Eray Aslan:
> On Tue, Dec 19, 2017 at 10:53:38AM -0500, Wietse Venema wrote:
> > Postfix will bail out if it knows that the queue or data directory
> > are shared, because that can result in data corruption.
> > 
> > How do I enforce that constraint when directories are imported into
> > a container from the host?
> I don't think you can.  But how is that different from the current
> status quo?  We can only continue doing what we have been doing so far.

The status quo (prior to containers) is that Postfix prevents
unnecessary requests for support from people who do things like
sharing a queue_directory or data_directory.

The Postfix master relies on opening a 'lock' file below the queue
and data directories, and holding an exclusive lock until the process
terminates. If that works across container boundaries, then that
is one less thing to worry about. But all this is speculation until
it is proven to work.


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