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Rename

<!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=us-ascii">
<title> Postfix manual - scache(8) </title>
</head> <body> <pre>
SCACHE(8) SCACHE(8)

NAME
 scache - Postfix shared connection cache server

SYNOPSIS
 scache [generic Postfix daemon options]

DESCRIPTION
 The <a href="scache.8.html">scache(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">scache(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">scache(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
 <a href="postconf.5.html#max_idle">max_idle</a> time units.

This server implements the following requests:

save_endp ttl endpoint endpoint_properties file_descriptor
 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.

find_endp endpoint
 Look up cached properties and a cached file descriptor for the
 specified endpoint.

save_dest ttl destination destination_properties endpoint
 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.

find_dest destination
 Look up cached destination properties, cached endpoint proper-
 ties, and a cached file descriptor for the specified logical
 destination.

SECURITY
 The <a href="scache.8.html">scache(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">scache(8)</a> server can
 run chrooted at fixed low privilege.

The <a href="scache.8.html">scache(8)</a> server is not a trusted process. It must not be used to
 store information that is security sensitive.

DIAGNOSTICS
 Problems and transactions are logged to syslogd(8).

BUGS
 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.

CONFIGURATION PARAMETERS
 Changes to <a href="postconf.5.html">main.cf</a> are picked up automatically as <a href="scache.8.html">scache(8)</a> processes
 run for only a limited amount of time. Use the command "postfix reload"
 to speed up a change.

The text below provides only a parameter summary. See <a href="postconf.5.html">postconf(5)</a> for
 more details including examples.

RESOURCE CONTROLS
 <a href="postconf.5.html#connection_cache_ttl_limit">connection_cache_ttl_limit</a> (2s)
 The maximal time-to-live value that the <a href="scache.8.html">scache(8)</a> connection
 cache server allows.

<a href="postconf.5.html#connection_cache_status_update_time">connection_cache_status_update_time</a> (600s)
 How frequently the <a href="scache.8.html">scache(8)</a> server logs usage statistics with
 connection cache hit and miss rates for logical destinations and
 for physical endpoints.

MISCELLANEOUS CONTROLS
 <a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)
 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.

<a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)
 How much time a Postfix daemon process may take to handle a
 request before it is terminated by a built-in watchdog timer.

<a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)
 The time limit for sending or receiving information over an
 internal communication channel.

<a href="postconf.5.html#max_idle">max_idle</a> (100s)
 The maximum amount of time that an idle Postfix daemon process
 waits for an incoming connection before terminating voluntarily.

<a href="postconf.5.html#process_id">process_id</a> (read-only)
 The process ID of a Postfix command or daemon process.

<a href="postconf.5.html#process_name">process_name</a> (read-only)
 The process name of a Postfix command or daemon process.

<a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)
 The syslog facility of Postfix logging.

<a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)
 The mail system name that is prepended to the process name in
 syslog records, so that "smtpd" becomes, for example, "post-
 fix/smtpd".

SEE ALSO
 <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
 syslogd(8), system logging

README FILES
 <a href="CONNECTION_CACHE_README.html">CONNECTION_CACHE_README</a>, Postfix connection cache

LICENSE
 The Secure Mailer license must be distributed with this software.

HISTORY
 This service was introduced with Postfix version 2.2.

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

SCACHE(8)
</pre> </body> </html>