[ntp:questions] Correcting a large time difference

unruh unruh at wormhole.physics.ubc.ca
Sat Jul 31 15:48:24 UTC 2010

On 2010-07-30, Richard Heritage <rheritage at jhu.edu> wrote:
> I've inherited a RHEL 5 server that isn't running ntp and whose clock is about 30 minutes fast. What I would like to do is start ntpd & have it gradually correct the clock. I don't care how long it takes--it's been running this way for months. The server runs an email application that may be sensitive to a large backward jump in the clock, and leaving the server down for a half hour isn't a good option. 

Use chrony rather than ntpd. It will adjust the time much faster ( but
no jumps) and does not have the .125s rule. 

> I don't know ntp very well, but from reading it appeared to me that if I put "tinker panic 0" in ntp.conf and started ntp with the -x option it would do what I want. However, on a test server the correction occurred all at once. Is there a way to accomplish what I want?
> Richard Heritage
> Lead System Software Engineer
> IT @ Johns Hopkins

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