Questions tagged [chrony]

a pair of programs which are used to maintain the accuracy of the system clock on a computer.

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Can I use both pool and server configurations in ntp?

For a ntp demon, what happens if I have this configuation in ntp.conf: pool 0.pool.ntp.org burst iburst minpoll 4 server europe.pool.ntp.org ? How will ntp be configured? I don't know there to be ...
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How can I sync external servers to point to an AWS ec2 server running aws time sync chrony

I have setup an EC2 to use the time sync and want to use it as an 'NTP' server. I have setup the security group to allow all traffic in on 80,443, and 123 for now to test the configuration. It's in a ...
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1answer
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Chrony “root dispersion” keeps rising steadly over time, despite accurate time sync

I have a Debian 10 system that uses chronyd to keep its clock in sync. The config is pretty simple: pool 2.debian.pool.ntp.org offline iburst bindaddress ::1 bindaddress 127.0.0.1 bindcmdaddress 127....
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32 views

Can a CentOS 8 chrony client synchronize with a CentOS 7 ntp server?

Can a CentOS 8 chrony client synchronize with a CentOS 7 ntp server? By ntp server, I mean it was configured through yum installing the ntp package and not the chrony package.
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chronyd on debian could not open IPv6 NTP socket

$ sudo journalctl -fu chrony -- Logs begin at Thu 2019-11-14 03:51:16 UTC. -- Nov 22 01:46:40 miranda-ntp-server-01 chronyd[5984]: Selected source 169.254.169.123 Nov 22 02:29:29 miranda-ntp-server-01 ...
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0answers
193 views

gpsd.socket for chrony does not work

I tried to get more accurate time from gps data using ublox module and centos but it seems gpsd.sock does not work properly to get the data to chrony. am I missing somthing ? [root@info /]# cat /etc/...
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1answer
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how configure chrony in orphan mode

I have two centos servers without internet i tried to enable orphan mode so they synch with each other but still time is not synchronized between them. Find below my settings and output of commands /...
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1answer
335 views

Why is the /var/log/chrony folder empty?

we are using chrony in order to sync our servers to ntp servers ( redhat 7.2 ) we configured the logdir /var/log/chrony in chrony.conf and restart the chrony ( systemctl restart chronyd ) , but ...
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Machines experience time offset despite chronyd service running

we have 3 machines in the cluster ( redhat 7.2 ) linux_machine1 linux_machine2 linux_machine3 the machines time are like this Sun Sep 1 13:54:20 UTC 2019 - linux_machine1 Sun Sep 1 13:34:15 UTC ...
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1answer
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Problems with chronyd Centos 7 all updates applied

I have an email server running on top of CentOS7. This is a new server and has been in production for 2 days. It seems that chronyd is losing it's connection to the ntp servers that it contacts at ...
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1answer
101 views

Linux centos 7.6 chronyc synchronizing

I have a server where a lot of time chronyd isn't able to sync the system clock leading at a situation like that : Reference ID : 0A263C14 (10.38.60.20) Stratum : 4 Ref time (UTC) : Tue ...
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2answers
1k views

chrony does not log anything on my ec2 instance

i am trying to gather statistics from the chrony daemon on my EC 2 (Ubuntu 18.04.2 LTS) instance. i have followed aws's guide on how to set it up and it runs as expected. i need to compare the time ...
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1answer
26 views

Query Network Client Date

Question: Is there a way to ping or query the date of a client linux computer for the purpose of verifying time synchronization? Setup: I have two computers on a network. One linux machine (machine A)...
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2answers
1k views

Verify internal NTP server is sending the correct time?

I have two NTP stratum 3 servers running and wanted to create a simple check that I could tell if either of the servers time drifted and alert that it's not synced properly with the public stratum 2 ...
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2answers
487 views

Decentralized NTP in network with only sporadic internet connectivity?

I have a (most of the time) isolated network consisting of several computers. computer 0 -- external NTP server / switch -- computer 1 -- external NTP server \ ...
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1answer
18k views

Force chrony time check

Context: Centos 7.0 chronyc (chrony) version 3.1 (+READLINE +IPV6 +DEBUG) Issue I want to find a way to force chronyd to change the hardware clock instantly without waiting. The program chronyd is ...
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2answers
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How do I tell if chronyd is actually self-synchronising correctly?

I'm working on some devices where I want them to self-synchronise while their network connection is down (i.e. use chrony's calculations of drift rates to compensate for system clock drift), and then ...
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1answer
179 views

How Does Chronyd Slow Down/Speed up Clock?

I am reading this: https://chrony.tuxfamily.org/manual.html#makestep-command It mentions, "Normally chronyd will cause the system to gradually correct any time offset, by slowing down or speeding up ...
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58 views

Synch Clock Per Request

I am using CentOS 7.4, and NTP is replaced by Chrony. I just wonder whether Chrony has something similar to ntpdate, which can be used to synch clock per request (from command line, etc)? Thanks in ...
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0answers
603 views

Chrony reporting system time slower than NTP and growing

I have chrony running on several of my instances. Unfortuantely, on one of them, it keeps reporting that the system time is slower than NTP time. This number of seconds keeps growing at a rate of ...
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0answers
621 views

How to configure ntp server and chrony client for time sync over link-local IPv6

I have two computers connected with an Ethernet cable. The first computer, let's call it the "master" is also connected to the Internet via a wireless network. It's running ntp and getting its time ...
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1answer
1k views

Chrony synchronization

After I configured chrony service on my CentOS 7.3 to point to the active directory, it shows below > chronyc sources 210 Number of sources = 1 MS Name/IP address Stratum Poll Reach ...
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1answer
1k views

ntpd synchronizes but chronyd fails

I am setting up a time server with chronyd but it fails to sync. # chronyc sources 210 Number of sources = 5 MS Name/IP address Stratum Poll Reach LastRx Last sample ==========================...
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1answer
3k views

chrony and gpsd: socket or PPS connection

I've try to get high precision time from gps receiver GlobalSat BU-353s4 (/dev/ttyUSB0) through gpsd in Raspberry PI with ArchLinux. /etc/chrony.conf contains: refclock SHM 0 delay 0.5 refid NEMA ...
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3answers
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Chrony time synchronization on huge time diff

hello currently i have a localy ntp server (chrony) and a ntp client (chrony), all are working but when i try to change ntp server time to say minus 6 years from current time. ntp client cannot sync ...
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2answers
799 views

CentOS, Chrony, and AWS Ports

I'm wondering how to properly configure AWS security to allow chrony to sync system time on a CentOS 7 instance. I was running an earlier version of CentOS 7, which used chrony 1.29.1, and it worked ...
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2answers
4k views

Is there a way to determine how often Chrony is querying NTP servers to sync time?

Is there any way to tell how often Chrony is querying NTP servers? If the answer is that it uses some algorithm based on how much the server has been out of sync in the past, is there some ...
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2answers
17k views

Chrony doesn't appear to be syncing with the servers I've specified

I have set Chrony to sync with 4 NTP servers (config file below). When I run chronyc tracking and chronyc sources, it looks like the servers my machine is connecting to for NTP are not correct. I'd ...
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3answers
10k views

Synchronize clock with NTP while online, and with RTC while offline?

Is there a existing mechanism that synchronizes a linux system with NTP while online, and with a predictably drifting RTC while offline? We operate remote "collectors": embedded Linux systems that ...
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1answer
3k 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 ...