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MASTER(8postfix)								 MASTER(8postfix)

NAME
       master - Postfix master process

SYNOPSIS
       master [-Ddtv] [-c config_dir] [-e exit_time]

DESCRIPTION
       The  master(8) daemon is the resident process that runs Postfix daemons on demand: daemons
       to send or receive messages via the network, daemons to deliver mail locally, etc.   These
       daemons are created on demand up to a configurable maximum number per service.

       Postfix	daemons  terminate voluntarily, either after being idle for a configurable amount
       of time, or after having serviced a configurable number of requests.  Exceptions  to  this
       rule  are  the  resident  queue	manager, address verification server, and the TLS session
       cache and pseudo-random number server.

       The behavior of the master(8) daemon is controlled by the master.cf configuration file, as
       described in master(5).

       Options:

       -c config_dir
	      Read  the  main.cf and master.cf configuration files in the named directory instead
	      of the default configuration directory.	This  also  overrides  the  configuration
	      files for other Postfix daemon processes.

       -D     After  initialization,  run a debugger on the master process. The debugging command
	      is specified with the debugger_command in the main.cf global configuration file.

       -d     Do not redirect stdin, stdout or stderr to /dev/null, and do not discard	the  con-
	      trolling terminal. This must be used for debugging only.

       -e exit_time
	      Terminate  the master process after exit_time seconds. Child processes terminate at
	      their convenience.

       -t     Test mode. Return a zero exit status when the master.pid lock file does  not  exist
	      or when that file is not locked.	This is evidence that the master(8) daemon is not
	      running.

       -v     Enable verbose logging for debugging purposes. This option is passed  on	to  child
	      processes. Multiple -v options make the software increasingly verbose.

       Signals:

       SIGHUP Upon receipt of a HUP signal (e.g., after "postfix reload"), the master process re-
	      reads its configuration files. If a service has been  removed  from  the	master.cf
	      file,  its  running  processes are terminated immediately.  Otherwise, running pro-
	      cesses are allowed to terminate as soon as is convenient, so that changes  in  con-
	      figuration settings affect only new service requests.

       SIGTERM
	      Upon  receipt  of  a  TERM signal (e.g., after "postfix abort"), the master process
	      passes the signal on to its child processes and terminates.  This is useful for  an
	      emergency  shutdown.  Normally one would terminate only the master ("postfix stop")
	      and allow running processes to finish what they are doing.

DIAGNOSTICS
       Problems are reported to syslogd(8).

ENVIRONMENT
       MAIL_DEBUG
	      After initialization, start a debugger as specified with the debugger_command  con-
	      figuration parameter in the main.cf configuration file.

       MAIL_CONFIG
	      Directory with Postfix configuration files.

CONFIGURATION PARAMETERS
       Unlike  most Postfix daemon processes, the master(8) server does not automatically pick up
       changes to main.cf. Changes to master.cf are  never  picked  up	automatically.	 Use  the
       "postfix reload" command after a configuration change.

RESOURCE AND RATE CONTROLS
       default_process_limit(100)
	      The default maximal number of Postfix child processes that provide a given service.

       max_idle(100s)
	      The  maximum amount of time that an idle Postfix daemon process waits for an incom-
	      ing connection before terminating voluntarily.

       max_use(100)
	      The maximal number of incoming connections that a Postfix daemon process will  ser-
	      vice before terminating voluntarily.

       service_throttle_time(60s)
	      How  long  the  Postfix  master(8) waits before forking a server that appears to be
	      malfunctioning.

       Available in Postfix version 2.6 and later:

       master_service_disable (empty)
	      Selectively disable master(8) listener ports by service type or by service name and
	      type.

MISCELLANEOUS CONTROLS
       config_directory (see 'postconf -d' output)
	      The default location of the Postfix main.cf and master.cf configuration files.

       daemon_directory (see 'postconf -d' output)
	      The directory with Postfix support programs and daemon programs.

       debugger_command (empty)
	      The  external  command to execute when a Postfix daemon program is invoked with the
	      -D option.

       inet_interfaces (all)
	      The network interface addresses that this mail system receives mail on.

       inet_protocols (ipv4)
	      The Internet protocols Postfix will attempt to use when making or accepting connec-
	      tions.

       import_environment (see 'postconf -d' output)
	      The  list  of environment parameters that a Postfix process will import from a non-
	      Postfix parent process.

       mail_owner (postfix)
	      The UNIX system account that owns the Postfix queue and most  Postfix  daemon  pro-
	      cesses.

       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".

FILES
       To expand the directory names below into their actual values, use  the  command	"postconf
       config_directory" etc.

       $config_directory/main.cf, global configuration file.
       $config_directory/master.cf, master server configuration file.
       $queue_directory/pid/master.pid, master lock file.
       $data_directory/master.lock, master lock file.

SEE ALSO
       qmgr(8), queue manager
       verify(8), address verification
       master(5), master.cf configuration file syntax
       postconf(5), main.cf configuration parameter syntax
       syslogd(8), system logging

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

AUTHOR(S)
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

										 MASTER(8postfix)
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