Date: Tue, 21 Apr 2009 10:39:32 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net> Cc: freebsd-questions@freebsd.org Subject: Re: Preventing ntpd from adjusting time (backwards) Message-ID: <49ED9454.5030100@infracaninophile.co.uk> In-Reply-To: <200904211106.01965.mel.flynn%2Bfbsd.questions@mailing.thruhere.net> References: <200904211106.01965.mel.flynn%2Bfbsd.questions@mailing.thruhere.net>
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[-- Attachment #1 --] Mel Flynn wrote: > Hi, > > Some coarse reading of ntpd(8) and ntp.conf(5) doesn't lead me to believe it's > possible to make ntpd *not* adjust the time. With adjust I don't mean the skew > operation, but really change the time. Backwards is my primary concern but if > it can be turned off completely it's fine with me. > > Reason being dovecot bailing out when this happens: > Apr 1 16:18:26 squish ntpd[1353]: time reset -6.711955 s > > Apr 1 16:18:26 mx1 dovecot: Fatal: Time just moved backwards by 6 seconds. > This might cause a lot of problems, so I'll just kill myself now. > http://wiki.dovecot.org/TimeMovedBackwards > This seems to be a bete-noir for the dovecot developer. Whatever, it is a royal pain in the arse, as my mailserver always steps the time backwards on each reboot, and then dovecot does it's dying swan thing. Three choices: * Don't run 'ntpd -g' as the documentation tells you is the modern and accepted method. Instead, run 'ntpdate' as a separate process and run 'ntpd' without the '-g' flag. * Don't run dovecot. Other IMAP servers do not suffer in the same way. * Put up with it. Avoid reboots, and swear at all concerned any time you really do have to reboot. Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. Flat 3 7 Priory Courtyard PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW, UK [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkntlFkACgkQ3jDkPpsZ+VaoJQCfSseHH1zqD95e2vKKy5RWWbc/ COMAoLSDjR45jJntxvOO64+KiQsfCiPO =nK+B -----END PGP SIGNATURE-----
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