CMOGSTORED(1) User Commands CMOGSTORED(1)NAMEcmogstored - manual page for cmogstored 1.5.0
SYNOPSIScmogstored [OPTION...]
DESCRIPTIONcmogstored-- alternative mogstored implementation for MogileFS
--config=<file>
Set config file (no default, unlike mogstored)
-d, --daemonize
Daemonize
--docroot=<path>
Docroot above device mount points. Defaults to /var/mogdata
--httplisten=<ip:port> IP/Port HTTP server listens on
--maxconns=<number>
Number of simultaneous clients to serve. Default 10000
--mgmtlisten=<ip:port> IP/Port management/sidechannel listens on
--pidfile=<path>
path to PID file
-?, --help
give this help list
--usage
give a short usage message
-V, --version
print program version
ENVIRONMENT
MOG_IOSTAT_CMD - command-line for invoking iostat(1). This is used by
the sidechannel to report disk utilization to trackers. Default:
"iostat -dx 1 30"
LISTEN_FDS, LISTEN_PID - may be used for systemd-style socket activa‐
tion regardless of whether systemd is on the system. See sd_lis‐
ten_fds(3) for more information. Since cmogstored supports two proto‐
cols on different sockets, the command line or config file must still
specify which addresses to listen on. This feature is available in
cmogstored 1.5.0 and later.
CMOGSTORED_FD - a comma-delimited list of integer file descriptors.
This is used internally for SIGUSR2 upgrades, but may be specified at
startup (e.g. via env(1)) as it is not tied to LISTEN_PID like LIS‐
TEN_FDS is. Unlike LISTEN_FDS, CMOGSTORED_FD does not rely on inher‐
ited file descriptors being contiguous.
See MALLOC TUNING for environment variables which may affect memory
usage.
SIGNALS
SIGQUIT - gracefully shutdown the server SIGUSR2 - upgrade executable
on the fly
UPGRADING
Upgrading cmogstored on-the-fly is possible since version 1.2.0. The
procedure is close to the one used by nginx users: send SIGUSR2 fol‐
lowed by SIGQUIT to the old process. Use of SIGWINCH and SIGHUP are
currently not supported (but may be in the future). Procedures for the
nginx upgrade are documented here: http://wiki.nginx.org/Command‐
Line#Upgrading_To_a_New_Binary_On_The_Fly
MALLOC TUNINGmalloc(3) implementations tuned for multithreading speed (and not mem‐
ory usage) may cause large amounts of metadata overhead in infre‐
quently-used arenas. While cmogstored may use many threads for
filesystem I/O, cmogstored is designed to not be dependent on malloc(3)
performance nor scalability.
On GNU/Linux systems with glibc, we recommend setting MALLOC_ARENA_TEST
and MALLOC_ARENA_MAX to low numbers to limit the number arenas. Set‐
ting the value of each to 1 or 2 should be enough, even.
REPORTING BUGS
Only bug reports in plain-text email will be read. Please email to
either the public cmogstored mailing list <cmogstored-pub‐
lic@bogomips.org> or the public MogileFS mailing list <mogile@google‐
groups.com>.
Report bugs to cmogstored-public@bogomips.org.
COPYRIGHT
Copyright (C) 2012-2015 all contributors <cmogstored-pub‐
lic@bogomips.org> License: GNU GPL version 3 or later
<https://www.gnu.org/licenses/gpl.html>. This is free software: you
are free to change and redistribute it. There is NO WARRANTY, to the
extent permitted by law.
SEE ALSOcmogstored website: http://bogomips.org/cmogstored/README You can learn
more about MogileFS: http://mogilefs.org/
cmogstored source code is available via git:
git clone git://bogomips.org/cmogstored.git
cmogstored 1.5.0 November 2015 CMOGSTORED(1)
