The Network Time Protocol, is used to synchronize system clocks to precision time servers on the internet or locally connected devices such as a GPS.

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IPTables allow NTP Time Server

I am new to IPTables. I have an existing config that seems to work well. I am not sure I know how to add NTP to the rule Chain RH-Firewall-1-INPUT correctly. My goal is to add an additional rule to ...
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1answer
24 views

How to know my server's time offset? [duplicate]

I have a few guest machines on VMware. Up until now I was keeping my time sync with ntpd inside guests. Now our VMware admins decided to setup VM hosts to keep time, so VMs don't have to. I disabled ...
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1answer
57 views

Why is ntpd listening on most of 192.168.1.X/192.168.2.X

I'm using the ntp package in debian squeeze and the ntpd process is listening on hundreds of rfc1918 addresses that are not configured on the server. Check this out: Mar 26 10:07:24 server ...
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2answers
66 views

Strip specific option from a response in dhclient

I aim to prohibit dhclient from updating my NTP config with servers received via DHCP, as it is the default on Debian/Ubuntu. However, my DHCP server ignores the list of requested options (from the ...
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3answers
144 views

timed out, nothing received

I tried all and googled a lot! But I can't make work NTP on my server. This post is last hope! I have installed ntp on debian server with this configuration (/etc/ntp.conf): driftfile ...
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1answer
82 views

Why am I getting apparmor error messages in the syslog about NTP and LDAP?

On my newly installed Ubuntu 12.04 machine, with ntp and slapd installed, the following messages appear in /var/log/syslog at regular intervals: Feb 23 18:54:07 my-host kernel: [ 24.610703] ...
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1answer
100 views

Why doesn't NTP increase polling interval when using a GPS/PPS receiver and internet servers?

I have a Debian system that is used as an NTP server. It queries several servers on the internet and also has a GPS receiver with PPS output for precision timekeeping. If I don't use the GPS ...
4
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1answer
280 views

Arch ntpd/ntpdate not synchronizng clock

My raspi running Arch isnt updating time with NTPD. Im running [root@fatpi ~]# cat /proc/version Linux version 3.10.28-1-ARCH (nobody@root-armv6-copy) (gcc version 4.8.2 20131219 (prerelease) ...
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2answers
81 views

Setup ntp client with embedded device

I need to run an NTP client on a very limited embedded device. ntpd is available but I do not see anything like rc.conf, or ntp.conf, or xntp.conf? Can someone advise on how to setup NTP? I ran ...
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NTP Problems - sntp: too many bad or lost packets

I need some help from you guys regarding NTP on Suse. I have a server, whose IP is 192.168.100.52, which is based on Suse Linux and here is my NTP conf file: server 192.168.100.11 iburst restrict ...
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1answer
109 views

last reboot/uptime/… strange behaviour

I know this has been more or less asked before but I still don't have any answer. I started to investigate why on my system (it is a remote machine) who -b and uptime gave different results (~3 days ...
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1answer
135 views

Does ntpd default allow query requests through?

I am confused as to what is the default access policy of an ntp server. According to the ntp_acc man page, access can only be denied if specifically blacklisted. Clients can be denied service ...
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1answer
169 views

NTP is synced properly but still doesn't update the time?

I wanted to test if ntp was working on my machine, so I set the time back 5 minutes and restarted ntp $ sudo service ntp stop $ sudo date -s "9:40 AM" # This time was 5 minutes ago $ sudo service ntp ...
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440 views

What is the recommended way to synchronize time using NTP?

This question has come up a number of times in a localized way, this question is meant to provide the preferred/best method for synchronizing a system's clock using NTP. The solution should handle ...
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101 views

How can I make a Puppet module that fixes time? [duplicate]

I have written a Puppet module that corrects the time via NTP, but this only works on server with a small NTP offset. There are sometimes server with a time offset higher than 10 minutes for various ...
4
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2answers
125 views

ntpd takes 9 hours to sync

I had a situation lately with a host that need up to date ntp servers. We had during the weekend a crash of our internet router. When everything came back to hte normal our application was still ...
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1answer
468 views

enable/disable NTP service on Ubuntu 12.04

Our application runs on Ubuntu 12.04 precise. On this server, we have both ntpdate and ntp. How to enable and disable ntp service on-demand? I tried sudo update-rc.d -f ntp remove/default and ...
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200 views

Allowing a domain name in my IP Tables

I have a Linux server that gets a time offset for some strange reason. I set up cron job to run and update the time using the following command: /usr/sbin/ntpdate pool.ntp.org The problem is the ...
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1answer
222 views

Finding log file of ntp daemon in Ubuntu 10.04 LTS

My Ubuntu is set to run ntp before dovecot at startup. (See my earlier question: The rc0.d,rc1.d,... directories in /etc in Ubuntu 10.04 LTS) However, I suspect that dovecot may have finished ...
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1answer
110 views

NTP synchroinzation waiting for a while after booting

According to the recommendation on Arch Wiki, I set my hardware clock to UTC. And here is the result of timedatectl status on my machine when just booted: Local time: Tue 2013-07-02 15:38:03 ...
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1answer
1k views

Daylight saving option on Linux servers

My CentOS server is not updating showing correct time. I have set $ ln -sf /usr/share/zoneinfo/Europe/London /etc/localtime Still I am on GMT. I do see the following entries in ...
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1answer
672 views

NTP not syncing in a VM

I'm managing some VirtualBox developer environments. The time drifts out of sync when the box is suspended, so I want to use NTP to keep it in sync. NTP doesn't seem to be doing its job, though - the ...
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1answer
103 views

NTP symmetric mode

I'm configuring NTP symmetric modes. Say I have Peer A (192.168.101.1) and Peer B(192.168.101.2) and configure their ntp.conf as follows: # Peer A peer 192.168.101.2 server 127.127.1.0 fudge ...
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2answers
349 views

Time synchronization of machines on LAN to GPS NTP server on the LAN

I have 4 computers on a LAN that need to have their system clocks closely synchronized within a ms or so if possible. I have just installed a GPS based time server (ESE-104A) on the LAN. At this ...
3
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1answer
590 views

Error when running ntpd on openVZ host: cap_set_proc() failed to drop root privileges:

CentOS 6.x | OpenVZ I want to run a NTP server on a vps host of mine. Is this possible? When I try to start ntpd, it fails immediately and gives the following error: Mar 14 22:47:44 ev1 ...
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1k views

How to set tz and date without restart in Debian Squeeze?

I've tried tzselect and all it appears to do is tell me what region I want to pick. I'm trying to change tz without a restart and for all users, then sync the time accordingly.
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576 views

How to send ntp request?

I would like to get local time of server. Is there command/way to get time of server. Operating system is solaris
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2k views

What are possible reasons for erratic NTP synchronistation?

On a Ubuntu 10.04 system I noticed following strange NTP sync events: Jul 3 02:19:51 hst ntpd[1432]: no servers reachable Jul 3 02:36:55 hst ntpd[1432]: synchronized to 91.189.94.4, stratum 2 Jul ...
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1answer
797 views

NTPDate runs three times at boot resulting in incorrect date

I am running Voyage Linux (a Debian-based distribution) and am having trouble getting the correct date. When I look in /var/log/daemon.log I see the following: Nov 18 11:04:07 voyage ntpdate[1676]: ...
5
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2answers
162 views

NTP tool for showing deviance to a certain server

I am searching for a command-line that allows me to check the system time deviance to a NTP server specified on the command-line. I don't want to change/adapt the system time - only displays the ...