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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 19:59:03 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 19:59:03 +0000 |
| commit | a848231ae0f346dc7cc000973fbeb65b0894ee92 (patch) | |
| tree | 44b60b367c86723cc78383ef247885d72b388afe /html/scache.8.html | |
| parent | Initial commit. (diff) | |
| download | postfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.tar.xz postfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.zip | |
Adding upstream version 3.8.5.upstream/3.8.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'html/scache.8.html')
| -rw-r--r-- | html/scache.8.html | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/html/scache.8.html b/html/scache.8.html new file mode 100644 index 0000000..932b99a --- /dev/null +++ b/html/scache.8.html @@ -0,0 +1,166 @@ +<!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"> +<link rel='stylesheet' type='text/css' href='postfix-doc.css'> +<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> |