mfsmaster

NAME

mfsmaster - start, restart or stop MooseFS master process

SYNOPSIS

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

mfsmaster -v

mfsmaster -h

DESCRIPTION

mfsmaster is the master program of MooseFS.

OPTIONS

-v

print version information and exit

-h

print usage information and exit

-f

run in foreground, don't daemonize

-d

run with dangerous options (names: DANGEROUS_*)

-u

log undefined configuration values (when default is assumed)

-n

do not attempt to increase limit of core dump size

-t LOCKTIMEOUT

how long to wait for lockfile (in seconds; default is 1800 seconds)

-c CFGFILE

specify alternative path of configuration file (default is mfsmaster.cfg in system configuration directory)

-o OPTIONOVERRIDE

override a config option - see NOTES

-i

ignore some metadata structure errors

-a

automatically restore metadata from change logs

-e

(pro only) start without metadata (used to start additional masters)

-x

produce more verbose output

-xx

even more verbose output

ACTION

tells master to perform one of the following actions:

start: Start the master process if the process is not already running, otherwise display an error message.
stop: Stop the master process if the process is running, otherwise display an error message.
restart: (default action) If the master process is running, restart it, if it's not running, start it.
reload: Send a signal to the master process to reload config files.
info: Send a signal to the master process to dump debug information file in working directory.
test: Displays "mfsmaster pid: PID" if the master is running (and return 0) or "mfsmaster is not running" otherwise (and return 1).
kill: Send a termination signal to master process.
restore: Restore current metadata file using backup metadata and changelog files (if possible, i.e. if correct files exist), write it to working directory and exit.

FILES

mfsmaster.cfg: configuration file for MooseFS master process; refer to mfsmaster.cfg (5) manual for details
mfsexports.cfg: MooseFS access control file; refer to mfsexports.cfg (5) manual for details
mfstopology.cfg: Network topology definitions; refer to mfstopology.cfg (5) manual for details
mfsipmap.cfg: 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)
metadata.mfs, metadata.mfs.back: MooseFS filesystem metadata image (created in data directory)
metadata.crc: CRC of metadata.mfs file (created in data directory)
metadata.mfs.empty: An empty metadata file, to be used when starting up a fresh MooseFS instance (created in data directory)
changelog.*.mfs: MooseFS filesystem metadata change logs (created in data directory)
stats.mfs: 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)

NOTES

All MooseFS daemons, including mfsmaster, can read configuration options from 3 sources. These sources are, in order from the most important, to the least important:
- option overrides provided in commandline as arguments
- options defined in environment variables
- options defined in the daemon's main config file (mfsmaster.cfg for mfsmaster process).

All possible configuration options are described in the manpage for the mfsmaster.cfg(5) file. Options provided in commandline are the same as in the config file (e.g. running the mfsmaster with -o INSTANCE_NAME=foobar will change the master name presented in GUI to "foobar"). Options provided in environment must be prefixed with "MFSCFG_" (e.g setting MFSCFG_INSTANCE_NAME to "foobar" in environment will change the master name presented in GUI to "foobar" if INSTANCE_NAME is not overriden in commandline).

REPORTING BUGS

Report bugs to bugs@moosefs.com

COPYRIGHT

This file is part of MooseFS.

READ THIS BEFORE INSTALLING THE SOFTWARE. BY INSTALLING, ACTIVATING OR USING THE SOFTWARE, YOU ARE AGREEING TO BE BOUND BY THE TERMS AND CONDITIONS OF MooseFS LICENSE AGREEMENT FOR VERSION 1.7 AND HIGHER IN A SEPARATE FILE. THIS SOFTWARE IS LICENSED AS PROPRIETARY SOFTWARE. YOU DO NOT ACQUIRE ANY OWNERSHIP RIGHT, TITLE OR INTEREST IN OR TO ANY INTELLECTUAL PROPERTY OR OTHER PROPRIETARY RIGHTS.