MASTER(8)                                               MASTER(8)

       master - Postfix master process

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

       The  master daemon is the resident process that runs Post-
       fix 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 and the  resident
       address verification server.

       The  behavior  of  the  master daemon is controlled by the 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 file, and in the manual pages
       of the respective daemons.


       -c config_dir
              Read the and configuration  files
              in  the named directory instead of the default con-
              figuration directory.

       -e exit_time
              Terminate the master process after  exit_time  sec-
              onds.  Child  processes  terminate  at their conve-

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

       -t     Test  mode. Return a zero exit status when the mas-
     lock file does not exist or when that  file
              is  not  locked.   This is evidence that the master
              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.


       SIGHUP Upon receipt of a HUP signal (e.g.,  after  postfix
              reload), the master process re-reads its configura-
              tion files. If a service has been removed from  the
      file,  its  running processes are termi-
              nated 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  ter-
              minate  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 configuration parameter
              in the configuration file.

              Directory with Postfix configuration files.

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

       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.

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

       max_idle (100s)
              The maximum amount of time  that  an  idle  Postfix
              daemon  process  waits for the next service request
              before exiting.

       max_use (100)
              The maximal number of connection requests before  a
              Postfix daemon process terminates.

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

       config_directory (see 'postconf -d' output)
              The default location of  the  Postfix  and
     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 dae-
              mon program is invoked with the -D option.

       inet_interfaces (all)
              The network interface addresses that this mail sys-
              tem receives mail on.

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

       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 pro-

       process_name (read-only)
              The process name of a  Postfix  command  or  daemon

       queue_directory (see 'postconf -d' output)
              The  location of the Postfix top-level queue direc-

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (postfix)
              The mail system name that is prepended to the  pro-
              cess  name  in  syslog  records,  so  that  "smtpd"
              becomes, for example, "postfix/smtpd".

       /etc/postfix/, global configuration file.
       /etc/postfix/, master server configuration file.
       /var/spool/postfix/pid/, master lock file.

       qmgr(8), queue manager
       verify(8), address verification
       postconf(5), configuration parameters
       syslogd(8), system logging

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