[linux] NTP server
Peter Viskup
skupko.sk na gmail.com
Středa Únor 3 22:22:22 CET 2010
Ahoj Lubo,
zda sa Ti, ze by DNS pre pool.ntp.org nebolo zabezpecene proti vypadku
niektoreho z NS serverov?
Okrem toho ked skonfigurujes svojho NTP klienta podla navodu na tej
stranke, tak nebudes mat so ziadnym vypadkom NTP synchronizacie problem
(jedine, ze Ti odide pripojenie do internetu).
Pokial chces zadefinuj si synchronizaciu aj s desiatimi servermi z
pool.ntp.org, ale tie tri by mali celkom stacit aj pre paranoika.
peter at kronos:~$ dig +qr pool.ntp.org ns
; <<>> DiG 9.6.1-P2 <<>> +qr pool.ntp.org ns
;; global options: +cmd
;; Sending:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12367
;; flags: rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;pool.ntp.org. IN NS
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12367
;; flags: qr rd ra; QUERY: 1, ANSWER: 9, AUTHORITY: 0, ADDITIONAL: 11
;; QUESTION SECTION:
;pool.ntp.org. IN NS
;; ANSWER SECTION:
pool.ntp.org. 86400 IN NS h.ntpns.org.
pool.ntp.org. 86400 IN NS i.ntpns.org.
pool.ntp.org. 86400 IN NS a.ntpns.org.
pool.ntp.org. 86400 IN NS b.ntpns.org.
pool.ntp.org. 86400 IN NS c.ntpns.org.
pool.ntp.org. 86400 IN NS d.ntpns.org.
pool.ntp.org. 86400 IN NS e.ntpns.org.
pool.ntp.org. 86400 IN NS f.ntpns.org.
pool.ntp.org. 86400 IN NS g.ntpns.org.
;; ADDITIONAL SECTION:
a.ntpns.org. 40131 IN A 78.153.203.28
b.ntpns.org. 40131 IN A 194.106.223.156
c.ntpns.org. 17143 IN A 212.200.82.148
d.ntpns.org. 40131 IN A 94.23.191.112
e.ntpns.org. 40131 IN A 70.85.157.108
f.ntpns.org. 1166 IN A 207.171.7.84
f.ntpns.org. 1166 IN A 118.67.212.230
g.ntpns.org. 40131 IN A 80.96.148.8
h.ntpns.org. 40131 IN A 212.12.50.229
h.ntpns.org. 40131 IN A 85.214.25.217
i.ntpns.org. 40131 IN A 141.89.226.53
;; Query time: 2481 msec
;; SERVER: 213.151.200.30#53(213.151.200.30)
;; WHEN: Wed Feb 3 22:17:19 2010
;; MSG SIZE rcvd: 356
Ľubomír Varga wrote:
> Myslim, ze kolega narazal na to, ze ak vypadne server pool.ntp.org, alebo DNS
> server bude vracat zlu ipecku (premiestnenie serveru, omyl a podobne), tak
> zrazu sa nebude voci comu synchronizovat.
>
> Servre na ktore mam pristup vyuzivaju asi najcastejsie "studentsky" ntp
> server, ktory je dostupny na ntp .ynet.sk.
>
> Princip i realizacia ntp pool projektu sa mi vsak paci a asi ho skusim
> presadit ako dalsi "server" pre synchronizaciu.
>
> On Wednesday 03 February 2010 21:57:08 Peter Viskup wrote:
>
>> Len pre upresnenie.
>> Servery z pool.ntp.org nie su na sebe zavisle a pouzitie 'iba' serverov
>> z tohto poolu je uplne dostacujuce.
>> Viac info na http://www.pool.ntp.org/.
>> A nejaky ten popis ako skonfigurovat NTP klienta a pouzivat pool.ntp.org
>> http://www.pool.ntp.org/en/use.html.
>>
>> --
>> Peter Viskup
>>
>> Ing. Ján ONDREJ wrote:
>>
>>> On Wed, Feb 03, 2010 at 03:27:10PM +0100, patrik at foral.sk wrote:
>>>
>>>> Ahoj. Prosim poradte nejaky doveryhodny server pre synchronizaciu
>>>> casu. Nieco som vygooglil, no tie domeny nepoznam, takze neviem
>>>> posudit doveryhodnost. Dakujem.
>>>>
>>> Okrem toho uz spominaneho pool.ntp.org doporucujem pouzit este nejake
>>> navyse. Ak ich budes mat viac, tak by mali vediet cas synchronizovat
>>> lepsie a nebudes ohrozeny vypadkom jednej domeny.
>>>
>>> Kazdopadne ntpd neposuva cas o velke hodnoty, takze ak ta bude chciet aj
>>> niektory zo serverov sabotovat, tak mozu akurat tak mierne spomalit cas,
>>> co sa ti neskor vyrovna, ked sa pripojis na iny server.
>>>
>>> Ak by si ale pouzival z cronu ntpdate, co sa nedoporucuje, tak by si
>>> mohol mat problemy.
>>>
>>> SAL
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