December 2003
Beginner
278 pages
10h 47m
English
Content preview from Postfix: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 15. External Databases
Postfix map files provide an easy and efficient mechanism for the many lookup operations needed when handling email. In some situations, however, it can be more convenient to have the information in a database separate from Postfix. A database can provide a central repository available to many system or network services that need similar information, such as account names and passwords. A database can be useful when redundant systems running Postfix need to share the same configuration information. A central database might also be more convenient when you have multiple people who need access to edit information.
Databases can also slow Postfix performance compared to normal index files. In general, if you don’t have a definite need for a database, you’re better off with the standard Postfix maps. In many cases you can get the best of both options by storing information in a database and running regular scripts that update your Postfix files from the central data repository. But if your environment requires instant access to revised data, an external database configuration may be your only option.
In this chapter, we’ll look at configuring Postfix to work with
MySQL and LDAP. (Postfix also has support for PostgreSQL as of Version
2.1.) In either case, Postfix must be compiled with additional libraries
to support the mysql and ldap map types. If you are using a prebuilt package, make sure that it has support for the type of database you plan to use. If ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.