Manual browser: flush(8)
|FLUSH(8)||System Manager's Manual||FLUSH(8)|
NAMEflush - Postfix fast flush server
flush [generic Postfix daemon options]
The flush(8) server maintains a record of deferred mail by destination. This information is used to improve the performance of the SMTP ETRN request, and of its command-line equivalent, " sendmail -qR" or "postqueue -f". This program expects to be run from the master(8) process manager.
- add sitename queueid
- Inform the flush(8) server that the message with the specified queue ID is queued for the specified destination.
- send_site sitename
- Request delivery of mail that is queued for the specified destination.
- send_file queueid
- Request delivery of the specified deferred message.
Refresh non-empty per-destination logfiles that were not read in $fast_flush_refresh_time hours, by simulating send requests (see above) for the corresponding destinations.
- Do a refresh for all per-destination logfiles.
The flush(8) server is not security-sensitive. It does not talk to the network, and it does not talk to local users. The fast flush server can run chrooted at fixed low privilege.
Problems and transactions are logged to syslogd(8).
Fast flush logfiles are truncated only after a "send" request, not when mail is actually delivered, and therefore can accumulate outdated or redundant data. In order to maintain sanity, "refresh" must be executed periodically. This can be automated with a suitable wakeup timer setting in the master.cf configuration file.
Changes to main.cf are picked up automatically as flush(8) processes run for only a limited amount of time. Use the command " postfix reload" to speed up a change.
- config_directory (see 'postconf -d' output)
- The default location of the Postfix main.cf and master.cf configuration files.
- daemon_timeout (18000s)
- How much time a Postfix daemon process may take to handle a request before it is terminated by a built-in watchdog timer.
- fast_flush_domains ($relay_domains)
- Optional list of destinations that are eligible for per-destination logfiles with mail that is queued to those destinations.
- fast_flush_refresh_time (12h)
- The time after which a non-empty but unread per-destination "fast flush" logfile needs to be refreshed.
- fast_flush_purge_time (7d)
- The time after which an empty per-destination "fast flush" logfile is deleted.
- ipc_timeout (3600s)
- The time limit for sending or receiving information over an internal communication channel.
- max_idle (100s)
- The maximum amount of time that an idle Postfix daemon process waits for an incoming connection before terminating voluntarily.
- max_use (100)
- The maximal number of incoming connections that a Postfix daemon process will service before terminating voluntarily.
- parent_domain_matches_subdomains (see 'postconf -d' output)
- What Postfix features match subdomains of "domain.tld" automatically, instead of requiring an explicit ".domain.tld" pattern.
- process_id (read-only)
- The process ID of a Postfix command or daemon process.
- process_name (read-only)
- The process name of a Postfix command or daemon process.
- queue_directory (see 'postconf -d' output)
- The location of the Postfix top-level queue directory.
- syslog_facility (mail)
- The syslog facility of Postfix logging.
- syslog_name (see 'postconf -d' output)
- The mail system name that is prepended to the process name in syslog records, so that "smtpd" becomes, for example, "postfix/smtpd".
/var/spool/postfix/flush, "fast flush" logfiles.
smtpd(8), SMTP server
qmgr(8), queue manager
postconf(5), configuration parameters
master(5), generic daemon options
master(8), process manager
syslogd(8), system logging
Use "postconf readme_directory" or " postconf html_directory" to locate this information.
ETRN_README, Postfix ETRN howto
The Secure Mailer license must be distributed with this software.
This service was introduced with Postfix version 1.0.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA