I noticed that on the CentOS 8 installs I’ve done they’re using a single pool statement rather than multiple server lines in /etc/chrony.conf
What’s interesting is that they’re using the IPv6 capable pool address 2.centos.pool.ntp.org instead of say 0.centos or 1.centos.
I wonder if IPv6 had anything to do with their decision to use 2.centos?
The chrony config in previous versions of CentOS looked like this:
server 0.centos.pool.ntp.org iburst
server 1.centos.pool.ntp.org iburst
server 2.centos.pool.ntp.org iburst
server 3.centos.pool.ntp.org iburst
Correct me if I’m wrong but when using the server option instead of the pool option that config would only ever resolve 1 IPv6 NTP source.
The chrony config in CentOS 8 looks like this:
pool 2.centos.pool.ntp.org iburst
The new config using the pool option with 2.centos.pool.ntp.org has the potential to resolve multiple IPv6 NTP sources as opposed to a single source.
I wonder if we’ll see an increase in IPv6 NTP traffic?
In case you’re wondering, CentOS 8 was released on September 24th 2019.