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List:       postfix-users
Subject:    [pfx] Re: Difference between alias_maps and alias_database
From:       Wietse Venema via Postfix-users <postfix-users () postfix ! org>
Date:       2024-05-07 16:35:52
Message-ID: 20240507163552.GA46290 () spike ! porcupine ! org
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On Tue, May 07, 2024 at 05:47:59PM +0200, Matus UHLAR - fantomas via Postfix-users wrote:
> On 07.05.24 17:13, Дилян Палаузов via Postfix-users wrote:
> >I try to understand the difference between alias_database and alias_maps.
> 
> >Or, does postalias/newaliases use is alias_database as input, ignoring 
> >alias_maps, while local ignores alias_databases and uses alias_maps?
> 
> Precisely. 
> 
> alias_maps is for local(8) to know which database(s) to read.
> They don't need to be writable (e.g.  nis:mail.aliases)

Only "newaliases" knows what "alias_database" is.  By default,
"newaliases" invokes "postalias" with a list of databases specified
in "alias_database".

	Wietse

> alias_database is for newaliases/postalias to know which database to 
> reindex.
> 
> ...because not all databases in aliases can be indexed by postfix programs.
> 
> >when the same table is supposed to be used by local and postaliases, the 
> >same value (filename) must be set to alias_database and alias_maps?
> 
> If you want postfix to work properly, yes.
> 
> >I think it would be better to have only one parameter: alias_maps, and 
> >newaliases should either update, what is pointed to by alias_maps, or 
> 
> This may not be possible for NIS maps, LDAP maps etc etc.
> That's why there are separate parameters.
> 
> >report an error on failure.  In any case the presence of the two options 
> >currently suggests that there are use cases to have for both options two 
> >different local files as value and the documentation does not elaborate 
> >whether this is a good or bad idea.
> 
> perhaps the default value for alias_maps could be something like:
> 
> alias_maps = $alias_database, nis:mail.aliases
> 
> But the rest still applies.
> 
> -- 
> Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
> Warning: I wish NOT to receive e-mail advertising to this address.
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