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MASTER(8)		    System Manager's Manual		     MASTER(8)

       master -	Postfix	master process

       master [-Dditvw]	[-c config_dir]	[-e exit_time]

       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 man-
       ager,  address  verification  server,  and  the	TLS  session cache and
       pseudo-random number server.

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


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

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

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

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

       -i     Enable  init  mode:  do  not  become  a session or process group
	      leader; and similar to -s, do not	redirect stdout	to  /dev/null,
	      so  that	"maillog_file  = /dev/stdout" works.  This mode	is al-
	      lowed only if the	process	ID equals 1.

	      This feature is available	in Postfix 3.3 and later.

       -s     Do not redirect stdout to	/dev/null,  so	that  "maillog_file  =
	      /dev/stdout" works.

	      This feature is available	in Postfix 3.4 and later.

       -t     Test  mode.  Return  a zero exit status when the 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 soft-
	      ware increasingly	verbose.

       -w     Wait in a	dummy foreground process, while	the real master	daemon
	      initializes in  a	 background  process.	The  dummy  foreground
	      process  returns	a  zero	 exit status only if the master	daemon
	      initialization is	successful, and	if it completes	in  a  reason-
	      able amount of time.

	      This feature is available	in Postfix 2.10	and later.


       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 file, its running processes
	      are terminated immediately.  Otherwise,  running	processes  are
	      allowed  to  terminate as	soon as	is convenient, so that changes
	      in configuration settings	affect only new	service	requests.

	      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.

       Problems	are reported to	syslogd(8) or postlogd(8).  The	exit status is
       non-zero	 in case of problems, including	problems while initializing as
       a master	daemon process in the background.

	      After initialization, start a debugger as	specified with the de-
	      bugger_command configuration parameter in	the configura-
	      tion file.

	      Directory	with Postfix configuration files.

       Unlike most Postfix daemon processes, the master(8) server does not au-
       tomatically  pick up changes to	Changes	to are never
       picked up automatically.	 Use the "postfix reload" command after	a con-
       figuration change.

       default_process_limit (100)
	      The  default maximal number of Postfix child processes that pro-
	      vide a given service.

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

       max_use (100)
	      The maximal number of incoming connections that a	Postfix	daemon
	      process will service 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.

       config_directory	(see 'postconf -d' output)
	      The default location of the Postfix and  con-
	      figuration 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 (all)
	      The  Internet  protocols Postfix will attempt to use when	making
	      or accepting connections.

       import_environment (see 'postconf -d' output)
	      The list of environment parameters  that	a  privileged  Postfix
	      process  will  import  from  a  non-Postfix  parent  process, or
	      name=value environment overrides.

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

       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)
	      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:

       service_name (read-only)
	      The service name of a Postfix daemon process.

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

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

       qmgr(8),	queue manager
       verify(8), address verification
       master(5), configuration file syntax
       postconf(5), configuration file syntax
       postlogd(8), Postfix logging
       syslogd(8), system logging

       The Secure Mailer license must be distributed with this software.

       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



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