed the ...
4
votes
4answers
8k views

ntpdate -d Server dropped Strata too high

I cannot sync with a NTP source thats coming from an internal router/firewall. Anyone help ? ntppdate -d 192.168.92.82 6 Jun 11:57:30 ntpdate[5011]: ntpdate 4.1.2@1.892 Tue Feb 24 06:32:26 EST ...
0
votes
2answers
2k views

configure Centos with NTP

I would like to configure my servers to use NTP. I would like them all to use GMT time zone. I would like to use public NTP server how do I do it?
2
votes
2answers
253 views

ntpd Stratum Zero when nptd is started

I have noticed that when I start ntpd on a server, checks against that server reveal that it has a stratum of zero. If I understand this correctly, I believe this means that ntpd is currently only ...
1
vote
2answers
3k views

System clock drifting out of sync with hwclock and ntpd

My current system drifts from the hwclock and ntpd dramatically. I've looked at many forums and posts online and on SF, but haven't found a suitable solution. Here is my ntpq -pn output: remote ...
0
votes
1answer
200 views

NTP Meinberg GPS167: How to connect to a Ethernet?

I have a Meinberg GPS167 NTP: http://www.meinberg.de/english/products/gps167.htm Although it doesnt have a ethernet RJ45 port. Is there any way to connect it to a LAN?
1
vote
1answer
163 views

Setting up NTP on 2 Linux boxes and one OpenBSD box

I have been tasked with getting an NTP client working on two Linux machines and an OpenBSD machine. The machines are arranged like this: NTPServer / \ / \ L1 L2 ...
4
votes
3answers
742 views

Using NTP to sync a group of linux servers to a common time source

I have 20 or so linux servers and I want to sync all of their clocks to a single NTP server, which is in the same rack and switch as my servers. Nothing is virtualized. Our admins are having trouble ...
1
vote
2answers
3k views

Does NTP daemon set the host timezone?

If I am using NTP daemon or ntpdate command, do I need to worry about changing the timezone? Should I re-configure the timezone using cron job to guarantee the accuracy of the server time? I am ...
4
votes
3answers
1k views

Seemingly poor quality of NTP time synchronization using a GPS clock

I have a Linux server which has its time synchronized to a GPS-based NTP appliance located close by. Ping times from the server to the appliance are circa 1ms, with very low jitter: --- x.x.x.x ping ...
0
votes
3answers
89 views

Server Time Jumped Ahead 7 Months

CentOS 5.x My CentOS server appears to have jumped ahead 7 months. I'm not sure how or why. Are there any logs in CentOS that could provide more insight here? Unfortunately, ntpd was not running. ...
1
vote
4answers
149 views

One Linux server has two timer

The time on one of our Linux box is very weird. Whenever I call date 3 times, the 4th call will give a wrong time(usually 1 hour later). I have setup cron to sync with ntp server. We have 20+ similar ...
1
vote
2answers
3k views

Hosting an NTP server on a standalone network

I have a LAN that is not connected to the internet, and I am trying to sychronize all the machines, Windows and Linux, to an NTP server. All I've been able to find is setting up an NTP client with an ...
0
votes
2answers
342 views

My linux server time and log files are not the same

Hi i have installed NTP on my linux server and i am getting my clock from a 6500 core switch, everything is working fine. When i ssh to a switch i have it all sent to a log file on the linux server, ...
2
votes
5answers
2k views

NTP failing to update

I am attempting to use ntp on the server. Checking ps the ntpd process seems to be running: ntpd -u ntp:ntp -p /var/run/ntpd.pid -g However the time is not being corrected, any ideas? The drift ...