[CentOS] NTP

[John Summerfield]

Steve Huff wrote:
> 
> On Apr 2, 2007, at 11:32 AM, Ken Godee wrote:
> 
>>> 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?
>>
>>
>> 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.
> 
> 
> how large is your local network?  arguably you should be using at  least 

The size has nothing to do with my preference; I could as easily tell 
them all to sync against pool.ntp.org, time.apple.com, 
time.ubuntulinux.org or any other.

There are good choices to suit all tastes, and a standard centralised 
means of configuring one's preference. RH just ignores it.



> two, and ideally three, timeservers on the local network; ntp  works ok 
> with only one source of time, but times will converge much  more quickly 
> with multiple sources of time.
> 
> don't run 'ntpdate' from a cron job; that defeats the whole purpose  of 
> running ntpd.

Sometimes ntpdate is appropriate; a standalone peecee on dialup might 
run it on every successful connection to the Internet. Even if it means 
shutting down ntpd for a few seconds.







-- 

Cheers
John

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