Michael Tokarev via Postfix-users:
> On 27.02.2026 23:37, Wietse Venema via Postfix-users wrote:
> > postfix-3.11.0-RC4 and postfix-3.12-20260227 come with support
> > to ease the migration:
>
> > - Of Postfix configurations that use Berkeley DB hash: and btree:
> > databases,
> >
> > - To OS distributions that have deleted Berkeley DB support.
> >
> > The support comes in three levels:
> >
> > - Manual conversion (edit configuration files, replace hash; with
> > lmdb: or cdb:, run 'postmap' commands). This may be OK if you
> > recently configured a Postfix system. Otherwise, consider using:
> >
> > - Automatic redirection (a request to read hash:/path/to/file
> > is implicitly handled as a request to read lmdb:/path/to/file).
> > Postfix will log requests to manually do 'postmap lmdb:/path/to/file'
> > to create the missing indexed files before they can be read.
> >
> > - Automatic redirection and indexing (Postfix redirects a request
> > to read hash:/path/to/file to lmdb:/path/to/file, and tries to
> > 'postmap lmdb:/path/to/file' before it satisfies a read request).
>
> This is excellent really. Simple and efficient.
>
> I think I missed one more state: warn.
>
> The idea is to have it enabled by default while bdb support is
> still here, - so that a warning is issued when hash/btree is in
> use, but it is used still?
In today's -RC5 I am adding logging for the case that 'redirect'
is enabled, but not for the non-redirect case. I have to stop adding
code.
> Actually this can be easily added as a patch for a distribution,
> so there's no need to carry it upstream, - for a temporary code.
For me, temporary means 4-5 years. Then, most of the migration
support should be removed.
> I'm not sure yet if the next debian stable release (14, forky)
> will have bdb support or not, - in my view it is not an easy task
> to fix before forky release to get rid of berkeley db. But if
> bdb will be there, a warning is the best we can do.
>
> I'll have a closer look at the result in a few days - unfortunately
> I didn't have a chance to do that earlier.
>
> Excellent news!
Thanks!
Wietse
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