sonic-buildimage/files/image_config/ntp/ntp.conf.j2

###############################################################################
# Managed by Ansible
# file: ansible/roles/acs/templates/ntp.conf.j2
###############################################################################

# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

# To avoid ntpd from panic and exit if the drift between new time and
# current system time is large.
tinker panic 0

driftfile /var/lib/ntp/ntp.drift


# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable


# You do need to talk to an NTP server or two (or three).
#server ntp.your-provider.example

# pool.ntp.org maps to about 1000 low-stratum NTP servers.  Your server will
# pick a different set every time it starts up.  Please consider joining the
# pool: <http://www.pool.ntp.org/join.html>
{% for ntp_server in NTP_SERVER %}
server {{ ntp_server }} iburst
{% endfor %}

#listen on source interface if configured, else 
#only listen on MGMT_INTERFACE, LOOPBACK_INTERFACE ip when MGMT_INTERFACE is not defined, or eth0 
# if we don't have both of them (default is to listen on all ip addresses)
interface ignore wildcard

# set global variable for configured source interface name
# set global boolean to indicate if the ip of the configured source interface is configured
# if the source interface is configured but no ip on that interface, then listen on another
# interface based on existing logic
{%- macro check_ip_on_interface(interface_name, table_name) %}
    {%- if table_name %}
        {%- for (name, source_prefix) in table_name|pfx_filter %}
            {%- if source_prefix and name == interface_name %}
true
            {%- endif %}
        {%- endfor %}
    {%- endif %}
{%- endmacro %}

{% set ns = namespace(source_intf = "") %}
{% set ns = namespace(source_intf_ip = 'false') %}
{% if (NTP) and (NTP['global']['src_intf'])  %}
    {% set ns.source_intf = (NTP['global']['src_intf']) %}
    {% if ns.source_intf != "" %}
        {% if ns.source_intf == "eth0" %}
            {% set ns.source_intf_ip = 'true' %}
        {% elif ns.source_intf.startswith('Vlan') %}
            {% set ns.source_intf_ip = check_ip_on_interface(ns.source_intf, VLAN_INTERFACE) %}
        {% elif ns.source_intf.startswith('Ethernet') %}
            {% set ns.source_intf_ip = check_ip_on_interface(ns.source_intf, INTERFACE) %}
        {% elif ns.source_intf.startswith('PortChannel') %}
            {% set ns.source_intf_ip = check_ip_on_interface(ns.source_intf, PORTCHANNEL_INTERFACE) %}
        {% elif ns.source_intf.startswith('Loopback') %}
            {% set ns.source_intf_ip = check_ip_on_interface(ns.source_intf, LOOPBACK_INTERFACE) %}
        {% endif %}
    {% endif %}
{% endif %}

{% if ns.source_intf_ip == 'true' %}
interface listen {{ns.source_intf}}
{% elif (NTP) and NTP['global']['vrf'] == 'mgmt' %}
interface listen eth0
{% elif MGMT_INTERFACE %}
{% for (mgmt_intf, mgmt_prefix) in MGMT_INTERFACE|pfx_filter %}
interface listen {{ mgmt_prefix | ip }}
{% endfor %}
{% elif LOOPBACK_INTERFACE %}
{% for (name, prefix) in LOOPBACK_INTERFACE|pfx_filter %}
{% if prefix | ipv4 and name == 'Loopback0' %}
interface listen {{ prefix | ip }}
{% endif %}
{% endfor %}
{% else %}
interface listen eth0
{% endif %}
interface listen 127.0.0.1

# Access control configuration; see /usr/share/doc/ntp-doc/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 kod notrap nomodify nopeer noquery
restrict -6 default kod 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


# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient