mfsmetalogger(8)

📦
version 4.59.2 · 6 versions
, in arch rolling, nixos 26.05, nixpkgs unstable, ubuntu stonking

💖 mfsmetalogger(8) 💖

okay bestie, gather round, we're talking about mfsmetalogger — this is part of MooseFS, and it's literally the metadata replication server of MooseFS. she replicates metadata. that's the whole vibe. 🦋

✨ NAME ✨

mfsmetalogger — start, restart or stop MooseFS metalogger process

🌸 SYNOPSIS 🌸

mfsmetalogger [-c CFGFILE] [-f] [-d] [-u] [-n] [-t LOCKTIMEOUT] [ACTION]

mfsmetalogger -v

mfsmetalogger -h

🎀 DESCRIPTION 🎀

okay so. mfsmetalogger is the metadata replication server of MooseFS. that's her job, that's her whole thing, she's the girl who keeps the metadata copies. no cap. 👑

💅 OPTIONS 💅

  • -v — print version information and exit. she tells you who she is and dips. iconic.
  • -h — print usage information and exit. help menu, but make it cute.
  • -c CFGFILE — specify alternative path of configuration file (default is mfsmetalogger.cfg in the system configuration directory). you want a different config? say less.
  • -f — run in foreground, don't daemonize. she stays right there in your terminal like a loyal bestie. 🫶
  • -d — run with dangerous options (names: DANGEROUS_*). ⚠️ yes bestie, dangerous is right there in the name, this is not a drill.
  • -u — log undefined configuration values (when default is assumed). for when you wanna know what she had to guess at. 🕵️
  • -n — do not attempt to increase limit of core dump size.
  • -t LOCKTIMEOUT — how long to wait for lockfile (in seconds; default is 60 seconds). she will wait, but only so long. she has boundaries. ✋

🌈 ACTION 🌈

ACTION tells metalogger to perform one of the following actions:

  • start — Start metalogger process if the process is not already running, otherwise display error message. (she's already up, don't be extra.)
  • stop — Stop metalogger process if the process is running, otherwise display error message. (nothing to stop, nothing to say.)
  • restart — (default action) If the metalogger process is running, restart it, if it's not running, start it. the "idk just handle it" of actions. 💫
  • reload — Send a signal to metalogger process to reload config files. glow-up for the config. ✨
  • info — Send a signal to metalogger process to dump debug information file in working directory.
  • test — Displays mfsmetalogger pid: PID if the metalogger is running (and return 0) or mfsmetalogger is not running otherwise (and return 1). vibe check but for processes. 🔍
  • kill — Send termination signal to metalogger process. 💀
  • restore — Not implemented. girl said "not today", and honestly? respect.

🎀 FILES 🎀

  • mfsmetalogger.cfg — configuration file for MooseFS metalogger process; refer to mfsmetalogger.cfg(5) manual for details.
  • .mfsmetalogger.lock — lock file of running MooseFS metalogger process (created in data directory).
  • changelog_ml.*.mfs — MooseFS filesystem metadata change logs (backup of master change log files, created in data directory).
  • metadata.ml.mfs.back — Latest copy of complete metadata.mfs.back file from MooseFS master (created in data directory).
  • .mfsmetalogger_info.txt — metalogger 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 😭

found a bug? 🐛 do NOT suffer in silence, tell the girlies. Report bugs to <bugs@moosefs.com>.

Copyright (C) 2026 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 this program; if not, see <https://www.gnu.org/licenses/>.

🔥 SEE ALSO 🔥

mfsmaster(8), mfsmetalogger.cfg(5)

and that's the whole page bestie, you ate it, go replicate some metadata 💖 this was MooseFS 4.59.2-1, from May 2026, mwah 🎀✨

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