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MASTER(8)                                                                                          MASTER(8)



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  Post-fix Postfix
              fix 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 controlling  ter-minal. terminal.
              minal. This must be used for debugging only.

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

       -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 pro-cesses processes
              cesses 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.

       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 configuration
              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  incoming  connec-tion connection
              tion 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  malfunction-ing. malfunctioning.
              ing.

       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 (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 Postfix process will import from a non-Postfix par-ent parent
              ent process.

       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)
              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_direc-tory" config_directory"
       tory" 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 file 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(8)