[Linux] Installation d’un serveur NTP

 

Installation d’un serveur NTP

 

Version de l’OS: Centos 6.8

 

Installer le paquet (si non présent)

$ sudo yum install ntp

 

Modifier le fichier de conf

$ sudo vim /etc/ntp.conf

 

# 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 kod nomodify notrap nopeer noquery
 restrict -6 default kod 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 -6 ::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).
#server 0.centos.pool.ntp.org   <--- Commenter ligne
#server 1.centos.pool.ntp.org   <--- Commenter ligne
#server 2.centos.pool.ntp.org   <--- Commenter ligne
#server 3.centos.pool.ntp.org   <--- Commenter ligne
server 0.fr.pool.ntp.org   <--- Ajouter srv Fr
server 1.fr.pool.ntp.org   <--- Ajouter srv Fr
server 2.fr.pool.ntp.org   <--- Ajouter srv Fr

#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.
#statistics clockstats cryptostats loopstats peerstats

 

 

Puis

$ sudo vim /etc/ntp/step-tickers

 

# List of servers used for initial synchronization.
server 0.fr.pool.ntp.org   <--- Ajouter srv Fr
server 1.fr.pool.ntp.org   <--- Ajouter srv Fr
server 2.fr.pool.ntp.org   <--- Ajouter srv Fr

 

 

Démarrer le service NTP et ajouter le service au démarrage du système

$ sudo service ntpd start
$ sudo chkconfig ntpd on

 

Faire un test

$ sudo ntpq -p

Qui renvoie

remote refid st t when poll reach delay offset jitter
===========================================================
+ns1.pulsation.f 195.13.23.5 3 u 1 64 377 35.969 17.507 1.535
*arm.wtfismyip.c 129.69.1.153 2 u 63 64 377 28.379 21.069 2.822
+ks3361453.kimsu 37.187.2.84 3 u 66 64 377 32.050 21.898 3.198

 

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