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Zimbra to Carbonio – Z2C

This is it. After more than a decade I had to install a different E-mail/Collaboration server than Zimbra.

Carbonio from Zextras is a great tool and if it still have a loot to improve it’s ready to go in production and full fill most users needs to replace Zimbra as a popular E-mail server.

Don’t fool yourself, Carbonio is a lot different and have many extra components, but it’s core still is a Zimbra., meaning that most “zm” commands are available and also it’s 4 pillars mysql + openldap + postfix + jetty still are there. What Zextra did so far was add a new interface, libreoffice and a service networking solution called Consult to help to integrate it all. It’s a pretty damn good work.

After many test in controlled environment I finally migrated my first server to Carbonio and I took inspiration o a very handy tool done by Fábio Schidt called Z2Z to make this scripts to help migrate from Zimbra to Carbonio.

In the end I realized that processes were not so different and with just a few adjusts it could also be used to migrate from Zimbra to Carbonio and vice-versa, but also from Z2Z and Z2Z =)

You can download it here: Z2C


Z2C is a quite simple pair of scripts to export LDAP data from an origin Zimbra or Carbonio server and import it on a brand new Zimbra or Carbonio server. It’s goal is to migrate a

ccounts and help to dump and restore mailboxes from one server to another.

As simple as it is, there is no need for install anything. Just run the scripts:

1 – z2c.sh to export it all from the original server

2 – copy a Z2C folder to the new server

3 – fix it’s permission on the new server

4 – restore.sh to import it on the new server

Those steps will export users, aliases and lists from the one server and import it on the new one.


Once you have all domains, accounts, aliases and list imported on the new server it’s time to dump mailboxes on the original server, copy it to the new one and then retore it there


Z2C make it pretty easy for you, creating a full set of scripts:

script_export_FULL.sh   -> a list of zmmailbox commands to dump all mailboxes;

script_export_TRASH.sh  -> a list of zmmailbox commands to dump the Trash folder, because it’s not dumped on the regular command and some users can’t live without it’s Trash =)

script_import_FULL.sh   -> a list of zmmailbox commands to restore all mailboxes;

script_import_TRASH.sh  -> a list of zmmailbox commands to restore the Trash folder, because it’s not restored on the regular command and some users can’t live without it’s Trash =


script_import_quota.txt -> a list of zmprov commands to restore all accounts quotas if you need it;

users.txt               -> just a list of users to make it at hand in case you want to script anything #nerdfellings


You may consider to install and run those scripts using parallel to make dumps and restores faster.

Those script are great but it may take quite a long time to run it if you have hundreds or thousands of accounts, so be able to run many at the same time in a non stop way it’s faster, by far.

Just take care to don’t do too many at the same time, your server may not be able to deal with the overload. We suggest you to use between 3 and 5 simultaneously dumps/restore, but

feel free to test it out.

This is how you use it:

parallel -j4 < script 

j4 -> where 4 is the number of processes it will run at the same time;
script -> the name of that file with the list of commands you wanna it to process


Sometimes zmmailbox aborts processing with a “timeout” error despite the fact we’re using “-t0” flag option.
The workaround is change socket_so_timeout option to a very high time before start importing those mailboxes dumps and restore it’s default value when it’s over. So here you
have it:

zmlocalconfig -e socket_so_timeout=99999999
zmlocalconfig --reload

Then import it all

To restore default values do:

zmlocalconfig -e socket_so_timeout=30000
zmlocalconfig --reload

Whish it helps!

Read the original post on anahuac
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