90 lines
3.2 KiB
Plaintext
90 lines
3.2 KiB
Plaintext
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[Code contributed by Scott Cotton and Joshua Marcus, IC Group, Inc.]
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We've written code to add a mysql map type. It utilizes the mysql
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client library, which can be obtained from:
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http://www.tcx.se/download.html
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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:
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make -f Makefile.init makefiles \
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'CCARGS=-DHAS_MYSQL -I/some/where/include/mysql' \
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'AUXLIBS=/some/where/lib/mysql/libmysqlclient.a -lm'
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then, just run 'make'.
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Postfix installations which may benefit from using mysql map types
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include sites that have a need for instantaneous updates of
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forwarding, and sites that may benefit from having mail exchangers
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reference a networked database, possibly working in conjunction with a
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customer database of sorts.
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Once postfix is built with mysql support, you can specify a map type
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in main.cf like this:
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alias_maps = mysql:/etc/postfix/mysql-aliases.cf
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The file /etc/postfix/mysql-aliases.cf specifies lots of information
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telling postfix how to reference the mysql database. An example mysql
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map config file follows:
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#
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# mysql config file for alias lookups on postfix
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# comments are ok.
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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_passwordd
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# the database name on the servers
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dbname = customer_database
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# the table name
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table = mxaliases
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#
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select_field = forw_addr
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where_field = alias
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# you may specify additional_conditions here
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additional_conditions = and status = 'paid'
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# the above variables will result in a query of
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# the form:
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# select forw_addr from mxaliases where alias = '$lookup' and status = 'paid'
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# ($lookup is escaped so if it contains single quotes or other odd
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# characters, it will not cause a parse error in the sql).
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#
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# the hosts that postfix will try to connect to
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# and query from (in the order listed)
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hosts = host1.some.domain host2.some.domain
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# end mysql config file
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Some notes:
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This configuration interface setup allows for multiple mysql
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databases: you can use one for a virtual table, one for an access
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table, and one for an aliases table if you want.
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Since sites that have a need for multiple mail exchangers may enjoy
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the convenience of using a networked mailer database, but do not want
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to introduce a single point of failure to their system, we've included
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the ability to have postfix reference multiple hosts for access to a
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single mysql map. This will work if sites set up mirrored mysql
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databases on two or more hosts. Whenever queries fail with an error
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at one host, the rest of the hosts will be tried in order. Each host
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that is in an error state will undergo a reconnection attempt every so
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often, and if no mysql server hosts are reachable, then mail will be
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deferred until atleast one of those hosts is reachable.
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Performance of postfix with mysql has not been thoroughly tested,
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however, we have found it to be stable. Busy mail servers using mysql
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maps will generate lots of concurrent mysql clients, so the mysql
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server(s) should be run with this fact in mind. Any further
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performance information, in addition to any feedback is most welcome.
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