Migrate from 2.2.13 to 2.4.17 disasters

[Niels Dettenbach]

Am Montag, 24. August 2015, 16:29:55 schrieb Mogens Melander:
> It should be possible, using the cyrus admin account. But I'm
> sure there will be something about this in the imapsync docs.


cyrus <-> imapsync mini HOWTO
===========================

To migrate your postboxes from one to another cyrus or IMAP host by IMAP:

in your

	imapd.conf

set a cyrus admin user if not done til now:

	
	admins:  cyrus

and make sure it has a password / is available by cyrus auth subsys as other cyrus users.



Use imapsync with

	--authuser1 /source host)
	--authuser2 (target host)

instead of the mailbox account users:

	---user[1|2]

after experiments i have found that the following additional imapsync parameters could be helpful in a site migration scenario:

	--addheader 

-> this makes sure that the timestamps of the mail is the original one if all your copied messages are shown with a new timestamp / date from "today" in the target mailbox. imapsync uses the timestamps from the original mail headers instead which are "much closer" the original date.


	--usecache

-> could speed up the migration significantly.


	--timeout 

-> set this higher if you get timeout problems.

The nice thing is that you can restart the whole process anytime again later if the migration stops or connections breaks.


You may use this script as a starting point. It is a bit more generic as it allows / accepts different account names on source / target site (may be simplified further):


#!/bin/bash
#####################################
# sync old imap account with new one
# on syndicat.com mailhost
# (c) 2015 Niels Dettenbach
# <nd at syndicat.com>
# GPL licensed
#####################################

usage="usage: imapsync_intrans <oldhost> <oldadminuser> <oldadminpassword> <newadminuser> <newadminpass> <newhost>"
imapsync=`which imapsync`

if [ $imapsync ]
then
   if [ $5 ]
   then
      echo "start IMAP sync $2 <-> $4:"
      $imapsync \
         --host1 $1 --authuser1 $2 --password1 $3 \
         --host2 $6 --authuser2 $4 --password2 $5 \
         --addheader --ssl1 --timeout 15
   else
      echo $usage
   fi
else
   echo "no imapsync found!"
fi

-- 
 ---
 Niels Dettenbach
 Syndicat IT & Internet
 http://www.syndicat.com
 PGP: https://syndicat.com/pub_key.asc
 ---
 



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