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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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Receiving Kiss of Deaths with chrony

basically I think the issue is that my company NTP server has a Stratum of 5 and it might be laggy at times - but it's maintained by other team so I don't have much info about it. Now I have tested ...
aurelius's user avatar
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mteTrigger snmpTrap not getting fired when NTP is down

I'm trying to generate DISMAN EVENT whenever NTP is down by extending snmp. Have written shell script to extend mib. Using NTPv4-MIB https://datatracker.ietf.org/doc/html/rfc5907. In the custom pass-...
Vijay S B's user avatar
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How it is possible to run two separate chrony instances (on a same pc): one client and one server

All ntp servers and clients are implemented using chrony on RHEL 8.2. NTP client [200.100.1.3] has no access to [NTP server 200.100.1.1]. NTP client [200.100.1.2] has to get time information from NTP ...
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Chrony sync time ignoring maxpoll

I have a Rocky Linux 9.2 server. We monitor it via check_mk and regularly get a warning that last time since sync can exceed 1 hour. Note how in the sources below the mansfield.id.au source is at 64 ...
Jah Crow's user avatar
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NTP symmetric key authentication to chrony servers

Pretty simple question (I think), but in reading chrony's own docs and perusing through RedHat's docs, I can't find a firm answer. Probably because it's too dumb of a question to need an answer :P If ...
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Is chronyc preventing big jumps by itself?

I just realized that Windows server time (w32t service) has two default values limiting how much the offset of the time is allowed to be in negative and positive values. This value is huge by default ...
Stephan Møller's user avatar
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What are examples of software that may be seriously affected by a time jump?

The chrony documentation warns BE WARNED: Certain software will be seriously affected by such jumps in the system time. (That is the reason why chronyd uses slewing normally.) Documentation But the ...
Cecilia's user avatar
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How to interpret small poll, large lastRx and maximum reach value in `chronyc sources` report?

I'm monitoring a chrony client using chronyc sources called every second. This command reports several values including Poll - This shows the rate at which the source is being polled, as a base-2 ...
Cecilia's user avatar
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Why is chrony reporting low offset when my system times are so far apart?

I have two networked voxls which I am trying to synchronize using chrony. The voxls boot up with vastly different system times, like years apart. I would expect chrony to synchronize the times when ...
Cecilia's user avatar
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Chrony doesn´t start in Proxmox container

I have created a container with Debian (Debian 11 template) on top of Proxmox 7.0.8. It is essential that the operating system keep the time synchronized and for this I installed chrony, but it does ...
Francisco's user avatar
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How can my server be both "unreachable" and "online"?

I'm trying to set up a chrony server/client pair. My chrony version is 2.4. When I check the sources on the client side, I see that the server is unreachable chronyc sources -v 210 Number of sources = ...
Cecilia's user avatar
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systemd-timedated.service: Failed to determine whether NTP is enabled: Link has been severed

Encountering this issue with RHEL 7.9 (Maipo). One server in particular is having issues with timedatectl, systemd-timedated.service, and chrony. If we run timedatectl $ timedatectl Failed to query ...
bpaterni's user avatar
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chrony on AlmaLinux 8.6 using unspecified servers [SOLVED]

So I have two (virtual) servers running a fully updated AlmaLinux 8.6. I noticed that regardless of what I put for 'server' or 'pool' entries, chrony seems to insist on also using any DNS servers. I ...
Dan Swartzendruber's user avatar
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Chrony Configuration to Accept Radio Time Signals

Is there a way to have Chrony accept an externally generated clock pulse ? For example, I want to use the Canadian radio time source CHU to provide ticks on the second. Assume that I have the required ...
wbg's user avatar
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NTP traffic causes frequent ARP requests

I am running Ubuntu LTS 22.04 using Chrony as NTP server. I discovered that even with frequent NTP traffic between a NTP client and the NTP Server, the ARP requests are still being sent back and forth ...
RXS's user avatar
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What does 0.0.0.0/0 mean?

For example in an 'allow' statement in BIND or in Chrony config files. Does allow 0.0.0.0/0 mean allowing any clients or allowing no clients? My question isn't about the specific programs, but just ...
madacoda's user avatar
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Does chrony need driftfile to survive a reboot

I'm setting up chrony to run on a flash-based embedded system. Should I put the driftfile in a volatile filesystem (/tmp or /var/run) or one of our flash-based partitions? If I do the former then, ...
kbro's user avatar
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firewalld: outgoing NTP connection will be logged as blocked, but isn't blocked

I have configure firewalld on CentOS7 so it blockes all outgoing connections. Only the needed connections are white listed by adding some rules. Also I have add rules to enable logging of blocked ...
Steffen's user avatar
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chrony: hosting time with RTC as authoritative clock on an air-gapped (isolated) system

I have an isolated and air-gapped LAN that I want to synchronise. I have one host that will be the authoritative time server for all clients on the LAN. It's not important that the LAN time reflects ...
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Chronyc equivalent for ntpdate -q

According to ntpdate and chronyd man pages In ntpdate -q : Query only - don't set the clock. chronyd -q : When run in this mode, chronyd will set the system clock once and exit. It will not detach ...
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chrony set UTC time than Local Time

