Displaying 20 results from an estimated 10000 matches similar to: "dovecot and ntp: Fatal: Time just moved backwards"
2017 Feb 05
2
Chrony vd NTP
On 05/02/17 16:15, Richard wrote:
>
>> Date: Sunday, February 05, 2017 10:26:05 -0500
>> From: Robert Moskowitz <rgm at htt-consult.com>
>>
>> I have read:
>> http://thegeekdiary.com/centos-rhel-7-chrony-vs-ntp-differences-bet
>> ween-ntpd-and-chronyd/
>>
>> My server is up all the time and will serve time to internal
>> systems (via
2017 Feb 05
2
Chrony vd NTP
I have read:
http://thegeekdiary.com/centos-rhel-7-chrony-vs-ntp-differences-between-ntpd-and-chronyd/
My server is up all the time and will serve time to internal systems
(via DHCP options).
Caveat is that my server is an armv7 (Cubieboard2) which does not have
an RTC (no battery). So whenever the system boots, the time is ZERO
(Dec 31, 1969 or some such).
Chrony fixes this really fast;
2017 Feb 05
1
Chrony vd NTP
> Date: Sunday, February 05, 2017 10:26:05 -0500
> From: Robert Moskowitz <rgm at htt-consult.com>
>
> I have read:
> http://thegeekdiary.com/centos-rhel-7-chrony-vs-ntp-differences-bet
> ween-ntpd-and-chronyd/
>
> My server is up all the time and will serve time to internal
> systems (via DHCP options).
>
> Caveat is that my server is an armv7
2006 Oct 11
9
time synchronization problem (using NTP)
Hi,
using SLES10 I''m unable to synchronize the time of DomU with that of Dom0. There
is a persistent offset of about 3 seconds!
Here''s a small history (not actual output):
remote refid st t when poll reach delay offset jitter
rkdvmso1.dvm.kl 192.168.0.11 5 u - 64 1 0.136 -2977.1 0.099
*rkdvmso1.dvm.kl 192.168.0.11 5 u 2 64
2016 Jan 27
4
NTP Service Running on Local Host does not Sync System Time
Hi List
I have ntp running as a service on a PC, with the expectation that it
would keep time in synch to my ntp server.
However, while I can manually update the time using "ntpdate -u ...",
I find that if I manually force the wrong time, the ntpd service does
not automatically re-synch the system time with the ntp server:
- Current time:
[admin at lol ~]# date
Wed Jan 27 10:54:21
2008 Jan 19
5
Time just moved backwards error even with ntpd
Scenario: server PC abruptly switched off due to power cable problems
(an UPS cannot solve this issue), so during shutdown Linux was not
able to resinchronize the system clock. After a few hours the server
come back on, Linux booted and the services (ntpd, dovecot and many
others) started
But the system clock was 45 minutes ahead, so:
Jan 19 11:13:39 gw ntpd[2112]: synchronized to LOCAL(0),
2007 May 02
5
Return error instead of dying on time back skip?
Hello everybody!
Currently, dovecot just kills itself if it detects that time has moved
backwards more than a hardcoded number of seconds. I accept the
reasons, but I do not like to restart dovecot manually after waiting
for time to move forward again. A cron job would not help, because
time might still be wrong when it restarts dovecot.
All our systems run ntpd, but they might be offline
2015 Sep 23
2
Re: Time syncing after VM suspend/resume
Hi.
Thanks for answering.
Le 2015-09-23 17:34, Dominique Ramaekers a écrit :
> Linux has two methods to use ntp:
>
> ntpdate:
> It will run once at boot time to sync time. (This is probably
> installed on your system)
> It will not run after suspend and resume... => no correction
Nope. This is not installed on my system.
> ntpd:
> Continuously adjusts time. The
2009 Jan 15
5
How to get djbdns to start early enough to satisfy ntpd at boot?
Hi there,
I've been a happy djbdns+tinydns user for many, many years. I
want to keep using it, so answers of the form "bletch! Use ISC
BIND the way BSD intended" will be ignored :-)
Having said that, one annoying consequence of my transition
some time ago to using ntpd, rather than just setting the clock
once-off with ntpdate as I used to, is that the /etc/rc.d
mechanism starts
2019 Nov 17
2
Post-installation setup script for CentOS 7 servers
Le 17/11/2019 ? 14:15, Jonathan Billings a ?crit?:
> I?m curious why you list these as ?cruft? packages?
