# For more information about this file, see the man pages
# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).

driftfile /var/lib/ntp/drift

# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default nomodify notrap nopeer noquery

# Permit all access over the loopback interface.  This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
restrict ::1

# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
{% if ntp_define_servers_pool  %}
{% for pool_ip in ntp_servers_pool %}
server {{ pool_ip }} prefer iburst
{% endfor %}
{% else %}
server 0.centos.pool.ntp.org iburst
server 1.centos.pool.ntp.org iburst
server 2.centos.pool.ntp.org iburst
server 3.centos.pool.ntp.org iburst
{% endif %}

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
{% if nagios_monitoring_server_ip is defined %}
{% for ip in nagios_monitoring_server_ip %}
restrict {{ ip }} mask 255.255.255.255 notrap nomodify
{% endfor %}
{% endif %}
{% if ntp_allow_external_clients %}
{% for host in ntp_allowed_clients %}
restrict {{ host.ip }} mask {{ host.netmask }} {% if host.options is defined %}{{ host.options }}{% else %}notrap nomodify{% endif %}

{% endfor %}
{% endif %}

#broadcast 192.168.1.255 autokey        # broadcast server
#broadcastclient                        # broadcast client
#broadcast 224.0.1.1 autokey            # multicast server
#multicastclient 224.0.1.1              # multicast client
#manycastserver 239.255.254.254         # manycast server
#manycastclient 239.255.254.254 autokey # manycast client

# Enable public key cryptography.
#crypto

includefile /etc/ntp/crypto/pw

# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys

# Specify the key identifiers which are trusted.
#trustedkey 4 8 42

# Specify the key identifier to use with the ntpdc utility.
#requestkey 8

# Specify the key identifier to use with the ntpq utility.
#controlkey 8

# Enable writing of statistics records.
{% if ntp_statistics_enabled %}
statsdir /var/log/ntpstats/

statistics clockstats cryptostats loopstats peerstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
{% endif %}

# Disable the monitoring facility to prevent amplification attacks using ntpdc
# monlist command when default restrict does not include the noquery flag. See
# CVE-2013-5211 for more details.
# Note: Monitoring will not be disabled with the limited restriction flag.
disable monitor