NAME

       master - Cyrus IMAP documentation

       The Cyrus IMAP master process.

SYNOPSIS

       master [ -C config-file ] [ -M alternate cyrus.conf ]
           [ -l listen queue ] [ -p pidfile ]
           [ -j janitor period ] [ -d | -D ] [ -L logfile ]

DESCRIPTION

       master  is  the  process  that  controls  all  of  the  Cyrus  processes.  This process is
       responsible for creating all imapd, pop3d,  lmtpd  and  timsieved  child  processes.  This
       process also performs scheduled cleanup/maintenance.

       If this process dies, then no new sessions will be started.

       It kills itself and all child processes when it receives a SIGTERM.

       master  reads  its  configuration  options  out of the imapd.conf(5) file unless specified
       otherwise by -C.

OPTIONS

       -C alternate imapd.conf
              Use  the  specified  configuration  file  config-file  rather  than   the   default
              imapd.conf(5).

       -M alternate cyrus.conf
              Specifies an alternate cyrus.conf for use by master.

       -l listen queue backlog
              Increase  the listen queue backlog. By default, the listen queue is set to 32.   On
              systems with a high connection rate, it may be desirable to  increase  this  value.
              refer to listen(2) for details.

       -j janitor full-sweeps per second
              Sets  the  number  of  times  per  second the janitor should sweep the entire child
              table.  Leave it at the default of 1 unless you have a really high fork  rate  (and
              you  have  not increased the child hash table size when you compiled Cyrus from its
              default of 10000 entries).

       -p pidfile
              Use pidfile as the pidfile.  If not specified, defaults to /var/run/master.pid

       -d     Start in daemon mode (run in background and disconnect from controlling terminal).

       -D     Don’t close stdin/stdout/stderr. Primarily useful for debugging.  Note that -d  and
              -D cannot be used together; consider using -L instead.

       -L logfile
              Redirect stdout and stderr to the given logfile.

CONFIGURATION

       Upon  execution, master reads its configuration information out of the cyrus.conf(5) file,
       or an alternative if -M is used.

       master rereads its configuration file when it receives a hangup signal, SIGHUP.   Services
       and  events  may be added, deleted or modified when the configuration file is reread.  Any
       active services removed  from  the  configuration  file  will  be  allowed  to  run  until
       completion.   Services added or modified to listen on a privileged port may not be able to
       bind the port, depending on your system configuration.  In this case  a  full  restart  is
       needed.

       master  propagates the hangup signal, SIGHUP, to its child service processes, so that they
       stop waiting for incoming connections and exit, allowing them to  be  recycled.   This  is
       useful  to  make  services  take  into  account  a  new version of the imapd.conf(5) file.
       Children that are servicing a client connection when SIGHUP is received are allowed to run
       until  the  client logouts before being recycled. It may take a long time until the client
       logouts, so a log message is generated for processes that have not  been  recycled  within
       30s.

NOTES

       The environment variable CYRUS_VERBOSE can be set to log additional debugging information.
       Setting the value to 1 results in base level logging.  Setting it higher results  in  more
       log messages being generated.

FILES

       /etc/cyrus.conf, /etc/imapd.conf, /var/run/master.pid

SEE ALSO

       cyrus.conf(5), imapd.conf(5), imapd(8), pop3d(8), lmtpd(8), timsieved(8), idled(8)

AUTHOR

       The Cyrus Team, Nic Bernstein (Onlight)

COPYRIGHT

       1993–2023, The Cyrus Team