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| -rw-r--r-- | man/man8/flush.8 | 183 |
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diff --git a/man/man8/flush.8 b/man/man8/flush.8 new file mode 100644 index 0000000..b1fdf05 --- /dev/null +++ b/man/man8/flush.8 @@ -0,0 +1,183 @@ +.TH FLUSH 8 +.ad +.fi +.SH NAME +flush +\- +Postfix fast flush server +.SH "SYNOPSIS" +.na +.nf +\fBflush\fR [generic Postfix daemon options] +.SH DESCRIPTION +.ad +.fi +The \fBflush\fR(8) server maintains a record of deferred +mail by destination. +This information is used to improve the performance of the SMTP +\fBETRN\fR request, and of its command\-line equivalent, +"\fBsendmail \-qR\fR" or "\fBpostqueue \-f\fR". +This program expects to be run from the \fBmaster\fR(8) process +manager. + +The record is implemented as a per\-destination logfile with +as contents the queue IDs of deferred mail. A logfile is +append\-only, and is truncated when delivery is requested +for the corresponding destination. A destination is the +part on the right\-hand side of the right\-most \fB@\fR in +an email address. + +Per\-destination logfiles of deferred mail are maintained only for +eligible destinations. The list of eligible destinations is +specified with the \fBfast_flush_domains\fR configuration parameter, +which defaults to \fB$relay_domains\fR. + +This server implements the following requests: +.IP "\fBadd\fI sitename queueid\fR" +Inform the \fBflush\fR(8) server that the message with the specified +queue ID is queued for the specified destination. +.IP "\fBsend_site\fI sitename\fR" +Request delivery of mail that is queued for the specified +destination. +.IP "\fBsend_file\fI queueid\fR" +Request delivery of the specified deferred message. +.IP \fBrefresh\fR +Refresh non\-empty per\-destination logfiles that were not read in +\fB$fast_flush_refresh_time\fR hours, by simulating +send requests (see above) for the corresponding destinations. +.sp +Delete empty per\-destination logfiles that were not updated in +\fB$fast_flush_purge_time\fR days. +.sp +This request completes in the background. +.IP \fBpurge\fR +Do a \fBrefresh\fR for all per\-destination logfiles. +.SH "SECURITY" +.na +.nf +.ad +.fi +The \fBflush\fR(8) server is not security\-sensitive. It does not +talk to the network, and it does not talk to local users. +The fast flush server can run chrooted at fixed low privilege. +.SH DIAGNOSTICS +.ad +.fi +Problems and transactions are logged to \fBsyslogd\fR(8) +or \fBpostlogd\fR(8). +.SH BUGS +.ad +.fi +Fast flush logfiles are truncated only after a "send" +request, not when mail is actually delivered, and therefore can +accumulate outdated or redundant data. In order to maintain sanity, +"refresh" must be executed periodically. This can +be automated with a suitable wakeup timer setting in the +\fBmaster.cf\fR configuration file. + +Upon receipt of a request to deliver mail for an eligible +destination, the \fBflush\fR(8) server requests delivery of all messages +that are listed in that destination's logfile, regardless of the +recipients of those messages. This is not an issue for mail +that is sent to a \fBrelay_domains\fR destination because +such mail typically only has recipients in one domain. +.SH "CONFIGURATION PARAMETERS" +.na +.nf +.ad +.fi +Changes to \fBmain.cf\fR are picked up automatically as \fBflush\fR(8) +processes run for only a limited amount of time. Use the command +"\fBpostfix reload\fR" to speed up a change. + +The text below provides only a parameter summary. See +\fBpostconf\fR(5) for more details including examples. +.IP "\fBconfig_directory (see 'postconf -d' output)\fR" +The default location of the Postfix main.cf and master.cf +configuration files. +.IP "\fBdaemon_timeout (18000s)\fR" +How much time a Postfix daemon process may take to handle a +request before it is terminated by a built\-in watchdog timer. +.IP "\fBfast_flush_domains ($relay_domains)\fR" +Optional list of destinations that are eligible for per\-destination +logfiles with mail that is queued to those destinations. +.IP "\fBfast_flush_refresh_time (12h)\fR" +The time after which a non\-empty but unread per\-destination "fast +flush" logfile needs to be refreshed. +.IP "\fBfast_flush_purge_time (7d)\fR" +The time after which an empty per\-destination "fast flush" logfile +is deleted. +.IP "\fBipc_timeout (3600s)\fR" +The time limit for sending or receiving information over an internal +communication channel. +.IP "\fBmax_idle (100s)\fR" +The maximum amount of time that an idle Postfix daemon process waits +for an incoming connection before terminating voluntarily. +.IP "\fBmax_use (100)\fR" +The maximal number of incoming connections that a Postfix daemon +process will service before terminating voluntarily. +.IP "\fBparent_domain_matches_subdomains (see 'postconf -d' output)\fR" +A list of Postfix features where the pattern "example.com" also +matches subdomains of example.com, +instead of requiring an explicit ".example.com" pattern. +.IP "\fBprocess_id (read\-only)\fR" +The process ID of a Postfix command or daemon process. +.IP "\fBprocess_name (read\-only)\fR" +The process name of a Postfix command or daemon process. +.IP "\fBqueue_directory (see 'postconf -d' output)\fR" +The location of the Postfix top\-level queue directory. +.IP "\fBsyslog_facility (mail)\fR" +The syslog facility of Postfix logging. +.IP "\fBsyslog_name (see 'postconf -d' output)\fR" +A prefix that is prepended to the process name in syslog +records, so that, for example, "smtpd" becomes "prefix/smtpd". +.PP +Available in Postfix 3.3 and later: +.IP "\fBservice_name (read\-only)\fR" +The master.cf service name of a Postfix daemon process. +.SH "FILES" +.na +.nf +/var/spool/postfix/flush, "fast flush" logfiles. +.SH "SEE ALSO" +.na +.nf +smtpd(8), SMTP server +qmgr(8), queue manager +postconf(5), configuration parameters +master(5), generic daemon options +master(8), process manager +postlogd(8), Postfix logging +syslogd(8), system logging +.SH "README FILES" +.na +.nf +.ad +.fi +Use "\fBpostconf readme_directory\fR" or +"\fBpostconf html_directory\fR" to locate this information. +.na +.nf +ETRN_README, Postfix ETRN howto +.SH "LICENSE" +.na +.nf +.ad +.fi +The Secure Mailer license must be distributed with this software. +.SH HISTORY +.ad +.fi +This service was introduced with Postfix version 1.0. +.SH "AUTHOR(S)" +.na +.nf +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 |