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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NTP / Chrony time sync with no external source
we have a customer who doesn't allow internet access, so all servers are in their own clock mode.
we used windows Domain controller to be the Source but as it cant talk to internet, STRATUM is low so ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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How to delete chrony server from client side without restart service
I am trying to setup chrony client server on local and try to add chrony server and delete on the fly
I am able to add without needing to restart chrony using this command 'chronyc add server iburst ...
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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 = ...
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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 ...
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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 ...
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Chrony seems to be synchronized, but kernel keeps unsynchronized flag for the system clock
I have a chrony service (version 3.4-4+deb10u2 - Debian 10) that seems to be running correctly:
chronyc tracking
Reference ID : A29FC801 (time.cloudflare.com)
Stratum : 4
Ref time (UTC) : ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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/...
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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 ...
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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 ...
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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 ...
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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.
...
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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 ...
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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, ...
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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....
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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/...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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"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
...
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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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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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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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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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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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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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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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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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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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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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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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