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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 - scache(8) </title>
+</head> <body> <pre>
+SCACHE(8) SCACHE(8)
+
+<b>NAME</b>
+ scache - Postfix shared connection cache server
+
+<b>SYNOPSIS</b>
+ <b>scache</b> [generic Postfix daemon options]
+
+<b>DESCRIPTION</b>
+ The <a href="scache.8.html"><b>scache</b>(8)</a> server maintains a shared multi-connection cache. This
+ information can be used by, for example, Postfix SMTP clients or other
+ Postfix delivery agents.
+
+ The connection cache is organized into logical destination names, phys-
+ ical endpoint names, and connections.
+
+ As a specific example, logical SMTP destinations specify (transport,
+ domain, port), and physical SMTP endpoints specify (transport, IP
+ address, port). An SMTP connection may be saved after a successful
+ mail transaction.
+
+ In the general case, one logical destination may refer to zero or more
+ physical endpoints, one physical endpoint may be referenced by zero or
+ more logical destinations, and one endpoint may refer to zero or more
+ connections.
+
+ The exact syntax of a logical destination or endpoint name is applica-
+ tion dependent; the <a href="scache.8.html"><b>scache</b>(8)</a> server does not care. A connection is
+ stored as a file descriptor together with application-dependent infor-
+ mation that is needed to re-activate a connection object. Again, the
+ <a href="scache.8.html"><b>scache</b>(8)</a> server is completely unaware of the details of that informa-
+ tion.
+
+ All information is stored with a finite time to live (ttl). The con-
+ nection cache daemon terminates when no client is connected for
+ <b><a href="postconf.5.html#max_idle">max_idle</a></b> time units.
+
+ This server implements the following requests:
+
+ <b>save_endp</b> <i>ttl endpoint endpoint</i><b>_</b><i>properties file</i><b>_</b><i>descriptor</i>
+ Save the specified file descriptor and connection property data
+ under the specified endpoint name. The endpoint properties are
+ used by the client to re-activate a passivated connection
+ object.
+
+ <b>find_endp</b> <i>endpoint</i>
+ Look up cached properties and a cached file descriptor for the
+ specified endpoint.
+
+ <b>save_dest</b> <i>ttl destination destination</i><b>_</b><i>properties endpoint</i>
+ Save the binding between a logical destination and an endpoint
+ under the destination name, together with destination specific
+ connection properties. The destination properties are used by
+ the client to re-activate a passivated connection object.
+
+ <b>find_dest</b> <i>destination</i>
+ Look up cached destination properties, cached endpoint proper-
+ ties, and a cached file descriptor for the specified logical
+ destination.
+
+<b>SECURITY</b>
+ The <a href="scache.8.html"><b>scache</b>(8)</a> server is not security-sensitive. It does not talk to the
+ network, and it does not talk to local users. The <a href="scache.8.html"><b>scache</b>(8)</a> server can
+ run chrooted at fixed low privilege.
+
+ The <a href="scache.8.html"><b>scache</b>(8)</a> server is not a trusted process. It must not be used to
+ store information that is security sensitive.
+
+<b>DIAGNOSTICS</b>
+ Problems and transactions are logged to <b>syslogd</b>(8) or <a href="postlogd.8.html"><b>postlogd</b>(8)</a>.
+
+<b>BUGS</b>
+ The session cache cannot be shared among multiple machines.
+
+ When a connection expires from the cache, it is closed without the
+ appropriate protocol specific handshake.
+
+<b>CONFIGURATION PARAMETERS</b>
+ Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically as <a href="scache.8.html"><b>scache</b>(8)</a> processes
+ run for only a limited amount of time. Use the command "<b>postfix reload</b>"
+ to speed up a change.
+
+ The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for
+ more details including examples.
+
+<b>RESOURCE CONTROLS</b>
+ <b><a href="postconf.5.html#connection_cache_ttl_limit">connection_cache_ttl_limit</a> (2s)</b>
+ The maximal time-to-live value that the <a href="scache.8.html"><b>scache</b>(8)</a> connection
+ cache server allows.
+
+ <b><a href="postconf.5.html#connection_cache_status_update_time">connection_cache_status_update_time</a> (600s)</b>
+ How frequently the <a href="scache.8.html"><b>scache</b>(8)</a> server logs usage statistics with
+ connection cache hit and miss rates for logical destinations and
+ for physical endpoints.
+
+<b>MISCELLANEOUS CONTROLS</b>
+ <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
+ The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
+ figuration files.
+
+ <b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b>
+ How much time a Postfix daemon process may take to handle a
+ request before it is terminated by a built-in watchdog timer.
+
+ <b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b>
+ The time limit for sending or receiving information over an
+ internal communication channel.
+
+ <b><a href="postconf.5.html#max_idle">max_idle</a> (100s)</b>
+ The maximum amount of time that an idle Postfix daemon process
+ waits for an incoming connection before terminating voluntarily.
+
+ <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
+ The process ID of a Postfix command or daemon process.
+
+ <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
+ The process name of a Postfix command or daemon process.
+
+ <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
+ The syslog facility of Postfix logging.
+
+ <b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
+ A prefix that is prepended to the process name in syslog
+ records, so that, for example, "smtpd" becomes "prefix/smtpd".
+
+ Available in Postfix 3.3 and later:
+
+ <b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b>
+ The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process.
+
+<b>SEE ALSO</b>
+ <a href="smtp.8.html">smtp(8)</a>, SMTP client
+ <a href="postconf.5.html">postconf(5)</a>, configuration parameters
+ <a href="master.8.html">master(8)</a>, process manager
+ <a href="postlogd.8.html">postlogd(8)</a>, Postfix logging
+ syslogd(8), system logging
+
+<b>README FILES</b>
+ <a href="CONNECTION_CACHE_README.html">CONNECTION_CACHE_README</a>, Postfix connection cache
+
+<b>LICENSE</b>
+ The Secure Mailer license must be distributed with this software.
+
+<b>HISTORY</b>
+ This service was introduced with Postfix version 2.2.
+
+<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
+
+ SCACHE(8)
+</pre> </body> </html>