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+<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
+<html> <head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title> Postfix manual - memcache_table(5) </title>
+</head> <body> <pre>
+MEMCACHE_TABLE(5) MEMCACHE_TABLE(5)
+
+<b>NAME</b>
+ memcache_table - Postfix memcache client configuration
+
+<b>SYNOPSIS</b>
+ <b>postmap -q "</b><i>string</i><b>" <a href="memcache_table.5.html">memcache</a>:/etc/postfix/</b><i>filename</i>
+
+ <b>postmap -q - <a href="memcache_table.5.html">memcache</a>:/etc/postfix/</b><i>filename</i> &lt;<i>inputfile</i>
+
+<b>DESCRIPTION</b>
+ The Postfix mail system uses optional tables for address rewriting or
+ mail routing. These tables are usually in <b>dbm</b> or <b>db</b> format.
+
+ Alternatively, lookup tables can be specified as memcache instances.
+ To use memcache lookups, define a memcache source as a lookup table in
+ <a href="postconf.5.html">main.cf</a>, for example:
+
+ <a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a> = <a href="memcache_table.5.html">memcache</a>:/etc/postfix/memcache-aliases.cf
+
+ The file /etc/postfix/memcache-aliases.cf has the same format as the
+ Postfix <a href="postconf.5.html">main.cf</a> file, and specifies the parameters described below.
+
+ The Postfix memcache client supports the lookup, update, delete and
+ sequence (first/next) operations. The sequence operation requires a
+ backup database that supports the operation.
+
+<b>MEMCACHE MAIN PARAMETERS</b>
+ <b>memcache (default: inet:localhost:11211)</b>
+ The memcache server (note: singular) that Postfix will try to
+ connect to. For a TCP server specify "inet:" followed by a
+ hostname or address, ":", and a port name or number. Specify an
+ IPv6 address inside "[]". For a UNIX-domain server specify
+ "unix:" followed by the socket pathname. Examples:
+
+ memcache = inet:memcache.example.com:11211
+ memcache = inet:127.0.0.1:11211
+ memcache = inet:[fc00:8d00:189::3]:11211
+ memcache = unix:/path/to/socket
+
+ NOTE: to access a UNIX-domain socket with the <a href="proxymap.8.html">proxymap(8)</a>
+ server, the socket must be accessible by the unprivileged post-
+ fix user.
+
+ <b>backup (default: undefined)</b>
+ An optional Postfix database that provides persistent backup for
+ the memcache database. The Postfix memcache client will update
+ the memcache database whenever it looks up or changes informa-
+ tion in the persistent database. Specify a Postfix "<a href="DATABASE_README.html">type:table</a>"
+ database. Examples:
+
+ # Non-shared postscreen cache.
+ backup = <a href="DATABASE_README.html#types">btree</a>:/var/lib/postfix/<a href="postconf.5.html#postscreen_cache_map">postscreen_cache_map</a>
+
+ # Shared postscreen cache for processes on the same host.
+ backup = <a href="proxymap.8.html">proxy</a>:<a href="DATABASE_README.html#types">btree</a>:/var/lib/postfix/<a href="postconf.5.html#postscreen_cache_map">postscreen_cache_map</a>
+
+ Access to remote proxymap servers is under development.
+
+ NOTE 1: When sharing a persistent <a href="postscreen.8.html"><b>postscreen</b>(8)</a> or <a href="verify.8.html"><b>verify</b>(8)</a>
+ cache, disable automatic cache cleanup (set
+ *_cache_cleanup_interval = 0) except with one Postfix instance
+ that will be responsible for cache cleanup.
+
+ NOTE 2: When multiple tables share the same memcache database,
+ each table should use the <b>key_format</b> feature (see below) to
+ prepend its own unique string to the lookup key. Otherwise,
+ automatic <a href="postscreen.8.html"><b>postscreen</b>(8)</a> or <a href="verify.8.html"><b>verify</b>(8)</a> cache cleanup may not work.
+
+ NOTE 3: When the backup database is accessed with "<a href="proxymap.8.html">proxy</a>:"
+ lookups, the full backup database name (including the "<a href="proxymap.8.html">proxy</a>:"
+ prefix) must be specified in the proxymap server's
+ <a href="postconf.5.html#proxy_read_maps">proxy_read_maps</a> or <a href="postconf.5.html#proxy_write_maps">proxy_write_maps</a> setting (depending on
+ whether the access is read-only or read-write).
+
+ <b>flags (default: 0)</b>
+ Optional flags that should be stored along with a memcache
+ update. The flags are ignored when looking up information.
+
+ <b>ttl (default: 3600)</b>
+ The expiration time in seconds of memcache updates.
+
+ NOTE 1: When using a memcache table as <a href="postscreen.8.html"><b>postscreen</b>(8)</a> or <a href="verify.8.html"><b>ver-</b></a>
+ <a href="verify.8.html"><b>ify</b>(8)</a> cache without persistent backup, specify a zero
+ *_cache_cleanup_interval value with all Postfix instances that
+ use the memcache, and specify the largest <a href="postscreen.8.html"><b>postscreen</b>(8)</a> *_ttl
+ value or <a href="verify.8.html"><b>verify</b>(8)</a> *_expire_time value as the memcache table's
+ <b>ttl</b> value.
+
+ NOTE 2: According to memcache protocol documentation, a value
+ greater than 30 days (2592000 seconds) specifies absolute UNIX
+ time. Smaller values are relative to the time of the update.
+
+<b>MEMCACHE KEY PARAMETERS</b>
+ <b>key_format (default: %s)</b>
+ Format of the lookup and update keys that the Postfix memcache
+ client sends to the memcache server. By default, these are the
+ same as the lookup and update keys that the memcache client
+ receives from Postfix applications.
