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• chronyc - command-line interface for chrony daemon 4.2.3. Chronyd Configuration
Edit /etc/chrony/chrony.conf to add/remove server lines. By default these servers are configured:
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
pool 0.ubuntu.pool.ntp.org iburst pool 1.ubuntu.pool.ntp.org iburst pool 2.ubuntu.pool.ntp.org iburst pool 3.ubuntu.pool.ntp.org iburst
See man chrony.conf for more details on the configuration options. After changing the any of the config file you have to restart chrony:
sudo systemctl restart chrony.service
Of the pool 2.ubuntu.pool.ntp.org as well as ntp.ubuntu.com also support ipv6 if needed. If one needs to force ipv6 there also is ipv6.ntp.ubuntu.com which is not configured by default.