{"id":926,"date":"2009-11-13T16:44:50","date_gmt":"2009-11-13T14:44:50","guid":{"rendered":"http:\/\/michauko.org\/blog\/?p=926"},"modified":"2009-11-24T16:43:54","modified_gmt":"2009-11-24T14:43:54","slug":"monter-un-serveur-ntp-configurer-les-clients-windows-et-linux","status":"publish","type":"post","link":"https:\/\/michauko.org\/blog\/monter-un-serveur-ntp-configurer-les-clients-windows-et-linux-926\/","title":{"rendered":"Monter un serveur NTP, configurer les clients Windows et Linux"},"content":{"rendered":"

Bon, un p’tit billet aide-m\u00e9moire sur la configuration d’un serveur NTP Linux et des postes Windows et Linux de votre LAN.
\nC’est un sujet tout b\u00eate, mais entre les postes Windows qui ne sont pas tr\u00e8s bavards \u00e0 ce sujet et l’amalgame, c\u00f4t\u00e9 Linux, entre les paquets ntp<\/code> et ntpdate<\/code> utilisant ou pas des fichiers communs de conf, on peut \u00eatre momentan\u00e9ment perdu. J’esp\u00e8re \u00eatre clair par la suite.<\/p>\n

Pr\u00e9parez le serveur<\/h1>\n

Le paquet qui va bien<\/h2>\n

Sur le serveur, installez le paquet \u00ab\u00a0ntp\u00a0\u00bb. Faisant office de serveur, il se met \u00e0 jour (donc il fait office de client, si je ne dis pas connerie). Pas la peine donc d’installer \u00ab\u00a0ntpdate\u00a0\u00bb qui est un autre client possible.
\nLes options du serveur sont dans \/etc\/default\/ntp.conf<\/code>, j’en parle un peu plus bas. Lisez le man<\/code>.
\nLes param\u00e8tres de \/etc\/ntp.conf<\/code> sont :<\/p>\n

