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Add chrony

Prerequisites​

Check the NTP Pool project's website to find pools near you.

Install chrony​

Install chrony:

sudo apt install -y chrony

Open /etc/chrony/chrony.conf:

sudo nano /etc/chrony/chrony.conf

And update it as follows:

# Welcome to the chrony configuration file. See chrony.conf(5) for more
# information about usable directives.

# Include configuration files found in /etc/chrony/conf.d.
confdir /etc/chrony/conf.d

# Use Debian vendor zone.
# pool 2.debian.pool.ntp.org iburst

# Australia - https://www.ntppool.org/zone/au
server 0.au.pool.ntp.org iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3
server 1.au.pool.ntp.org iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3
server 2.au.pool.ntp.org iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3
server 3.au.pool.ntp.org iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3

# Use time sources from DHCP.
sourcedir /run/chrony-dhcp

# Use NTP sources found in /etc/chrony/sources.d.
sourcedir /etc/chrony/sources.d

# 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

# Save NTS keys and cookies.
ntsdumpdir /var/lib/chrony

# 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 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.
# This directive must be commented out when using time sources serving
# leap-smeared time.
leapsectz right/UTC

Then save (Ctrl+O) and exit (Ctrl+X) nano.

Restart chrony:

sudo service chrony restart

Resources​