/etc/cloud/templates/ntp.conf.opensuse.tmpl is in cloud-init 18.2-14-g6d48d265-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## Radio and modem clocks by convention have addresses in the
## form 127.127.t.u, where t is the clock type and u is a unit
## number in the range 0-3.
##
## Most of these clocks require support in the form of a
## serial port or special bus peripheral. The particular
## device is normally specified by adding a soft link
## /dev/device-u to the particular hardware device involved,
## where u correspond to the unit number above.
##
## Generic DCF77 clock on serial port (Conrad DCF77)
## Address: 127.127.8.u
## Serial Port: /dev/refclock-u
##
## (create soft link /dev/refclock-0 to the particular ttyS?)
##
# server 127.127.8.0 mode 5 prefer
##
## Undisciplined Local Clock. This is a fake driver intended for backup
## and when no outside source of synchronized time is available.
##
# server 127.127.1.0 # local clock (LCL)
# fudge 127.127.1.0 stratum 10 # LCL is unsynchronized
##
## Add external Servers using
## # rcntpd addserver <yourserver>
## The servers will only be added to the currently running instance, not
## to /etc/ntp.conf.
##
{% if pools %}# pools
{% endif %}
{% for pool in pools -%}
pool {{pool}} iburst
{% endfor %}
{%- if servers %}# servers
{% endif %}
{% for server in servers -%}
server {{server}} iburst
{% endfor %}
# Access control configuration; see /usr/share/doc/packages/ntp/html/accopt.html for
# details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.
# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default notrap nomodify nopeer noquery
restrict -6 default notrap nomodify nopeer noquery
# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1
# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust
##
## Miscellaneous stuff
##
driftfile /var/lib/ntp/drift/ntp.drift # path for drift file
logfile /var/log/ntp # alternate log file
# logconfig =syncstatus + sysevents
# logconfig =all
# statsdir /tmp/ # directory for statistics files
# filegen peerstats file peerstats type day enable
# filegen loopstats file loopstats type day enable
# filegen clockstats file clockstats type day enable
#
# Authentication stuff
#
keys /etc/ntp.keys # path for keys file
trustedkey 1 # define trusted keys
requestkey 1 # key (7) for accessing server variables
controlkey 1 # key (6) for accessing server variables
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