FYI for dovecot users

Check this out
http://wiki.dovecot.org/TimeMovedBackwards

My solution, move dovecot start up links to start after ntpd.

In /etc/init.d/dovecot
change # chkconfig: 345 54 46
to # chkconfig: 345 57 46

then do a
service dovecot stop
chkconfig --del dovecot
chkconfig --add dovecot
service dovecot start

I happen to have created and install_changes script to automate all my
custom changes after a clean install. dovecot snippet follows:

#*******************************
# dovecot fix
#*******************************

_fn=/etc/init.d/dovecot
if [ -e $_fn ] ; then
if [ ! -e ${_fn}_orig ] ; then
echo "fixing $_fn"
cp $_fn ${_fn}_orig
chmod -x ${_fn}_orig
/bin/cp /dev/null $_fn
while read line ; do
set -- $line
if [ "$2" = "chkconfig:" ] ; then
line="# chkconfig: 345 57 46"
fi
if [ "$2" = "\"Usage:" ] ; then
line=" gprintf \"Usage: %s {start|stop|restart|reload|condrestart|status}\\n\" \"\$0\" "
fi
echo "$line" >> $_fn
done < ${_fn}_orig
fi

service dovecot stop
/sbin/chkconfig --del dovecot
/sbin/chkconfig --add dovecot
service dovecot start
fi

_fn=/etc/dovecot.conf
if [ -e $_fn ] ; then
if [ ! -e ${_fn}_orig ] ; then
echo "fixing $_fn"
cp $_fn ${_fn}_orig
chmod -x ${_fn}_orig
/bin/cp /dev/null $_fn
while read line ; do
set -- $line
if [ "$1" = "#mail_location" ] ; then
line="mail_location = mbox:~/mail:INBOX=/var/spool/mail/%u"
fi
if [ "$1" = "#protocols" ] ; then
line="protocols = imap imaps"
fi
echo "$line" >> $_fn
done < ${_fn}_orig
fi
fi

On Fri, 17 Oct 2008 19:03:45 +0000 (UTC), Bit Twister wrote:
> Check this out
> http://wiki.dovecot.org/TimeMovedBackwards
>
> My solution, move dovecot start up links to start after ntpd.
>
> In /etc/init.d/dovecot
> change # chkconfig: 345 54 46
> to # chkconfig: 345 57 46
>
> then do a
> service dovecot stop
> chkconfig --del dovecot
> chkconfig --add dovecot
> service dovecot start
>

If using ntp, you might consider changing the /etc/init.d/dovecot header to read

#!/bin/bash
#
# Init file for Dovecot IMAP daemon
#
# Written by Dag Wieers .
#
# chkconfig: 345 57 46
# description: Dovecot IMAP Daemon
#
# processname: dovecot
# config: /etc/dovecot.conf
# pidfile: /var/run/dovecot
### BEGIN INIT INFO
# Provides: dovecot
# Should-Start: ntpd
# Default-Start: 3 4 5
# Short-Description: Starts dovecot daemon
# Description: Dovecot IMAP Daemon
### END INIT INFO

# source function library

On Fri, 17 Oct 2008 15:03:45 -0400, Bit Twister wrote:

> Check this out
> http://wiki.dovecot.org/TimeMovedBackwards
>
> My solution, move dovecot start up links to start after ntpd.

So for systems where the clock is set to localtime, will it be a problem
using dovecot between Sunday, November 2, 2008 at 0200 Daylight Saving time
and 0200 Standard time?

Looking at the code (in dovecot-1.1.3/src/lib/ioloop.c), it'll sleep if the
time has moved back by 5 seconds or less, but will terminate with an error
message, if the time is more than 5 seconds.

Looks like it will die when Standard time kicks in, and will be down for
an hour. Pretty messy way to handle things.

Regards, Dave Hodgins

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David W. Hodgins wrote:

> So for systems where the clock is set to localtime, will it be a problem
> using dovecot between Sunday, November 2, 2008 at 0200 Daylight Saving
> time and 0200 Standard time?

I doubt it. DST & timezone offsets are applied when rendering the clock into
a human-readable form. I would expect dovecot to use some form of the
system clock which is typically UTC.

Simon

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