I installed chrony as NTP server , but Chrony set UTC time/Date to NTP clients not My current system data/time ###############chrony.conf############## server ntp.day.ir iburst driftfile /var/lib/...
Ehsan Ghasisin's user avatar
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2 answers
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NTP/Chrony not keeping time synchronized on CentOS 7.9 (VM running on VMware ESXi)

I have 3 servers running CentOS 7.9.2009 in a data center (VMware ESXi). These servers report that the time is not synchronized. I have a similar test environment running on an inhouse VMware ESXi ...
John Dalsgaard's user avatar
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Ignore chrony source with obviously wrong time

I have a robot and am using timemaster to start chrony and add a PTP source from my GPS. When I start the robot inside where it can't get a satellite fix, the GPS claims it is January 5th, 1980. As a ...
cmshowers's user avatar
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Chrony allow only 2 IP clients

OS: Debian 10.4 Chrony: 3.1 I search how declare 2 IP ADD on /etc/etc/chrony.conf in "allow" option: ';' ',' with: " ' Example: allow "192.168.1.1,192.168.1.2" But this ...
CH06's user avatar
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Is it possible to configure chrony to have different time sources with different priority?

Currently I have a number of Ubuntu 18.04 machines on a local network without internet access configured on chrony to refer to look up to one of them as the "master" as synchronize to it. ...
Otter_warrior's user avatar
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1 answer
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Synchronize clocks with chrony without internet access

I have no experience in this field but I have the task to synchronize a number of Ubuntu 18.04 machines on a local network not connected to the internet. I tried using chrony following the ...
Otter_warrior's user avatar
3 votes
0 answers
11k views

CentOS 8 NTP: Chrony will not Sync with sources, timedatectl showing no sync but NTP active

I have been battling with Chrony for the last few hours and cannot seem to figure out what I'm doing wrong. I found that my system time was set to 2015 when trying to activate Epel-release in DNF, ...
Ryan Smith's user avatar
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1 answer
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The "least bad" settings for Chrony as the NTP server on a virtual machine

I'm tasked with rebuilding a LAN server that's serving as the NTP server for hundreds of client machines. Unfortunately, it's on a virtual machine, and as demonstrated by questions like What are the ...
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chrony startup marks all sources as falseticker

I start chronyd (3.4) with 4 initial servers, 2 remote (from a pool) and 2 local hosts on the same subnet, for example: initstepslew 1 0.xxx.pool.ntp.org 1.xxx.pool.ntp.org 192.168.63.114 192.168.63....
awy's user avatar
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Chronyd inside LXC conatiner

It seems like chronyd doesn't work in lxc containers. The containers running are not unprivileged. Following is showing up with systemd: ● chronyd.service - NTP client/server Loaded: loaded (/usr/...
Lukas Räpple's user avatar
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chrony time server cannot synchronize with time servers from the internet

My chrony time server with the version: 3.5-6ubuntu6.2, can get the time from another internal time server but not from time servers on the Internet. Could you please help me to synchronize my chrony ...
tom's user avatar
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chrony time server not synchronised [closed]

My chrony time server can get the time from another internal time server, but not from time servers on the Internet: chronyc sources 210 Number of sources = 9 MS Name/IP address Stratum Poll ...
tom's user avatar
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chrony time synchronization problems

We have a cluster where exact time synchronization is very important. We use Ubuntu 20.04 servers and and chrony. Unfortunately there are always problems with time synchronization. No other known time ...
tom's user avatar
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Programmatically detect Chrony time sync events

I am working on a sensor system, which runs on an embedded Linux platform and doesn't have access to the internet. An external GPS time server device is connected to provide time synchronization using ...
user601693's user avatar
1 vote
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789 views

PPS Integration with chrony

I am trying to get chrony to ingest a PPS signal to compare against just an NTP server. The PPS signal is recognized when I do ppswatch and ppstest, but when I do chronyc sources, the LastRX field ...
bchang32's user avatar
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1 answer
2k views

Chrony stepping instead of slewing clock

I have a bunch of RHEL 6.8 - 7.4 Azure VMs for which the system clocks are out of sync (up to 300s slow). I'm installing Chrony on them but rather than slewing the clock to the correct time it is ...
user2399020's user avatar
6 votes
1 answer
27k views

"system clock synchronized: no", flip it to yes

# timedatectl outputs Local time: Tue 2020-10-06 13:35:31 PDT Universal time: Tue 2020-10-06 20:35:31 UTC RTC time: Tue 2020-10-06 20:35:30 ...
Katerl3s's user avatar
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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 ...
user1828163's user avatar
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0 answers
490 views

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 ...
Hau Vong's user avatar
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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....
growse's user avatar
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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.
Levi Uzodike's user avatar
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1 answer
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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 ...
Mzq's user avatar
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2 votes
1 answer
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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/...
Bell-guest's user avatar
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1 answer
2k views

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 /...
ImranRazaKhan's user avatar
3 votes
1 answer
14k views

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

We are using chrony in order to sync our Red Hat (7.2) servers with NTP servers. In order to do so, we've configured the logdir /var/log/chrony in chrony.conf and restarted the chrony via systemctl ...
shalom's user avatar
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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 ...
shalom's user avatar
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1 answer
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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 ...
tgz's user avatar
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1 vote
1 answer
284 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 ...
thomas's user avatar
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3 votes
2 answers
7k 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 ...
Eitan Kats's user avatar
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1 answer
46 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)...
aerotec88's user avatar