+
+ NOTE 1: The <b>key_format</b> feature is not used for <b>backup</b> database
+ requests.
+
+ NOTE 2: When multiple tables share the same memcache database,
+ each table should prepend its own unique string to the lookup
+ key. Otherwise, automatic <a href="postscreen.8.html"><b>postscreen</b>(8)</a> or <a href="verify.8.html"><b>verify</b>(8)</a> cache
+ cleanup may not work.
+
+ Examples:
+
+ key_format = aliases:%s
+ key_format = verify:%s
+ key_format = postscreen:%s
+
+ The <b>key_format</b> parameter supports the following '%' expansions:
+
+ <b>%%</b> This is replaced by a literal '%' character.
+
+ <b>%s</b> This is replaced by the memcache client input key.
+
+ <b>%u</b> When the input key is an address of the form user@domain,
+ <b>%u</b> is replaced by the SQL quoted local part of the
+ address. Otherwise, <b>%u</b> is replaced by the entire search
+ string. If the localpart is empty, a lookup is silently
+ suppressed and returns no results (an update is skipped
+ with a warning).
+
+ <b>%d</b> When the input key is an address of the form user@domain,
+ <b>%d</b> is replaced by the domain part of the address. Other-
+ wise, a lookup is silently suppressed and returns no
+ results (an update is skipped with a warning).
+
+ <b>%[SUD]</b> The upper-case equivalents of the above expansions behave
+ in the <b>key_format</b> parameter identically to their
+ lower-case counter-parts.
+
+ <b>%[1-9]</b> The patterns %1, %2, ... %9 are replaced by the corre-
+ sponding most significant component of the input key's
+ domain. If the input key is <i>user@mail.example.com</i>, then
+ %1 is <b>com</b>, %2 is <b>example</b> and %3 is <b>mail</b>. If the input key
+ is unqualified or does not have enough domain components
+ to satisfy all the specified patterns, a lookup is
+ silently suppressed and returns no results (an update is
+ skipped with a warning).
+
+ <b>domain (default: no domain list)</b>
+ This feature can significantly reduce database server load.
+ Specify a list of domain names, paths to files, or "<a href="DATABASE_README.html">type:table</a>"
+ databases. When specified, only fully qualified search keys
+ with a *non-empty* localpart and a matching domain are eligible
+ for lookup or update: bare 'user' lookups, bare domain lookups
+ and "@domain" lookups are silently skipped (updates are skipped
+ with a warning). Example:
+
+ domain = example.com, <a href="DATABASE_README.html#types">hash</a>:/etc/postfix/searchdomains
+
+<b>MEMCACHE ERROR CONTROLS</b>
+ <b>data_size_limit (default: 10240)</b>
+ The maximal memcache reply data length in bytes.
+
+ <b>line_size_limit (default: 1024)</b>
+ The maximal memcache reply line length in bytes.
+
+ <b>max_try (default: 2)</b>
+ The number of times to try a memcache command before giving up.
+ The memcache client does not retry a command when the memcache
+ server accepts no connection.
+
+ <b>retry_pause (default: 1)</b>
+ The time in seconds before retrying a failed memcache command.
+
+ <b>timeout (default: 2)</b>
+ The time limit for sending a memcache command and for receiving
+ a memcache reply.
+
+<b>BUGS</b>
+ The Postfix memcache client cannot be used for security-sensitive
+ tables such as <b><a href="postconf.5.html#alias_maps">alias_maps</a></b> (these may contain "<i>|command</i> and "<i>/file/name</i>"
+ destinations), or <b><a href="postconf.5.html#virtual_uid_maps">virtual_uid_maps</a></b>, <b><a href="postconf.5.html#virtual_gid_maps">virtual_gid_maps</a></b> and <b><a href="postconf.5.html#virtual_mailbox_maps">virtual_mail</a>-</b>
+ <b><a href="postconf.5.html#virtual_mailbox_maps">box_maps</a></b> (these specify UNIX process privileges or "<i>/file/name</i>" desti-
+ nations). In a typical deployment a memcache database is writable by
+ any process that can talk to the memcache server; in contrast, secu-
+ rity-sensitive tables must never be writable by the unprivileged Post-
+ fix user.
+
+ The Postfix memcache client requires additional configuration when used
+ as <a href="postscreen.8.html"><b>postscreen</b>(8)</a> or <a href="verify.8.html"><b>verify</b>(8)</a> cache. For details see the <b>backup</b> and
+ <b>ttl</b> parameter discussions in the MEMCACHE MAIN PARAMETERS section
+ above.
+
+<b>SEE ALSO</b>
+ <a href="postmap.1.html">postmap(1)</a>, Postfix lookup table manager
+ <a href="postconf.5.html">postconf(5)</a>, configuration parameters
+
+<b>README FILES</b>
+ <a href="DATABASE_README.html">DATABASE_README</a>, Postfix lookup table overview
+ <a href="MEMCACHE_README.html">MEMCACHE_README</a>, Postfix memcache client guide
+
+<b>LICENSE</b>
+ The Secure Mailer license must be distributed with this software.
+
+<b>HISTORY</b>
+ Memcache support was introduced with Postfix version 2.9.
+
+<b>AUTHOR(S)</b>
+ Wietse Venema
+ IBM T.J. Watson Research
+ P.O. Box 704
+ Yorktown Heights, NY 10598, USA
+
+ Wietse Venema
+ Google, Inc.
+ 111 8th Avenue
+ New York, NY 10011, USA
+
+ MEMCACHE_TABLE(5)
+</pre> </body> </html>