180 lines
9.1 KiB
HTML
180 lines
9.1 KiB
HTML
<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
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"https://www.w3.org/TR/html4/loose.dtd">
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<html> <head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link rel='stylesheet' type='text/css' href='postfix-doc.css'>
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<title> Postfix manual - flush(8) </title>
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</head> <body> <pre>
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FLUSH(8) FLUSH(8)
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<b><a name="name">NAME</a></b>
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flush - Postfix fast flush server
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<b><a name="synopsis">SYNOPSIS</a></b>
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<b>flush</b> [generic Postfix daemon options]
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<b><a name="description">DESCRIPTION</a></b>
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The <a href="flush.8.html"><b>flush</b>(8)</a> server maintains a record of deferred mail by destination.
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This information is used to improve the performance of the SMTP <b>ETRN</b>
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request, and of its command-line equivalent, "<b>sendmail -qR</b>" or
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"<b>postqueue -f</b>". This program expects to be run from the <a href="master.8.html"><b>master</b>(8)</a>
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process manager.
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The record is implemented as a per-destination logfile with as contents
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the queue IDs of deferred mail. A logfile is append-only, and is trun-
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cated when delivery is requested for the corresponding destination. A
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destination is the part on the right-hand side of the right-most <b>@</b> in
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an email address.
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Per-destination logfiles of deferred mail are maintained only for eli-
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gible destinations. The list of eligible destinations is specified with
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the <b><a href="postconf.5.html#fast_flush_domains">fast_flush_domains</a></b> configuration parameter, which defaults to
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<b>$<a href="postconf.5.html#relay_domains">relay_domains</a></b>.
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This server implements the following requests:
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<b>add</b> <i>sitename queueid</i>
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Inform the <a href="flush.8.html"><b>flush</b>(8)</a> server that the message with the specified
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queue ID is queued for the specified destination.
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<b>send_site</b> <i>sitename</i>
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Request delivery of mail that is queued for the specified desti-
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nation.
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<b>send_file</b> <i>queueid</i>
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Request delivery of the specified deferred message.
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<b>refresh</b>
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Refresh non-empty per-destination logfiles that were not read in
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<b>$<a href="postconf.5.html#fast_flush_refresh_time">fast_flush_refresh_time</a></b> hours, by simulating send requests (see
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above) for the corresponding destinations.
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Delete empty per-destination logfiles that were not updated in
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<b>$<a href="postconf.5.html#fast_flush_purge_time">fast_flush_purge_time</a></b> days.
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This request completes in the background.
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<b>purge</b> Do a <b>refresh</b> for all per-destination logfiles.
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<b><a name="security">SECURITY</a></b>
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The <a href="flush.8.html"><b>flush</b>(8)</a> server is not security-sensitive. It does not talk to the
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network, and it does not talk to local users. The fast flush server
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can run chrooted at fixed low privilege.
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<b><a name="diagnostics">DIAGNOSTICS</a></b>
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Problems and transactions are logged to <b>syslogd</b>(8) or <a href="postlogd.8.html"><b>postlogd</b>(8)</a>.
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<b><a name="bugs">BUGS</a></b>
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Fast flush logfiles are truncated only after a "send" request, not when
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mail is actually delivered, and therefore can accumulate outdated or
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redundant data. In order to maintain sanity, "refresh" must be executed
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periodically. This can be automated with a suitable wakeup timer set-
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ting in the <a href="master.5.html"><b>master.cf</b></a> configuration file.
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Upon receipt of a request to deliver mail for an eligible destination,
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the <a href="flush.8.html"><b>flush</b>(8)</a> server requests delivery of all messages that are listed
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in that destination's logfile, regardless of the recipients of those
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messages. This is not an issue for mail that is sent to a <b><a href="postconf.5.html#relay_domains">relay_domains</a></b>
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destination because such mail typically only has recipients in one
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domain.
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<b><a name="configuration_parameters">CONFIGURATION PARAMETERS</a></b>
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Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically as <a href="flush.8.html"><b>flush</b>(8)</a> processes
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run for only a limited amount of time. Use the command "<b>postfix reload</b>"
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to speed up a change.
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The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for
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more details including examples.
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<b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
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The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
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figuration files.
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<b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b>
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How much time a Postfix daemon process may take to handle a
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request before it is terminated by a built-in watchdog timer.
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<b><a href="postconf.5.html#fast_flush_domains">fast_flush_domains</a> ($<a href="postconf.5.html#relay_domains">relay_domains</a>)</b>
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Optional list of destinations that are eligible for per-destina-
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tion logfiles with mail that is queued to those destinations.
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<b><a href="postconf.5.html#fast_flush_refresh_time">fast_flush_refresh_time</a> (12h)</b>
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The time after which a non-empty but unread per-destination
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"fast flush" logfile needs to be refreshed.
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<b><a href="postconf.5.html#fast_flush_purge_time">fast_flush_purge_time</a> (7d)</b>
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The time after which an empty per-destination "fast flush" log-
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file is deleted.
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<b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b>
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The time limit for sending or receiving information over an
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internal communication channel.
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<b><a href="postconf.5.html#max_idle">max_idle</a> (100s)</b>
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The maximum amount of time that an idle Postfix daemon process
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waits for an incoming connection before terminating voluntarily.
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<b><a href="postconf.5.html#max_use">max_use</a> (100)</b>
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The maximal number of incoming connections that a Postfix daemon
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process will service before terminating voluntarily.
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<b><a href="postconf.5.html#parent_domain_matches_subdomains">parent_domain_matches_subdomains</a> (see 'postconf -d' output)</b>
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A list of Postfix features where the pattern "example.com" also
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matches subdomains of example.com, instead of requiring an
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explicit ".example.com" pattern.
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<b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
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The process ID of a Postfix command or daemon process.
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<b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
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The process name of a Postfix command or daemon process.
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<b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b>
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The location of the Postfix top-level queue directory.
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<b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
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The syslog facility of Postfix logging.
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<b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
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A prefix that is prepended to the process name in syslog
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records, so that, for example, "smtpd" becomes "prefix/smtpd".
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Available in Postfix 3.3 and later:
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<b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b>
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The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process.
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<b><a name="files">FILES</a></b>
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/var/spool/postfix/flush, "fast flush" logfiles.
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<b><a name="see_also">SEE ALSO</a></b>
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<a href="smtpd.8.html">smtpd(8)</a>, SMTP server
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<a href="qmgr.8.html">qmgr(8)</a>, queue manager
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<a href="postconf.5.html">postconf(5)</a>, configuration parameters
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<a href="master.5.html">master(5)</a>, generic daemon options
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<a href="master.8.html">master(8)</a>, process manager
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<a href="postlogd.8.html">postlogd(8)</a>, Postfix logging
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syslogd(8), system logging
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<b><a name="readme_files">README FILES</a></b>
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<a href="ETRN_README.html">ETRN_README</a>, Postfix ETRN howto
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<b><a name="license">LICENSE</a></b>
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The Secure Mailer license must be distributed with this software.
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<b><a name="history">HISTORY</a></b>
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This service was introduced with Postfix version 1.0.
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<b>AUTHOR(S)</b>
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Wietse Venema
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IBM T.J. Watson Research
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P.O. Box 704
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Yorktown Heights, NY 10598, USA
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Wietse Venema
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Google, Inc.
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111 8th Avenue
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New York, NY 10011, USA
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FLUSH(8)
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</pre> </body> </html>
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