serv:~# egrep -v \"^#|^$\" \/etc\/ntp.conf\r\ndriftfile \/var\/lib\/ntp\/ntp.drift\r\nstatistics loopstats peerstats clockstats\r\nfilegen loopstats file loopstats type day enable\r\nfilegen peerstats file peerstats type day enable\r\nfilegen clockstats file clockstats type day enable\r\nserver 0.debian.pool.ntp.org iburst dynamic\r\nserver 1.debian.pool.ntp.org iburst dynamic\r\nserver 2.debian.pool.ntp.org iburst dynamic\r\nserver 3.debian.pool.ntp.org iburst dynamic\r\nrestrict -4 default kod notrap nomodify nopeer noquery\r\nrestrict -6 default kod notrap nomodify nopeer noquery\r\nrestrict 127.0.0.1\r\nrestrict ::1\r\nrestrict 10.0.0.0 mask 255.0.0.0 nomodify notrap<\/pre>\n
J’ai juste ajout\u00e9 la plage 10.0.0.0 (c’est un exemple) pour autoriser mon LAN \u00e0 joindre ce serveur.<\/p>\n
Firewalling ?<\/h2>\n
Il faudra ouvrir en sortie le port \u00ab\u00a0ntp\u00a0\u00bb (123), en UDP, depuis le serveur vers les serveurs amonts. Si c’est la liste par d\u00e9faut de \/etc\/ntp.conf<\/code>, \u00e0 savoir les \u00ab\u00a0*.pool.ntp.org\u00a0\u00bb, c’est une longue liste, amen\u00e9e \u00e0 \u00e9voluer dans le temps je suppose. A vous de voir comment faire. Le plus simple : ouvrir UDP\/123 vers le web, point.
\nPour que les clients joignent votre serveur, c’est pareil, il faudra ouvrir le LAN vers votre passerelle, port UDP\/123.<\/p>\n
Testez<\/h2>\n
Je recommande d’ajouter -l \/var\/log\/ntp.log<\/code> dans les options du fichier \/etc\/default\/ntp<\/code>, soit :<\/p>\n
NTPD_OPTS='-g -l \/var\/log\/ntp.log'<\/pre>\n
Puis de red\u00e9marrer le service via :<\/p>\n
\/etc\/init.d\/ntpd restart<\/pre>\n
Vous verrez dans \/var\/log\/ntp.log<\/code> si votre serveur se met \u00e0 jour, de combien de temps etc. Pensez \u00e0 enlever ce log ou sinon \u00e0 mettre en place une rotation de logs qui va avec<\/strong>.
\nCa ressemble \u00e0 \u00e7a :<\/p>\n
13 Nov 11:19:30 ntpd[18381]: synchronized to 91.121.121.160, stratum 2\r\n13 Nov 11:19:30 ntpd[18381]: time reset -0.169417 s\r\n13 Nov 11:19:30 ntpd[18381]: kernel time sync status change 0001\r\n13 Nov 11:23:57 ntpd[18381]: synchronized to 91.121.121.160, stratum 2\r\n13 Nov 11:31:29 ntpd[18381]: synchronized to 91.121.86.143, stratum 2\r\n13 Nov 11:35:30 ntpd[18381]: time reset +0.189846 s\r\n13 Nov 11:35:50 ntpd[18381]: synchronized to 91.121.121.160, stratum 2\r\n13 Nov 11:40:06 ntpd[18381]: synchronized to 81.19.16.225, stratum 2\r\n13 Nov 11:42:57 ntpd[18381]: synchronized to 91.121.121.160, stratum 2<\/pre>\n
On est maintenant pr\u00eat \u00e0 dire \u00e0 notre LAN d’aller taper sur ce serveur pour r\u00e9gler l’heure.<\/p>\n
Les postes Windows<\/h1>\n
Le service W32Time (\u00ab\u00a0Horloge Windows\u00a0\u00bb) est en automatique par d\u00e9faut depuis Windows XP. Il s’appuie sur le param\u00e8tre qu’on trouvera dans la clef de registre HKLM\/SOFTWARE\/Policies\/Microsoft\/W32Time\/Parameters<\/code>. La clef est \u00ab\u00a0NtpServer\u00a0\u00bb.
\nIl faut donc mettre \u00e0 jour cette clef, d’une mani\u00e8re ou d’une autre.<\/p>\n
…via des GPO<\/h2>\n
Si vous \u00eates en domaine Windows, le r\u00e9glage est ici :
\n\"NTP\"<\/a><\/p>\n
En gros, vous indiquez le nom de votre serveur.
\nVous pouvez forcer la mise \u00e0 jour des GPO sur un poste, pour tester, via gpupdate \/force<\/code>.<\/p>\n
En pas GPO (domaine Samba-sans-GPO, Workgroup etc)<\/h2>\n
Il faut modifier la clef mentionn\u00e9e plus haut, d’une mani\u00e8re ou d’une autre ; et probablement relancer le service \u00ab\u00a0Horloge Windows\u00a0\u00bb.<\/p>\n
Sous Windows, comment tester<\/h2>\n
Le service Windows ne raconte rien et les \u00ab\u00a0event logs\u00a0\u00bb syst\u00e8mes, c’est chiant.
\nJe sugg\u00e8re sur le serveur, un joli tcpdump<\/code> qui vous montrera qui fait quoi :<\/p>\n
serv:~# tcpdump -i eth0 dst port ntp\r\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\r\nlistening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes\r\n15:14:49.071538 IP pc315.maboite.fr.ntp > imag.imag.fr.ntp: NTPv3, symmetric active, length 48\r\n15:14:49.172627 IP imag.imag.fr.ntp > pc315.maboite.fr.ntp: NTPv3, symmetric active, length 48\r\n15:15:29.305824 IP pc666.maboite.fr.ntp > serv.maboite.fr.ntp: NTPv3, symmetric active, length 48\r\n15:15:29.306158 IP serv.maboite.fr.ntp > pc666.maboite.fr.ntp: NTPv3, symmetric active, length 48\r\n<\/pre>\n
L\u00e0, on voit un \u00ab\u00a0pc315\u00a0\u00bb qui continue de demander \u00e0 l’ext\u00e9rieur (le firewall l’autorise pour l’instant) et un pc666 qui a prit le pli.<\/p>\n
Les postes Linux<\/h1>\n
Installez le paquet \u00ab\u00a0ntpdate\u00a0\u00bb et planifiez ntpdate-debian<\/code> en crontab. Le manuel explique : ntpdate-debian utilise le fichier \/etc\/default\/ntpdate<\/code> pour la configuration (liste des serveurs de temps etc). Il contient, sans les commentaires :<\/p>\n
NTPDATE_USE_NTP_CONF=yes\r\nNTPSERVERS=\"0.debian.pool.ntp.org 1.debian.pool.ntp.org 2.debian.pool.ntp.org 3.debian.pool.ntp.org\"\r\nNTPOPTIONS=\"\"<\/pre>\n
Mais, dans ce cas, \u00e0 cause du \u00ab\u00a0yes\u00a0\u00bb, il utilise la conf de l’\u00e9ventuel \/etc\/ntp.conf<\/code> install\u00e9 via le serveur NTP (paquet ntp). Comme on ne l’a pas mis sur les clients (\u00e7a sert \u00e0 rien de faire tourner un serveur NTP), il faut donc soit passer NTPDATE_USE_NTP_CONF<\/code> \u00e0 \u00ab\u00a0no\u00a0\u00bb, soit ne pas planifier ntpdate-debian<\/code>, mais ntpdate<\/code> avec une tartine de param\u00e8tres.
\nSi vous mettez \u00ab\u00a0no\u00a0\u00bb, il faudra indiquer dans NTPSERVERS au moins \/ uniquement votre serveur du LAN. J’ai constat\u00e9 qu’avec le nom de machine, \u00e7a ne passait pas. Mais avec l’IP, c’est OK. A creuser.<\/p>\n
Pig\u00e9 ? moi-m\u00eame, je me perds r\u00e9guli\u00e8rement l\u00e0-dedans.<\/p>\n","protected":false},"excerpt":{"rendered":"
Bon, un p’tit billet aide-m\u00e9moire sur la configuration d’un serveur NTP Linux et des postes Windows et Linux de votre LAN. C’est un sujet tout b\u00eate, mais entre les postes Windows qui ne sont pas …<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[391,2,387,82,389,4],"tags":[420,417,418,419,422,421],"class_list":["post-926","post","type-post","status-publish","format-standard","hentry","category-autres-outils","category-debian","category-ligne-de-commande","category-pl","category-reseau-secu","category-windows","tag-gpo","tag-ntp","tag-ntpd","tag-ntpdate-debian","tag-tcpdump","tag-w32time"],"yoast_head":"\nMonter un serveur NTP, configurer les clients Windows et Linux - Le blog de Michauko<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/michauko.org\/blog\/monter-un-serveur-ntp-configurer-les-clients-windows-et-linux-926\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Monter un serveur NTP, configurer les clients Windows et Linux - Le blog de Michauko\" \/>\n<meta property=\"og:description\" content=\"Bon, un p’tit billet aide-m\u00e9moire sur la configuration d’un serveur NTP Linux et des postes Windows et Linux de votre LAN. 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