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Post subject: presny cas v linuxe
 Posted: 05.08.2005 - 07:45 #21719
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Guru
Joined: Jan 30, 2003
Posts: 1572
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| viete mi poradit, akym sposobom sa da zabezpecit, aby si linux cas od casu zistil presny cas a zosuladil sa s nim? |
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Post subject: presny cas v linuxe
Posted: 05.08.2005 - 08:35 #21722
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Basic
Joined: Jan 21, 2004
Posts: 425
Location: Rimavska Sobota
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kiwi wrote: ›viete mi poradit, akym sposobom sa da zabezpecit, aby si linux cas od casu zistil presny cas a zosuladil sa s nim?
ja to robim pomocou ntpdate v spolupraci s cronom |
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Post subject: RE: presny cas v linuxe
Posted: 05.08.2005 - 08:46 #21724
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Majster
Joined: Jan 12, 2003
Posts: 4250
Location: /dev/null
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kiwi: vzdy pri boote si z initscriptov najprv pustim ntpdate, aby si nastavil cas z niecoho o com viem ze ho ma ok, nasledne pustim xntpd, co je daemon ktory sa stara o synchronizaciu casu, teda zabezpecuje ze aj ked hodinovy obvod daneho stroja by mal neaku odchylku tak cas mi neutecie; a este okrem toho vzdy preistotu sejvnem v tom initscripte cas aj do biosovych hodin  |
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Post subject: RE: presny cas v linuxe
Posted: 05.08.2005 - 08:46 #21725
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Basic
Joined: Jún 18, 2004
Posts: 115
Location: Trencin
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Z mojho crontabu
ntpdate -u tock.cs.unlv.edu > /dev/null 2>&1 |
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Post subject: RE: presny cas v linuxe
Posted: 05.08.2005 - 08:58 #21728
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Majster
Joined: Jan 12, 2003
Posts: 4250
Location: /dev/null
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u mna to vyzera asi nasledovne:
rc.inet2:
Code: ›
/usr/sbin/ntpdate 10.8.254.17
/sbin/clock --systohc
/usr/sbin/xntpd
/etc/ntp.conf:
Code: ›
server 10.8.254.17
driftfile /etc/ntp/drift
multicastclient # listen on default 224.0.1.1
broadcastdelay 0.008
logfile /var/log/ntp
authenticate no
pricom na sieti si drzim 2 stroje ako "stratum 2" (ktore si tahaju cas z 194.160.23.2) a zvysne sa syncuju podla nich
PS: v tych okienkach "code" je toho na viac riadkov ako mi to ukaze pri zobrazeni, neviem preco aj pri tak malom okienku tam supne scrollbar  |
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Post subject: RE: presny cas v linuxe
Posted: 05.08.2005 - 11:56 #21737
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Majster
Joined: Okt 19, 2003
Posts: 2339
Location: Bratislava
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| Najlepsie je prevadzkovat xntpd demon, ktory dokaze synchronizovat cas inteligentne. Ma cely rad dalsich zabudovanych funkcii, napr. driftfile na jemnu korekciu hodin, postupnu syncrhonizaciu (aby neboli nahle skoky casu) a pod. Standardne synchronizuje raz za hodinu, ale ked hodiny ubiehaju viac, robit to castejsie. |
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