Serveur/NTP

Installation du service NTPD, le serveur de temps :

sudo apt-get install ntp

Le fichier de configuration

# /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.
pool 0.fr.pool.ntp.org
pool 1.fr.pool.ntp.org
pool fr.pool.ntp.org

server chronos.espci.fr         #Renater - Physique Chimie Paris, France
server ntp.ensma.fr             #ENSMA, Futuroscope, Poitiers, France
server ntp1.jussieu.fr          #Universités Paris VI/Paris VII Jussieu, France
server ntp.obspm.fr             #LNE-SYRTE - Observatoire de Paris, Paris, France
server ntp.polytechnique.fr     #École Polytechnique - Plateau de Saclay, France
server ntp.u-psud.fr            #CRI, Campus d'Orsay, Université Paris Sud, France
server ntp.via.ecp.fr           #VIA, École Centrale Paris, France

# Use Ubuntu's ntp server as a fallback.
pool ntp.ubuntu.com

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page 
# 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 limited
restrict -6 default kod notrap nomodify nopeer noquery limited

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1
# Needed for adding pool entries
restrict source notrap nomodify noquery

# 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

#Changes required to use pps synchonization as explained in documentation:
#http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918

#server 127.127.8.1 mode 135 prefer    # Meinberg GPS167 with PPS
#fudge 127.127.8.1 time1 0.0042        # relative to PPS for my hardware

#server 127.127.22.1                   # ATOM(PPS)
#fudge 127.127.22.1 flag3 1            # enable PPS API

Appliquer la configuration en relançant le service

sudo service ntp restart

Vérifier que cela fonctionne, et valider les serveurs utilisés

ntpq -p

Utiliser le serveur depuis une autre machine

sudo ntpdate server-name

Sources :
doc.ubuntu-fr.org/ntp
doc.ubuntu-fr.org/ntpdate

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