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    Command:

    postfix-wrapper

    
    
    

    DESCRIPTION

           Postfix  versions  2.6  and  later provide support for multiple Postfix
           instances. Instances share executable files and documentation, but have
           their own directories for configuration, queue and data files.
    
           This  document  describes  how  the  familiar "postfix start" etc. user
           interface can be used to manage one or multiple Postfix instances,  and
           gives details of an API to coordinate activities between the postfix(1)
           command and a multi-instance manager program.
    
           With multi-instance support, the default  Postfix  instance  is  always
           required. The config_directory parameter's default value specifies that
           instance's configuration file location.
    
    
    

    GENERAL OPERATION

           Multi-instance support is backwards compatible: when you run  only  one
           Postfix  instance,  commands  such  as  "postfix start" will not change
           behavior at all.
    
           Even with multiple Postfix instances, you can keep using the same post-
           fix commands in boot scripts, upgrade procedures, and other places. The
           commands do more work, but humans are not forced to learn new tricks.
    
           For example, to start all Postfix instances, use:
    
                  # postfix start
    
           Other postfix(1) commands also work as expected. For example,  to  find
           out  what  Postfix  instances  exist in a multi-instance configuration,
           use:
    
                  # postfix status
    
           This enumerates the status of all Postfix  instances  within  a  multi-
           instance configuration.
    
    
    

    MANAGING AN INDIVIDUAL POSTFIX INSTANCE

           To manage a specific Postfix instance, specify its configuration direc-
           tory on the postfix(1) command line:
    
                  # postfix -c /path/to/config_directory command
    
           Alternatively, the postfix(1) command accepts the instance's configura-
           tion  directory  via  the MAIL_CONFIG environment variable (the -c com-
           mand-line option has higher precedence).
    
           When no Postfix instance information is specified, the postfix(1)  com-
           mand will operate on all Postfix instances.
    
    
    

    ENABLING POSTFIX(1) MULTI-INSTANCE MODE

           By default, the postfix(1) command operates in single-instance mode. In
           this mode the command invokes the postfix-script  file  directly  (cur-
           example:
    
                  /etc/postfix/main.cf:
                      multi_instance_wrapper = $daemon_directory/postfix-wrapper
                      multi_instance_directories = /etc/postfix-test
    
           The  $daemon_directory/postfix-wrapper file implements a simple manager
           and contains instructions for creating Postfix instances by hand.   The
           postmulti(1) command provides a more extensive implementation including
           support for life-cycle management.
    
           The multi_instance_directories and other main.cf parameters are  listed
           below in the CONFIGURATION PARAMETERS section.
    
           In   multi-instance   mode,   the   postfix(1)   command   invokes  the
           $multi_instance_wrapper command instead  of  the  postfix-script  file.
           This  multi-instance manager in turn executes the postfix(1) command in
           single-instance mode for each Postfix instance.
    
           To illustrate the main ideas behind multi-instance operation, below  is
           an  example  of  a simple but useful multi-instance manager implementa-
           tion:
    
                  #!/bin/sh
    
                  : ${command_directory?"do not invoke this command directly"}
    
                  POSTCONF=$command_directory/postconf
                  POSTFIX=$command_directory/postfix
                  instance_dirs=`$POSTCONF -h multi_instance_directories |
                                  sed 's/,/ /'` || exit 1
    
                  err=0
                  for dir in $config_directory $instance_dirs
                  do
                      case "$1" in
                      stop|abort|flush|reload|drain)
                          test "`$POSTCONF -c $dir -h multi_instance_enable`" \
                              = yes || continue;;
                      start)
                          test "`$POSTCONF -c $dir -h multi_instance_enable`" \
                              = yes || {
                              $POSTFIX -c $dir check || err=$?
                              continue
                          };;
                      esac
                      $POSTFIX -c $dir "$@" || err=$?
                  done
    
                  exit $err
    
    
    

    PER-INSTANCE MULTI-INSTANCE MANAGER CONTROLS

           "check" so that problems will be reported even  when  the  instance  is
           disabled.
    
