Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [ntp]

NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference.

717 questions
2
votes
1 answer

NTP not sync the time continuously, Have to restart the service of NTP then it SYNC in Ubuntu

I am facing one problem. NTP server not sync the time automatically. If I change the the time of system then NTP server not able to correct it. After reboot the service of NTP it sync the time otherwise not. Checked the log also but did not found…
user260278
  • 29
  • 1
  • 2
2
votes
1 answer

udev rule running setserial low_latency don't work

My server runs Ubuntu 14.04.1. I created udev rules in /etc/udev/rules.d/09-pps.rules to get GPS with PPS support work. KERNEL=="ttyS0", SYMLINK+="gps0", MODE="0666" KERNEL=="ttyS0", RUN+="/bin/setserial -q /dev/%k low_latency" KERNEL=="ttyS0",…
wenzul
  • 225
  • 1
  • 4
  • 11
2
votes
1 answer

Windows Server NTP Authenication

I have setup an NTP Server on a Windows Server 2008. The Time synchronization works with Windows Clients and Non Domain Clients but now i have switches that want to authenticate against NTP Server and sending Auth Codes. I haven't configured any NTP…
Sinista
  • 87
  • 1
  • 2
  • 10
2
votes
1 answer

Problems setting NTP sever with w32tm for a DC that is a Hyper-V guest

I have tried to sett my DC to get its time from several NTP severs. I follow this answer (W32Time sync problems for Hyper-V Guests (W32Time Event IDs 38, 24, 29, 35)) to do it. First I disable Time Synchronization in the Hyper-V Integration…
R.Tonheim
2
votes
3 answers

Why doesn't the time match on two Windows Domain Controllers despite resync?

In my domain there are two domain controllers, there is a gap of 3 minutes between their times and than I can find this difference between many clients (it depends on their DC). If I run this command: w32tm /monitor I can see that DCs can see each…
Tobia
  • 1,272
  • 9
  • 41
  • 81
2
votes
2 answers

High Jitter in NTP and poll value never goes above 128

I have a lot of servers syncing to the same NTP servers (4). Not every server is in the same LAN. Some are 3 hops away from the NTP servers and some are 6 hops away. On couple of servers I see that the poll value never touches the 1024 mark and the…
Aseem
  • 79
  • 1
  • 3
  • 14
2
votes
2 answers

Both my ntp servers are marked as falsetickers in the status

I have a linux box, set up with two ntp servers to sync. This box in case, was extremely out of sync (61 seconds) before it was forced sync. The following outputs are 1 hour after this sync. When checking the ntpq, ntpq> peers …
kurast
  • 123
  • 1
  • 1
  • 6
2
votes
1 answer

System clock jumps over 50 seconds randomly

Having a really strange and frustrating issue with system clocks across a few (non virtualized) Ubuntu 12.04 servers. The system clock jumps unpredictably by over 50 seconds. Here's a part of the loopstats file while using ntp: 56771 23997.310…
grepjuice
  • 63
  • 1
  • 1
  • 6
2
votes
0 answers

ntpd -gq do not working on CentOS 6.4

when I'm running 'ntpd -gq' from CentOS 5.10 (i686) the time is synced, but in CentOS 6.4 (x86_64) the command gets stuck (I need to stop it using ctl+c). Any idea hoe to fix it? EDIT: iptables -L -n -v Chain INPUT (policy DROP 260 packets, 51849…
User
  • 21
  • 2
2
votes
0 answers

ntpd default rate limiting?

I've got about 70 linux instances running on an OpenStack cluster that currently consists of two compute nodes and one controller. Also, these machines live in a RackSpace DC as part of their 'Private Cloud' program, so all of our resources are…
Sammitch
  • 2,111
  • 1
  • 21
  • 35
2
votes
2 answers

Why does ntpd need to bind external interfaces to sync the local clock?

I wanted to tighten my security so I don't want to open any ports that are not really needed. I have no intentions of running an ntp server for other people to use, I only run the ntp daemon to keep the local clock synced, so I added these two lines…
Pablo Fernandez
  • 7,438
  • 25
  • 71
  • 83
2
votes
2 answers

How to configure NTP has a TAI or GPS time reference?

For our project, we would like to have all servers and systems synchronised to a linear time reference (without leap second). Therefore, we would discard UTC but are very interested in advertising TAI time (or GPS time). Our time server will be…
Huygens
  • 1,708
  • 3
  • 20
  • 36
2
votes
1 answer

Disable NTP on Juniper SRX-240

I'm trying to shutdown/disable the ntp daemon running on a Juniper SRX-240 (junos 11.4), but the obvious solution is apparently not valid for this hardware/software combination.
Mads Ravn
  • 145
  • 1
  • 5
2
votes
2 answers

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 started happening, or whether it's been this way for…
Betty Crokker
  • 231
  • 1
  • 4
  • 10
2
votes
1 answer

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 different ways to do it, but I'm having trouble to find…
user195176
  • 21
  • 1
  • 2
1 2 3
…
47 48