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<title>Postfix MySQL Howto</title>
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<h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix MySQL Howto</h1>
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<hr>
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<h2>Introduction</h2>
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<p> The Postfix mysql map type allows you to hook up Postfix to a
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MySQL database. This implementation allows for multiple mysql
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databases: you can use one for a virtual(5) table, one for an
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access(5) table, and one for an aliases(5) table if you want. You
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can specify multiple servers for the same database, so that Postfix
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can switch to a good database server if one goes bad. </p>
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<p> Busy mail servers using mysql maps will generate lots of
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concurrent mysql clients, so the mysql server(s) should be run with
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this fact in mind. You can reduce the number of concurrent mysql
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clients by using the Postfix proxymap(8) service. </p>
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<h2>Building Postfix with MySQL support</h2>
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<p> Note: to use mysql with Debian GNU/Linux's Postfix, all you
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need is to install the postfix-mysql package and you're done.
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There is no need to recompile Postfix. </p>
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<p> The Postfix MySQL client utilizes the mysql client library,
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which can be obtained from: </p>
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<blockquote>
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<p> http://www.mysql.com/downloads/ <br>
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http://sourceforge.net/projects/mysql/ </p>
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</blockquote>
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<p> In order to build Postfix with mysql map support, you will need to add
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-DHAS_MYSQL and -I for the directory containing the mysql headers, and
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the mysqlclient library (and libm) to AUXLIBS, for example: </p>
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<blockquote>
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<pre>
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make -f Makefile.init makefiles \
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'CCARGS=-DHAS_MYSQL -I/usr/local/mysql/include' \
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'AUXLIBS=-L/usr/local/mysql/lib -lmysqlclient -lz -lm'
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</pre>
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</blockquote>
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<p> Then, just run 'make'. This requires libz, the compression
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library. Older mysql implementations build without libz. </p>
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<h2>Using MySQL tables</h2>
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<p> Once Postfix is built with mysql support, you can specify a
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map type in main.cf like this: </p>
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<blockquote>
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<pre>
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alias_maps = mysql:/etc/postfix/mysql-aliases.cf
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</pre>
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</blockquote>
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<p> The file /etc/postfix/mysql-aliases.cf specifies lots of
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information telling Postfix how to reference the mysql database.
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For a complete description, see the mysql_table(5) manual page. </p>
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<h2>Example: local aliases </h2>
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<pre>
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#
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# mysql config file for local(8) aliases(5) lookups
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#
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# The user name and password to log into the mysql server.
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user = someone
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password = some_password
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# The database name on the servers.
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dbname = customer_database
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2005-08-19 01:00:20 +04:00
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# For Postfix 2.2 and later The SQL query template.
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# See mysql_table(5) for details.
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query = SELECT forw_addr FROM mxaliases WHERE alias='%s' AND status='paid'
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2005-08-19 01:00:20 +04:00
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# For Postfix releases prior to 2.2. See mysql_table(5) for details.
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2004-04-27 08:12:43 +04:00
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select_field = forw_addr
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table = mxaliases
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where_field = alias
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2005-08-19 01:00:20 +04:00
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# Don't forget the leading "AND"!
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additional_conditions = AND status = 'paid'
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2004-04-27 08:12:43 +04:00
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</pre>
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<h2>Additional notes</h2>
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<p> The MySQL configuration interface setup allows for multiple
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mysql databases: you can use one for a virtual table, one for an
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access table, and one for an aliases table if you want. </p>
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<p> Since sites that have a need for multiple mail exchangers may
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enjoy the convenience of using a networked mailer database, but do
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not want to introduce a single point of failure to their system,
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we've included the ability to have Postfix reference multiple hosts
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for access to a single mysql map. This will work if sites set up
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mirrored mysql databases on two or more hosts. Whenever queries
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fail with an error at one host, the rest of the hosts will be tried
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in random order. If no mysql server hosts are reachable, then mail
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will be deferred until at least one of those hosts is reachable.
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</p>
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<h2>Credits</h2>
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<ul>
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<li> The initial version was contributed by Scott Cotton and Joshua
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2005-08-19 01:00:20 +04:00
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Marcus, IC Group, Inc.</li>
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<li> Liviu Daia revised the configuration interface and added the
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main.cf configuration feature.</li>
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2004-04-27 08:12:43 +04:00
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2005-08-19 01:00:20 +04:00
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<li> Liviu Daia with further refinements from Jose Luis Tallon and
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Victor Duchovni developed the common query, result_format, domain and
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expansion_limit interface for LDAP, MySQL and PosgreSQL.</li>
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2004-04-27 08:12:43 +04:00
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</ul>
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</body>
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</html>
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