gistfile1.sh

# 1. Create a new file at /Library/LaunchDaemons/org.mongo.mongod.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>org.mongo.mongod</string>
	<key>RunAtLoad</key>
	<true/>
	<key>ProgramArguments</key>
	<array>
		<string>/usr/local/bin/mongod</string>
		<string>--dbpath</string>
		<string>/var/lib/mongodb/</string>
		<string>--logpath</string>
		<string>/var/log/mongodb.log</string>
	</array>
</dict>
</plist>

# 2. Create the log file and DB Directory

sudo touch /var/log/mongodb.log
sudo mkdir /var/lib/mongodb

# 3. Change ownership, and load the plist into launchctl, then start mongod through launchctl

sudo chown root:wheel /Library/LaunchDaemons/org.mongo.mongod.plist
sudo launchctl load /Library/LaunchDaemons/org.mongo.mongod.plist
sudo launchctl start org.mongo.mongod