Migrate system users to virtual users
ronleach at tesco.net
Thu Nov 13 18:29:42 UTC 2014
List, good afternoon,
We are at the planning stage of wanting to migrate from an existing
installation onto a new machine, and also to change from system users
to virtual users. May I check that our ideas for user id are correct?
I am not sure whether we will encounter a 'permissions' and 'user id'
problem when moving from a system-user scheme to a virtual scheme. We
use Maildir, and the maildirs at the moment are in their users' linux
After reading the wiki, we think that the 'single system user for
vmail' arrangement, ie just one system user to manage all the mail for
all virtual users, will work for us. I think that means that the
permissions on all our existing 'system-user-oriented' maildirs will
have to be changed (in the new machine) so that they are owned by the
'single-system-user', such as 'vmail'.
One thought was to first copy the existing maildirs into the new
virtual user file system tree, and then, second, change the owners and
permissions on the maildirs and directories and messages to permit
control by 'vmail'. From the point of view of transferring all the
mail files, is that all we would have to do? (Of course, we would
also have to create the virtual users and their passwords, and arrange
the appropriate password lookups etc, but that's not the direct topic
of this post. And that arrangement has to be compatible with the MTA,
If we do copy the maildirs and change the permissions, does all the
metadata that the clients, or Dovecot, use to detect new, existing, or
downloaded mail remain valid? Or should we use a different approach?
Grateful for any comment
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