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Install MongoDB on Mac OS X 10.9

Install MongoDB with Homebrew

brew install mongodb
mkdir -p /data/db

Set permissions for the data directory

Ensure that user account running mongod has correct permissions for the directory:

sudo chmod 0755 /data/db
sudo chown $USER /data/db

Run MongoDB!

iTerm buffer 1: mongod
iTerm buffer 2: mongo

Note: If you get something like this:

exception in initAndListen: 10309 Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied Is a mongod instance already running?, terminating

It means that /data/db lacks required permission and ownership.

Run ls -ld /data/db/

Output should look like this (gibber is directory owner and wheel is group to which gibber belongs):

drwxr-xr-x  7 gibber  wheel  238 Aug  5 11:07 /data/db/
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