====== Chrony ======
Найкращий сервіс для синхронізації часу - Chrony

===== Налаштування =====
Verify that service //systemd-timesyncd// is not running:
  systemctl status systemd-timesyncd
Stop it if it's running:
  sudo systemctl stop systemd-timesyncd
  sudo systemctl disable systemd-timesyncd
Check also ntp service in same way.

Install chrony:
  sudo apt install chrony
Update config ///etc/chrony/chrony.conf//:
<file - chrony.conf>
# Welcome to the chrony configuration file. See chrony.conf(5) for more
# information about usuable directives.
#pool 2.debian.pool.ntp.org iburst
pool 0.fr.pool.ntp.org iburst prefer
pool 1.fr.pool.ntp.org iburst
pool 1.europe.pool.ntp.org iburst
pool ntp.ovh.net iburst

# This directive specify the location of the file containing ID/key pairs for
# NTP authentication.
keyfile /etc/chrony/chrony.keys

# This directive specify the file into which chronyd will store the rate
# information.
driftfile /var/lib/chrony/chrony.drift

# Uncomment the following line to turn logging on.
#log tracking measurements statistics

# Log files location.
logdir /var/log/chrony

# Stop bad estimates upsetting machine clock.
maxupdateskew 100.0

# This directive tells 'chronyd' to parse the 'adjtime' file to find out if the
# real-time clock keeps local time or UTC. It overrides the 'rtconutc' directive.
hwclockfile /etc/adjtime

# This directive enables kernel synchronisation (every 11 minutes) of the
# real-time clock. Note that it can’t be used along with the 'rtcfile' directive.
#rtcsync

# Step the system clock instead of slewing it if the adjustment is larger than
# one second, but only in the first three clock updates.
makestep 1 3

# Get TAI-UTC offset and leap seconds from the system tz database.
leapsectz right/UTC
</file>
Adjust pool according to server's DC.

Restart chrony:
  sudo systemctl restart chrony
And verify it's running:
  chronyc sources -v  

===== Посилання =====
  * [[https://www.pool.ntp.org/uk/zone/ua|NTP pools]]
  * [[https://opensource.com/article/20/6/time-date-systemd|Control your computer time and date with systemd]]
  * [[https://opensource.com/article/18/12/manage-ntp-chrony|Manage NTP with Chrony]]