[ntp:questions] NTP architecture with virtual machines for stratum-2 ?

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Tue Mar 5 04:48:31 UTC 2013

janfrode at tanso.net wrote:
> Also, won't an ntpd without a LOCAL clock quickly stop
>  serving time if it's out of sync with it's remote time sources?

Try orphan mode with manycast instead?
 That way if the Corp LAN S1/S2 NTP servers go down,
  they should at least stick together as a time island,
  and pickup the LAN S1/S2(s) when they are accessible again.

# Start ntpd with -g, the -g will prevent a panic stop if the time needs to be steped when started
# ntp.conf for ALL (Clients and/or Servers)
tos cohort 1 orphan 11
restrict default limited kod nomodify notrap
restrict source nomodify
keys "/etc/ntp.keys" # e.g. contains: 123 M LAN_MD5_KEY , 321 M Corp_MD5_KEY , ...
trustedkey 123 321
manycastclient key 123 preempt
multicastclient key 123 preempt
# Corp LAN S1/S2(s)
server tid.tanso.net key 123 iburst prefer preempt
server klokke.tanso.net key 123 iburst prefer preempt

# Add Below, to Corp LAN S1/S2 servers (e.g. tid.tanso.net & klokke.tanso.net)
# Corp LAN S1/S2(s)
peer tid.tanso.net key 123 iburst prefer preempt
peer klokke.tanso.net key 123 iburst prefer preempt
# Corp Remote S1(s)
server clock.corp.example.com key 321 preempt
server tick.sister.example.com key 321 preempt
server tock.brother.example.com key 321 preempt
# Other servers with permission, following access restrictions
# <http://support.ntp.org/bin/view/Servers/RulesOfEngagement>
server time.la4rha.net iburst preempt
server ntp-public.uit.no iburst preempt
server fartein.ifi.uio.no iburst preempt
# <http://www.pool.ntp.org/vendors.html> (Your vendor zone, OS vendor, ...)
pool 0.tanso.pool.ntp.org iburst preempt
pool 0.rhel.pool.ntp.org iburst preempt
pool 0.vmware.pool.ntp.org iburst preempt
# <http://www.pool.ntp.org/zone/@> (Regional pool servers)
pool no.pool.ntp.org iburst preempt
pool europe.pool.ntp.org

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