[Dovecot] migration from IMAP/POP3 courier server to a remote dovecot server
Dear all
i'm planning a transparent migration from a courier server that provides both IMAP and POP3 access to users to a remote dovecot server with both IMAP and POP3 access.
I have to migrate about 2500 users for 250 GB of space.
I'm using dovecot 2.2.5.4 on debian6 squeeze.
To make a transparent migration i have to maintain old IMAP UIDs and POP3 UIDs, so i've read
http://wiki2.dovecot.org/Migration and http://wiki2.dovecot.org/Migration/Courier and http://wiki2.dovecot.org/Migration/Dsync
And decided that probably the best tool to use is Dsync, as the courier-dovecot-migrate.pl<http://www.dovecot.org/tools/courier-dovecot-migrate.pl> script works only locally.
I've tested the dsync following instructions reported above but after the migration of one test-account the client re-download messages.
If i want to keep both IMAP UIDs and POP3 UIDs i have to sync both imapc and pop3c with two commands?
doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o pop3c_password=bar backup -R -u user@domain imapc:
doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o pop3c_password=bar backup -R -u user@domain pop3c:
Or imapc is enough?
Do you have any suggestion?
Thanks
-- /*************/ nik600 http://www.kumbe.it
to give some more information, i've set
pop3_uidl_format = UID%u-%v
on the courier-side i get this UIDL answer:
UIDL +OK 1 1378040847.Vfe11I12801312M172099.myserver.cloud923 2 UID2-1378040947 3 UID3-1378040947 4 UID4-1378040947 5 UID5-1378040947
on the dovecot-side i get this UIDL answer: UIDL +OK 1 UID1-1378127599 2 UID2-1378127599 3 UID3-1378127599 4 UID4-1378127599 5 UID5-1378127599
2013/9/2 nik600 <nik600@gmail.com>
Dear all
i'm planning a transparent migration from a courier server that provides both IMAP and POP3 access to users to a remote dovecot server with both IMAP and POP3 access.
I have to migrate about 2500 users for 250 GB of space.
I'm using dovecot 2.2.5.4 on debian6 squeeze.
To make a transparent migration i have to maintain old IMAP UIDs and POP3 UIDs, so i've read
http://wiki2.dovecot.org/Migration and http://wiki2.dovecot.org/Migration/Courier and http://wiki2.dovecot.org/Migration/Dsync
And decided that probably the best tool to use is Dsync, as the courier-dovecot-migrate.pl<http://www.dovecot.org/tools/courier-dovecot-migrate.pl> script works only locally.
I've tested the dsync following instructions reported above but after the migration of one test-account the client re-download messages.
If i want to keep both IMAP UIDs and POP3 UIDs i have to sync both imapc and pop3c with two commands?
doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o pop3c_password=bar backup -R -u user@domain imapc:
doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o pop3c_password=bar backup -R -u user@domain pop3c:
Or imapc is enough?
Do you have any suggestion?
Thanks
-- /*************/ nik600 http://www.kumbe.it
-- /*************/ nik600 http://www.kumbe.it
Ok, it seems i found the problem, i was missing the plugin declaration into dovecot.conf
imapc_host = mail.foo.com imapc_features = rfc822.size pop3c_host = mail.foo.com
namespace { separator = / inbox = yes }
protocol doveadm { mail_plugins = $mail_plugins pop3_migration }
disable_plaintext_auth = no pop3_uidl_format = UID%u-%v
And then using command:
*doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o pop3c_password=bar backup -R -u user at domain <http://dovecot.org/cgi-bin/mailman/listinfo/dovecot> pop3c:*
The only doubt i have is how to sync both imap and pop3, i've seen that if i made a pop3c sync ath then impac sync gives an error, and if execute imapc and then pop3c it gives an error too.
2013/9/2 nik600 <nik600@gmail.com>
to give some more information, i've set
pop3_uidl_format = UID%u-%v
on the courier-side i get this UIDL answer:
UIDL +OK 1 1378040847.Vfe11I12801312M172099.myserver.cloud923 2 UID2-1378040947 3 UID3-1378040947 4 UID4-1378040947 5 UID5-1378040947
on the dovecot-side i get this UIDL answer: UIDL +OK 1 UID1-1378127599 2 UID2-1378127599 3 UID3-1378127599 4 UID4-1378127599 5 UID5-1378127599
2013/9/2 nik600 <nik600@gmail.com>
Dear all
i'm planning a transparent migration from a courier server that provides both IMAP and POP3 access to users to a remote dovecot server with both IMAP and POP3 access.
I have to migrate about 2500 users for 250 GB of space.
I'm using dovecot 2.2.5.4 on debian6 squeeze.
To make a transparent migration i have to maintain old IMAP UIDs and POP3 UIDs, so i've read
http://wiki2.dovecot.org/Migration and http://wiki2.dovecot.org/Migration/Courier and http://wiki2.dovecot.org/Migration/Dsync
And decided that probably the best tool to use is Dsync, as the courier-dovecot-migrate.pl<http://www.dovecot.org/tools/courier-dovecot-migrate.pl> script works only locally.
I've tested the dsync following instructions reported above but after the migration of one test-account the client re-download messages.
If i want to keep both IMAP UIDs and POP3 UIDs i have to sync both imapc and pop3c with two commands?
doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o pop3c_password=bar backup -R -u user@domain imapc:
doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o pop3c_password=bar backup -R -u user@domain pop3c:
Or imapc is enough?
Do you have any suggestion?
Thanks
-- /*************/ nik600 http://www.kumbe.it
-- /*************/ nik600 http://www.kumbe.it
-- /*************/ nik600 http://www.kumbe.it
Hi Nik, I realize this is a very old thread, but handling state and UIDs during large-scale migrations (like 2500+ users) is still a common headache today.
While dsync is incredibly powerful, configuring it to perfectly maintain both IMAP and POP3 state simultaneously via CLI can sometimes lead to the exact client re-downloading issues you experienced. For anyone currently tackling a massive Courier to Dovecot migration and wanting to avoid script troubleshooting, you might want to look into the SysTools IMAP Migration Tool.
Instead of running complex synchronized commands, it allows you to map source and destination servers, import your user list in bulk, and run concurrent migrations through a GUI. It manages the folder hierarchy and server handshake automatically, which saves a massive amount of time on 250GB+ migrations.
participants (2)
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mexpert980＠gmail.com
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nik600