| Stephen Gran on Thu, 09 Jan 2003 20:21:05 -0500 |
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On Thu, Jan 09, 2003 at 06:58:32PM -0500, eric@lucii.org said: > Whoa! I wanted to do this for months (my Linux server clock drifts) > but did not know how. The ntp documentation was completly confusing > and did not do what I wanted. > > I grabbed the rdate rpm, installed it on my systems, set the cron and > viola' - it works. Nice. Very nice. > > Thanks. > > Eric There was actually just a long thread on debian-user about this, called 'ntpdate from CRON - DON'T DO THAT!!!' or something along those lines. The gist of it was that cron jobs all hammer the time servers at the same time, so there is a much greater chance to create DoS's accidentally. The recommendation was to use something designed for the job, like ntpd or chrony, which make the adjustments at mostly random times, reducing the odds of an accidental DoS, and also have mechanisms to notice and adjust for (local) clock drift, making the network adjustments less necessary over time. If you're having problems with ntpd, let me know - I just set it up on a couple of boxes here, and it's very nice. DCA.net also runs a timeserver, which makes life easy (^: All of this advice is second hand - I have never run a time server open to the 'net, and I have no idea how easy it would be to hammer one into submission. It makes sense to treat a free service with some gentleness and respect, however. HTH, -- -------------------------------------------------------------------------- | Stephen Gran | BOFH excuse #17: fat electrons in the | | steve@lobefin.net | lines | | http://www.lobefin.net/~steve | | -------------------------------------------------------------------------- Attachment:
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