Manual browser: scache(8)
|SCACHE(8)||System Manager's Manual||SCACHE(8)|
NAMEscache - Postfix shared connection cache server
scache [generic Postfix daemon options]
The scache(8) server maintains a shared multi-connection cache. This information can be used by, for example, Postfix SMTP clients or other Postfix delivery agents.
- 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 properties, and a cached file descriptor for the specified logical destination.
The scache(8) server is not security-sensitive. It does not talk to the network, and it does not talk to local users. The scache(8) server can run chrooted at fixed low privilege.
Problems and transactions are logged to syslogd(8).
The session cache cannot be shared among multiple machines.
Changes to main.cf are picked up automatically as scache(8) processes run for only a limited amount of time. Use the command " postfix reload" to speed up a change.
- connection_cache_ttl_limit (2s)
- The maximal time-to-live value that the scache(8) connection cache server allows.
- connection_cache_status_update_time (600s)
- How frequently the scache(8) server logs usage statistics with connection cache hit and miss rates for logical destinations and for physical endpoints.
- 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.
- 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.
- 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.
- 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".
smtp(8), SMTP client
postconf(5), configuration parameters
master(8), process manager
syslogd(8), system logging
Use "postconf readme_directory" or " postconf html_directory" to locate this information.
CONNECTION_CACHE_README, Postfix connection cache
The Secure Mailer license must be distributed with this software.
This service was introduced with Postfix version 2.2.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA