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Asked: 2026-06-14T21:49:54+00:00

I’m new to MongoDB, and I’m trying to run mongod . If I type

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I’m new to MongoDB, and I’m trying to run mongod. If I type in mongo, I can run the shell (and then I exit nicely with ^C), but when I try typing mongod, I get this:

mongod --help for help and startup options
Sat Nov 24 13:42:34 [initandlisten] MongoDB starting : pid=99910 port=27017 dbpath=/data/db/ 64-bit host=Macbook-err.local
Sat Nov 24 13:42:34 [initandlisten] 
Sat Nov 24 13:42:34 [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
Sat Nov 24 13:42:34 [initandlisten] db version v2.2.1, pdfile version 4.5
Sat Nov 24 13:42:34 [initandlisten] git version: nogitversion
Sat Nov 24 13:42:34 [initandlisten] build info: Darwin 172-26-13-128.dynapool.nyu.edu 12.2.0 Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49
Sat Nov 24 13:42:34 [initandlisten] options: {}
Sat Nov 24 13:42:34 [initandlisten] journal dir=/data/db/journal
Sat Nov 24 13:42:34 [initandlisten] recover : no journal files present, no recovery needed
Sat Nov 24 13:42:34 [websvr] ERROR: listen(): bind() failed errno:48 Address already in use for socket: 0.0.0.0:28017
Sat Nov 24 13:42:34 [websvr] ERROR:   addr already in use
Sat Nov 24 13:42:34 [initandlisten] ERROR: listen(): bind() failed errno:48 Address already in use for socket: 0.0.0.0:27017
Sat Nov 24 13:42:34 [initandlisten] ERROR:   addr already in use
Sat Nov 24 13:42:34 [initandlisten] now exiting
Sat Nov 24 13:42:34 dbexit: 
Sat Nov 24 13:42:34 [initandlisten] shutdown: going to close listening sockets...
Sat Nov 24 13:42:34 [initandlisten] shutdown: going to flush diaglog...
Sat Nov 24 13:42:34 [initandlisten] shutdown: going to close sockets...
Sat Nov 24 13:42:34 [initandlisten] shutdown: waiting for fs preallocator...
Sat Nov 24 13:42:34 [initandlisten] shutdown: lock for final commit...
Sat Nov 24 13:42:34 [initandlisten] shutdown: final commit...
Sat Nov 24 13:42:34 [initandlisten] shutdown: closing all files...
Sat Nov 24 13:42:34 [initandlisten] closeAllFiles() finished
Sat Nov 24 13:42:34 [initandlisten] journalCleanup...
Sat Nov 24 13:42:34 [initandlisten] removeJournalFiles
Sat Nov 24 13:42:34 [initandlisten] shutdown: removing fs lock...
Sat Nov 24 13:42:34 dbexit: really exiting now

This seems to be a common problem around here, and I’ve tried:
deleting the mongod.lock file rm /data/db/mongod.lock
repair: mongod --repair
killing processes: killall -15 mongod and killall -9 mongod
I tried changing permissions: sudo chmod 0755 /data/db and sudo chown $USER /data/db

My permissions seem correct:

drwxr-xr-x  4 slaffont  wheel  136 Nov 24 13:28 /data/db/

I’ve run out of ideas. Has anyone else had this problem? What should I do? 🙁

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1 Answer

  1. Editorial Team

    From your main comments, it seems you installed MongoDB via macports (given the /opt install location). What I believe might be happening is that the recipe for macports installed MongoDB as a launchd service.

    Check this location for a mongodb related plist file: /Library/LaunchDaemons
    If you find it, that means your system will automatically keep this service running. If you only want to run the mongod manually, then remove this plist and reboot. Or you can try this command:
    launchctl unload /Library/LaunchDaemons/path.to.mongo.plist

    Otherwise, run another instance of mongod on a different port.

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