>
> chrony
> firewalld
> iperf
> NetworkManager-libnm
* chrony: I'm using ntpd and ntpdate
* firewalld: https://github.com/kikinovak/firewall
* iperf: replaced by iperf3
* NetworkManager: great on laptops, useless on servers
>
> Also, I?m sure it?s helpful for
2016 Dec 30
1
chronyd configuration as a local ntp server
Robert,
If your NTP server will be on 7/24, I would uninstall chrony and install
ntpd which is still included in CentOS 7. Configure as usual.
For the differences between chrony and ntpd reference:
http://thegeekdiary.com/centos-rhel-7-chrony-vs-ntp-differences-between-ntpd-and-chronyd/
Essentially, chrony is more for laptops with intermittant network
connections, and ntpd is better suited to
2006 Oct 11
3
NTP and hardware clock
Hi,
I had the following problem today. Because of a misconfigured
network switch one system suddenly didn't have any network.
After a reboot (with the network still unavailable) NTPD refused to start.
Most likely because the initial ntpdate failed to work. I find this
troubling, because when the network was restored, NTPD could have resumed
working (like I'd expect from a true
2011 May 08
6
ntp revisited (so what to do ?)
OK,
So what you people say is :
1. Run "ntpdate" during startup only once
2. After that, keep time with ntpd
Right ?
Regards,
spyros
----
"I merely function as a channel that filters
music through the chaos of noise"
- Vangelis
2014 Dec 12
5
HOWTO Stratum 1 NTP server under CentOS 7
Alexander,
First off, CentOS7 came with cronyd. Which was very annoying
because when I tried to remove it, it had 2 prereqs:
anaconda
initial-setup
Now, I don't know why the setup program kept these
2 around. I think CentOS7 needs a bit growing up.
Anyway, I disabled chrony:
systemctl disable time-sync
systemctl stop time-sync
Then I installed ntp. However, when I started it
it seems that
2016 Dec 27
2
chronyd configuration as a local ntp server
This is for centos 7 that has chronyd 2.1.1
I am looking into how to use chronyd as my local ntp server.
On my old servers with ntpd I had local access control lines like:
restrict 192.168.128.0 mask 255.255.255.0 nomodify notrap
But in looking for documentation on chronyd I did not find anything on
this at:
https://chrony.tuxfamily.org/doc/2.1/manual.html
In the actual /etc/chronyd.conf
2012 May 28
4
NTP and virtual guests
We encountered a problem with respect to KVM virtual host restore and
NTP. Specifically, our VM test host was shutdown by an extended power
outage and when power returned all of the restored guests were
immediately shutdown by ntp because the time differential between the
restored systems and that of the ntpd sync servers exceeded the panic
threshold.
This is not an acceptable situation so in the
2016 Dec 27
2
chronyd configuration as a local ntp server
AFAIK the only thing needed to make your host an NTP server using chrony
is to set the allow line to the network address in CIDR format of the
network you want to be served, and uncomment it. The restart chronyd.
You also need to ensure that port 123 (NTP) is open to your internal
network on your filrewall.
I have a CentOS 6 box that is an NTP server for my network. CentOS 7
works the same
2006 Apr 07
3
ntp server
I thought I'd play with making my system an ntp server.
I did the "service ntpd start" it started OK.
on my laptop I did "ntpdate IP" and it says no server for sync found.
My firewall has open ntp:udp
What did I miss?
Thanks,
Jerry
2019 May 27
9
Question about ntp
Hallo,
what is the standard way to sync time under Centos 7.
ntp or chrony.
Thanks for a short hint.
Ralf
2008 May 21
3
VMware and Time moved backwards
Hi,
I followed the discussions regarding the "time moved backward" problem
and the use of ntp in such cases. At our department we are running two
dovecot servers within an vmware server environment, and unfortunately
the timedrift (with ntpd active) exceeds sometimes up to 30 minutes
virtual drift within 10 minutes realtime (mostly into future). This is
due to some overcorrections