Ok. I'm looking at a client that needs to keep their server time
close as reasonably possible (within a minute) of the actual time of
day. I've installed the RPM for NTP and I'm looking for tips on what
the simplest setup should be, ie:
What server(s) should I be using for sync?
Should I just run it from a cron every 20 minutes or so?
CentOS 4.4 standard NTP install /etc/ntp.conf is set to use the
following NTP servers:
server 0.pool.ntp.org
server 1.pool.ntp.org
server 2.pool.ntp.org
I do wish it would prefer the time server offered by DHCP:-( I'd rather
sync one computer over the Internet, and the rest off my local network.
I'm not a NTP expert but...........
Keeping time in sync within fractions of a second is reasonable.
Google and test a few severs, NTP has a host of tools that will tell
you which servers are responding the best, adjust what servers you use
accordingly.
NTP runs as a daemon and will automatically keep track of time drift and
adjust itself as to how often it needs to poll the servers. If your
system keeps good time it may only poll once an hour.
One server can be set to sync via the internet (firewall/gateway server)
and the rest of the local network syncs to this box, you only need one
server to sync over the internet and then the local network (linux &
windows system) sync to that server.
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