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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:18:56 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:18:56 +0000
commitb7c15c31519dc44c1f691e0466badd556ffe9423 (patch)
treef944572f288bab482a615e09af627d9a2b6727d8 /proto/memcache_table
parentInitial commit. (diff)
downloadpostfix-b7c15c31519dc44c1f691e0466badd556ffe9423.tar.xz
postfix-b7c15c31519dc44c1f691e0466badd556ffe9423.zip
Adding upstream version 3.7.10.upstream/3.7.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+#++
+# NAME
+# memcache_table 5
+# SUMMARY
+# Postfix memcache client configuration
+# SYNOPSIS
+# \fBpostmap -q "\fIstring\fB" memcache:/etc/postfix/\fIfilename\fR
+#
+# \fBpostmap -q - memcache:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
+# DESCRIPTION
+# The Postfix mail system uses optional tables for address
+# rewriting or mail routing. These tables are usually in
+# \fBdbm\fR or \fBdb\fR format.
+#
+# Alternatively, lookup tables can be specified as memcache
+# instances. To use memcache lookups, define a memcache
+# source as a lookup table in main.cf, for example:
+#
+# .nf
+# virtual_alias_maps = memcache:/etc/postfix/memcache-aliases.cf
+# .fi
+#
+# The file /etc/postfix/memcache-aliases.cf has the same
+# format as the Postfix main.cf 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.
+# MEMCACHE MAIN PARAMETERS
+# .ad
+# .fi
+# .IP "\fBmemcache (default: inet:localhost:11211)\fR"
+# 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:
+#
+# .nf
+# 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
+# .fi
+#
+# NOTE: to access a UNIX-domain socket with the proxymap(8)
+# server, the socket must be accessible by the unprivileged
+# postfix user.
+# .IP "\fBbackup (default: undefined)\fR"
+# 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
+# information in the persistent database. Specify a Postfix
+# "type:table" database. Examples:
+#
+# .nf
+# # Non-shared postscreen cache.
+# backup = btree:/var/lib/postfix/postscreen_cache_map
+#
+# # Shared postscreen cache for processes on the same host.
+# backup = proxy:btree:/var/lib/postfix/postscreen_cache_map
+# .fi
+#
+# Access to remote proxymap servers is under development.
+#
+# NOTE 1: When sharing a persistent \fBpostscreen\fR(8) or
+# \fBverify\fR(8) 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 \fBkey_format\fR feature
+# (see below) to prepend its own unique string to the lookup
+# key. Otherwise, automatic \fBpostscreen\fR(8) or \fBverify\fR(8)
+# cache cleanup may not work.
+#
+# NOTE 3: When the backup database is accessed with "proxy:"
+# lookups, the full backup database name (including the
+# "proxy:" prefix) must be specified in the proxymap server's
+# proxy_read_maps or proxy_write_maps setting (depending on
+# whether the access is read-only or read-write).
+# .IP "\fBflags (default: 0)\fR"
+# Optional flags that should be stored along with a memcache
+# update. The flags are ignored when looking up information.
+# .IP "\fBttl (default: 3600)\fR"
+# The expiration time in seconds of memcache updates.
+#
+# NOTE 1: When using a memcache table as \fBpostscreen\fR(8)
+# or \fBverify\fR(8) cache without persistent backup, specify
+# a zero *_cache_cleanup_interval value with all Postfix
+# instances that use the memcache, and specify the largest
+# \fBpostscreen\fR(8) *_ttl value or \fBverify\fR(8) *_expire_time
+# value as the memcache table's \fBttl\fR 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.
+# MEMCACHE KEY PARAMETERS
+# .ad
+# .fi
+# .IP "\fBkey_format (default: %s)\fB"
+# 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 \fBkey_format\fR feature is not used for \fBbackup\fR
+# 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 \fBpostscreen\fR(8)
+# or \fBverify\fR(8) cache cleanup may not work.
