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Microlinux – Solutions informatiques durables
7, place de l’église – 30730 Montpezat Site : https://www.microlinux.fr Mail : info@microlinux.fr Tél. : 04 66 63 10 32
Mob. : 06 51 80 12 12
I used chrony at home, a couple of decades ago (give or take) way back when I was on dialup, because if its ability to serve time to machines that are not always connected.
Since it is now the default NTP provider for EL7 I use it again, and it still works fine for my needs.
Fred
YMMV.
I have used NTP for many, many years so I am familiar with it and also have ALL config files, I normally just delete chrony and install ntpd, then copy the config files and start ntp. All done, 2 minutes.
Chrony cannot supply time info, so if you have clients requesting time info the server cannot serve time, you need ntpd for that. I have many windows stations that pull time from my CentOS servers.
Back when I used chrony in my home LAN it certainly did serve time. I
brought it up on my firewall (an old PC running SmoothWall) as a local time server and it worked great for that purpose.
It’s hard to imagine that someone would have REMOVED that ability in the intervening years….
I read a couple of comparisons some time back, I learned chrony cannot server time. The comparison might have been wrong!
That is not correct. In the default config, chrony doesn’t serve time, which is a good thing (see: all the problems with ntpd serving a lot more than time). All you have to do is uncomment/add “allow” lines in
/etc/chrony.conf.
9 thoughts on - Question About Ntp
I more or less depend on NTP and synchronize against my public upstream NTP servers. The only system that runs chrony is my FreeIPA server.
Regards, Ben
*Sigh* I mean “provided”. It’s too early.
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Jonathan Billings
chrony syncs to an NTP server, in the same way that ntp syncs to an NTP
server. The both work.
I have both ntpd (under CentOS 6) and chronyd (under CentOS 7) NTP
servers on my network, they all work fine together.
P.
Le 27/05/2019 à 06:32, Ralf Prengel a écrit :
Chrony is the standard way, but one of the first things I do when installing a CentOS server is replace it with NTP.
Here’s a short blog article (in french) about NTP on CentOS.
* https://www.microlinux.fr/CentOS-7-ntp/
Cheers,
Niki
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Microlinux – Solutions informatiques durables
7, place de l’église – 30730 Montpezat Site : https://www.microlinux.fr Mail : info@microlinux.fr Tél. : 04 66 63 10 32
Mob. : 06 51 80 12 12
I used chrony at home, a couple of decades ago (give or take) way back when I was on dialup, because if its ability to serve time to machines that are not always connected.
Since it is now the default NTP provider for EL7 I use it again, and it still works fine for my needs.
Fred
YMMV.
I have used NTP for many, many years so I am familiar with it and also have ALL config files, I normally just delete chrony and install ntpd, then copy the config files and start ntp. All done, 2 minutes.
Chrony cannot supply time info, so if you have clients requesting time info the server cannot serve time, you need ntpd for that. I have many windows stations that pull time from my CentOS servers.
Back when I used chrony in my home LAN it certainly did serve time. I
brought it up on my firewall (an old PC running SmoothWall) as a local time server and it worked great for that purpose.
It’s hard to imagine that someone would have REMOVED that ability in the intervening years….
I read a couple of comparisons some time back, I learned chrony cannot server time. The comparison might have been wrong!
I just read this, so I stand corrected:
https://chrony.tuxfamily.org/comparison.html
Once upon a time, Jobst Schmalenbach said:
That is not correct. In the default config, chrony doesn’t serve time, which is a good thing (see: all the problems with ntpd serving a lot more than time). All you have to do is uncomment/add “allow” lines in
/etc/chrony.conf.