cat > $HOME/chrony.conf << EOF
pool time.google.com iburst minpoll 1 maxpoll 2 maxsources 3
pool ntp.ubuntu.com iburst minpoll 1 maxpoll 2 maxsources 3
pool us.pool.ntp.org iburst minpoll 1 maxpoll 2 maxsources 3
# This directive specify the location of the file containing ID/key pairs for
keyfile /etc/chrony/chrony.keys
# This directive specify the file into which chronyd will store the rate
driftfile /var/lib/chrony/chrony.drift
# Uncomment the following line to turn logging on.
#log tracking measurements statistics
# Stop bad estimates upsetting machine clock.
# 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.
# Step the system clock instead of slewing it if the adjustment is larger than
# one second, but only in the first three clock updates.