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mfsmaster(8) This is part of MooseFS mfsmaster(8)

NAME

mfsmaster - start, restart or stop MooseFS master process

SYNOPSIS

mfsmaster [-c CFGFILE] [-f] [-d] [-u] [-n] [-i] [-a] [-e] [-x[x]] [-t LOCKTIMEOUT] [ACTION]

mfsmaster -v

mfsmaster -h

DESCRIPTION

mfsmaster is the master program of MooseFS.

OPTIONS

print version information and exit
print usage information and exit
specify alternative path of configuration file (default is mfsmaster.cfg in system configuration directory)
run in foreground, don't daemonize
run with dangerous options (names: DANGEROUS_*)
log undefined configuration values (when default is assumed)
do not attempt to increase limit of core dump size
ignore some metadata structure errors
automatically restore metadata from change logs
(pro only) start without metadata (used to start additional masters)
produce more verbose output
even more verbose output
how long to wait for lockfile (in seconds; default is 1800 seconds)
tells master to perform one of the following actions:
Start master process if the process is not already running, otherwise display error message.
Stop master process if the process is running, otherwise display error message.
(default action) If the master process is running, restart it, if it's not running, start it.
Send a signal to master process to reload config files.
Send a singal to master process to dump debug information file in working directory.
Displays "mfsmaster pid: PID" if the master is running (and return 0) or "mfsmaster is not running" otherwise (and return 1).
Send termination signal to master process.
Restore current metadata file using backup metadata and changlog files (if possible, i.e. if correct files exist), write it to working directory and exit.

FILES

configuration file for MooseFS master process; refer to mfsmaster.cfg(5) manual for details
MooseFS access control file; refer to mfsexports.cfg(5) manual for details
Network topology definitions; refer to mfstopology.cfg(5) manual for details
Chunkservers IP mapping definitions; refer to mfsipmap.cfg(5) manual for details
.mfsmaster.lock
lock file of running MooseFS master process (created in data directory)
.bgwriter.lock
lock file of running MooseFS master subprocess for storing metadata (created in data directory)
MooseFS filesystem metadata image (created in data directory)
CRC of metadata.mfs file (created in data directory)
An empty metadata file, to be used when starting up a fresh MooseFS instance (created in data directory)
MooseFS filesystem metadata change logs (created in data directory)
master charts stats (created in data directory)
.mfsmaster_info.txt
master info file, created by sending the process INFO signal, with work parameters that can be used for debugging/support purposes (created in data directory)

REPORTING BUGS

Report bugs to <bugs@moosefs.com>.

COPYRIGHT

Copyright (C) 2025 Jakub Kruszona-Zawadzki, Saglabs SA

This file is part of MooseFS.

MooseFS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2 (only).

MooseFS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with MooseFS; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301, USA or visit http://www.gnu.org/licenses/gpl-2.0.html

SEE ALSO

mfschunkserver(8), mfsmount(8), mfsmaster.cfg(5), mfsexports.cfg(5), mfstopology.cfg(5)

October 2025 MooseFS 4.58.1-1