+#
+# Examples:
+#
+# .nf
+# key_format = aliases:%s
+# key_format = verify:%s
+# key_format = postscreen:%s
+# .fi
+#
+# The \fBkey_format\fR parameter supports the following '%'
+# expansions:
+# .RS
+# .IP "\fB%%\fR"
+# This is replaced by a literal '%' character.
+# .IP "\fB%s\fR"
+# This is replaced by the memcache client input key.
+# .IP "\fB%u\fR"
+# When the input key is an address of the form user@domain,
+# \fB%u\fR is replaced by the SQL quoted local part of the
+# address. Otherwise, \fB%u\fR 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).
+# .IP "\fB%d\fR"
+# When the input key is an address of the form user@domain,
+# \fB%d\fR is replaced by the domain part of the address.
+# Otherwise, a lookup is silently suppressed and returns no
+# results (an update is skipped with a warning).
+# .IP "\fB%[SUD]\fR"
+# The upper-case equivalents of the above expansions behave
+# in the \fBkey_format\fR parameter identically to their
+# lower-case counter-parts.
+# .IP "\fB%[1-9]\fR"
+# The patterns %1, %2, ... %9 are replaced by the corresponding
+# most significant component of the input key's domain. If
+# the input key is \fIuser@mail.example.com\fR, then %1 is
+# \fBcom\fR, %2 is \fBexample\fR and %3 is \fBmail\fR. 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).
+# .RE
+# .IP "\fBdomain (default: no domain list)\fR"
+# This feature can significantly reduce database server load.
+# Specify a list of domain names, paths to files, or "type:table"
+# 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:
+#
+# .nf
+# domain = example.com, hash:/etc/postfix/searchdomains
+# .fi
+# MEMCACHE ERROR CONTROLS
+# .ad
+# .fi
+# .IP "\fBdata_size_limit (default: 10240)\fR"
+# The maximal memcache reply data length in bytes.
+# .IP "\fBline_size_limit (default: 1024)\fR"
+# The maximal memcache reply line length in bytes.
+# .IP "\fBmax_try (default: 2)\fR"
+# 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.
+# .IP "\fBretry_pause (default: 1)\fR"
+# The time in seconds before retrying a failed memcache command.
+# .IP "\fBtimeout (default: 2)\fR"
+# The time limit for sending a memcache command and for
+# receiving a memcache reply.
+# BUGS
+# The Postfix memcache client cannot be used for security-sensitive
+# tables such as \fBalias_maps\fR (these may contain
+# "\fI|command\fR and "\fI/file/name\fR" destinations), or
+# \fBvirtual_uid_maps\fR, \fBvirtual_gid_maps\fR and
+# \fBvirtual_mailbox_maps\fR (these specify UNIX process
+# privileges or "\fI/file/name\fR" destinations). In a typical
+# deployment a memcache database is writable by any process
+# that can talk to the memcache server; in contrast,
+# security-sensitive tables must never be writable by the
+# unprivileged Postfix user.
+#
+# The Postfix memcache client requires additional configuration
+# when used as \fBpostscreen\fR(8) or \fBverify\fR(8) cache.
+# For details see the \fBbackup\fR and \fBttl\fR parameter
+# discussions in the MEMCACHE MAIN PARAMETERS section above.
+# SEE ALSO
+# postmap(1), Postfix lookup table manager
+# postconf(5), configuration parameters
+# README FILES
+# .ad
+# .fi
+# Use "\fBpostconf readme_directory\fR" or
+# "\fBpostconf html_directory\fR" to locate this information.
+# .na
+# .nf
+# DATABASE_README, Postfix lookup table overview
+# MEMCACHE_README, Postfix memcache client guide
+# LICENSE
+# .ad
+# .fi
+# The Secure Mailer license must be distributed with this software.
+# HISTORY
+# .ad
+# .fi
+# Memcache support was introduced with Postfix version 2.9.
+# AUTHOR(S)
+# 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
+#--