    
    

    MAINTAINING SHARED AND NON-SHARED FILES

           Some  files  are  shared between Postfix instances, such as executables
           and manpages, and some files are per-instance,  such  as  configuration
           files, mail queue files, and data files.  See the NON-SHARED FILES sec-
           tion below for a list of per-instance files.
    
           Before Postfix multi-instance support was implemented, the executables,
           manpages,  etc.,  have  always  been  maintained as part of the default
           Postfix instance.
    
           With multi-instance support, we simply continue to do  this.   Specifi-
           cally,  a  Postfix  instance will not check or update shared files when
           that instance's config_directory  value  is  listed  with  the  default
           main.cf file's multi_instance_directories parameter.
    
           The  consequence  of this approach is that the default Postfix instance
           should be checked and updated before any other instances.
    
    
    

    MULTI-INSTANCE API SUMMARY

           Only  the   multi-instance   manager   implements   support   for   the
           multi_instance_enable  configuration parameter. The multi-instance man-
           ager  will  start  only  Postfix  instances  whose  main.cf  file   has
           "multi_instance_enable  =  yes".  A  setting  of  "no" allows a Postfix
           instance to be tested by hand.
    
           The postfix(1) command operates on only one Postfix instance  when  the
           -c  option  is specified, or when MAIL_CONFIG is present in the process
           environment. This is necessary to terminate recursion.
    
           Otherwise, when the multi_instance_directories parameter value is  non-
           empty,  the  postfix(1) command executes the command specified with the
           multi_instance_wrapper parameter, instead of executing the commands  in
           postfix-script.
    
           The  multi-instance  manager  skips commands such as "stop" or "reload"
           that require a running Postfix instance, when an instance does not have
           "multi_instance_enable = yes".  This avoids false error messages.
    
           The multi-instance manager replaces a "start" command by "check" when a
           Postfix instance's main.cf file does not have "multi_instance_enable  =
           yes".  This  substitution  ensures  that problems will be reported even
           when the instance is disabled.
    
           No Postfix command or script will update or check shared files when its
           config_directory   value   is   listed   in   the   default   main.cf's
           multi_instance_directories parameter  value.   Therefore,  the  default
           instance  should  be  checked  and updated before any Postfix instances
           that depend on it.
    
                  on the specified Postfix instance. This environment variable  is
                  exported  by  the  postfix(1) -c option, so that postfix(1) com-
                  mands in descendant processes will work correctly.
    
    
    

    CONFIGURATION PARAMETERS

           The text below provides only a parameter summary. See  postconf(5)  for
           more details.
    
           multi_instance_directories (empty)
                  An  optional  list of non-default Postfix configuration directo-
                  ries; these directories belong to additional  Postfix  instances
                  that  share  the Postfix executable files and documentation with
                  the default Postfix instance, and  that  are  started,  stopped,
                  etc., together with the default Postfix instance.
    
           multi_instance_wrapper (empty)
                  The  pathname of a multi-instance manager command that the post-
                  fix(1)  command  invokes  when  the   multi_instance_directories
                  parameter value is non-empty.
    
           multi_instance_name (empty)
                  The optional instance name of this Postfix instance.
    
           multi_instance_group (empty)
                  The optional instance group name of this Postfix instance.
    
           multi_instance_enable (no)
                  Allow  this  Postfix instance to be started, stopped, etc., by a
                  multi-instance manager.
    
    
    

    NON-SHARED FILES

           config_directory (see 'postconf -d' output)
                  The default location of the Postfix main.cf and  master.cf  con-
                  figuration files.
    
           data_directory (see 'postconf -d' output)
                  The  directory  with  Postfix-writable  data files (for example:
                  caches, pseudo-random numbers).
    
           queue_directory (see 'postconf -d' output)
                  The location of the Postfix top-level queue directory.
    
    
    

    SEE ALSO

           postfix(1) Postfix control program
           postmulti(1) full-blown multi-instance manager
           $daemon_directory/postfix-wrapper simple multi-instance manager
    
    
    

    LICENSE

           The Secure Mailer license must be distributed with this software.
    
    
    

    AUTHOR(S)

           Wietse Venema
    
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