Questions tagged [chrony]
a pair of programs which are used to maintain the accuracy of the system clock on a computer.
21
questions
0
votes
1answer
57 views
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 ...
0
votes
1answer
29 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 ...
0
votes
2answers
165 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 ...
0
votes
1answer
23 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)...
5
votes
2answers
258 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 ...
2
votes
2answers
259 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
\
...
1
vote
1answer
4k 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 ...
0
votes
2answers
2k views
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 ...
0
votes
1answer
125 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 ...
0
votes
1answer
50 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 ...
2
votes
0answers
481 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 ...
1
vote
0answers
526 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 ...
2
votes
1answer
831 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 ...
1
vote
1answer
768 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
==========================...
1
vote
1answer
2k 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
...
3
votes
3answers
4k views
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 ...
1
vote
2answers
611 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 ...
1
vote
1answer
2k 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 ...
3
votes
2answers
12k 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 ...
11
votes
2answers
8k 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 ...
2
votes
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 ...
