Ubuntu NTP Server Configuration Example

Ubuntu NTP Server Configuration Example



=========================================================================

root@test:/etc# cat ntp.conf

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



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



# Specify one or more NTP servers.



# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board

# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for

# more information.

#server 0.ubuntu.pool.ntp.org

#server 1.ubuntu.pool.ntp.org

#server 2.ubuntu.pool.ntp.org

#server 3.ubuntu.pool.ntp.org

server 127.127.1.0          # Local NTP Address

fudge 127.127.1.0 stratum 10          # NTP Stratum Priority



# Use Ubuntu's ntp server as a fallback.

#server ntp.ubuntu.com



# 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

#restrict 192.168.0.0 mask 255.255.255.0 nomodify notrap          # Permit Local Subnet



# 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

=========================================================================