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MASTER(8)										MASTER(8)

       master - Postfix master process

       master [-c config_dir] [-e exit_time] [-D] [-t] [-v]

       The  master 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. The exception to this
       rule is the resident Postfix queue manager.

       The  behavior  of the master daemon is controlled by the master.cf configuration file. The
       table specifies zero or more servers in the UNIX or INET  domain,  or  servers  that  take
       requests  from  a FIFO. Precise configuration details are given in the master.cf file, and
       in the manual pages of the respective daemons.


       -c config_dir
	      Read the main.cf and master.cf configuration files in the named  directory  instead
	      of the default configuration directory.

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

       -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.

       -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  daemon  is  not

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


       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.

	      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).

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

	      Directory with Postfix configuration files.

       The following main.cf parameters are especially relevant to this program. See the  Postfix
       main.cf	file  for  syntax  details and for default values. Use the postfix reload command
       after a configuration change.


	      Lists of names of environment parameters that can be imported  from  (exported  to)
	      non-Postfix processes.

	      The owner of the mail queue and of most Postfix processes.

	      Directory with Postfix support programs.

	      Directory with Postfix daemon programs.

	      Top-level  directory of the Postfix queue. This is also the root directory of Post-
	      fix daemons that run chrooted.

Resource controls
	      Default limit for the number of simultaneous child processes that provide  a  given

	      Limit the time in seconds that a child process waits between service requests.

	      Limit the number of service requests handled by a child process.

	      Time to avoid forking a server that appears to be broken.

       /etc/postfix/main.cf: global configuration file.
       /etc/postfix/master.cf: master process configuration file.
       /var/spool/postfix/pid/master.pid: master lock file.

       qmgr(8) queue manager
       pickup(8) local mail pickup
       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

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