OS X start service at boot
To run a command on start up on OS X, you need to use launchd with an XML service definition.
This is an XML file, so you can do it with your favorite text editor or alternatively you can use the Property List Editor that's installed with the Mac OS X Dev Tools. Create the following:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>some.meaningful.name</string> <!-- org.mongodb.mongodb perhaps? --> <key>OnDemand</key> <false/> <key>UserName</key> <string>anAppropriateUser</string> <key>GroupName</key> <string>anAppropriateGroup</string> <key>ProgramArguments</key> <array> <string>/Applications/MongoDB/bin/mongod</string> <string>--dbpath</string> <string>/usr/local/mongo/data</string> <string>--fork</string> <string>--logpath</string> <string>/usr/local/mongo/log</string> </array> </dict> </plist>
Save this in /Library/LaunchAgents/some.meaningful.name.plist (you will need an administrator account and/or sudo), then open a terminal and do:
sudo launchctl load /Library/LaunchAgents/some.meaningful.name.plist
This will cause launchd to load the item which will cause it to start MongoDB on boot. As a bonus, launchd will monitor it and, if it exits for any reason, it will be re-started. To get rid of the item simply replace load in the above command with unload.
sudo launchctl unload /Library/LaunchAgents/some.meaningful.name.plist