Migrate Mail from ISPConfig3 Master to Slave

Hi,
Apologies if this has been covered but I tried searching first. I found several similar threads but nothing for this particular circumstance.
My set up is as follows:

• host MASTER1 is ISPConfig master server
• host SYSTEMS1 is ISPConfig slave server
• currently MASTER1 runs email

I now have a need to get all mail off MASTER1 and onto SYSTEMS1. This means: mail domains, forwards, mailboxes (containing emails), etc.

Is there a feature for this?
Or if not, what is the process I need to follow?

Note that these servers and mail domains are currently in production so I need to:

1. try to minimise downtime as much as possible
2. be pretty certain of the process so I don't make any mistakes.

Many thanks for your help.
Cheers
Geoff.

 

If you use dovecot, you can replicate the mails between two servers using dovecot´s dsync.
Define system1 as a mirror for mail.
Resync mail (to make sure the configs exists on the new system1) (*)
Setup dovecot-replication and wait until the sync is done
Switch the IPs for mail in the dns
Remove "mirror for mail" and change the server_id`s for mail* in the master-database

(*) use this patch.

 

@florian030, thank you, this is an interesting new approach.
I will give this a run, and try to document as I go for others who might be in the same position.
Many thanks!
Geoff.

 

@florian030:

I assume I should do that in ISPConfig? However I'm not sure how to get SYSTEM1 to mirror mail only. SYSTEM1 currently runs many other services, and has active sites.
In the interface, I have these options:

It seems like mirroring can be either on or off. Reading through the manual it seems it would be active for all the selected services. Is there is a way to continue to run the other services, while still mirroring email?
Thanks
Geoff.

 

Thanks Till. Something has come up, so I probably won't get to this for a couple of weeks, but when I do I will post my results here.
Cheers
Geoff.