If you are seeing Mongo soft rlimits warnings in your logs, or a WARNING: soft rlimits too low. Number of files is 256, should be at least 1000 when you login to mongo shell via mongo from the commandline, or any mysterious/unexplained mongo connection errors... follow this how-to exactly and it will resolve the issue for you.
(Source of this how to found at basho/basho_docs#1402)
First file:
sudo vi /Library/LaunchDaemons/limit.maxfiles.plist
...containing:
| // A global file to provide the countries and cities | |
| exports.countries = [{ | |
| name: 'Australia', | |
| cities: ['Melbourne', 'Sydney', 'Canberra'] | |
| }, { | |
| name: 'España', | |
| cities: ['Madrid', 'Barcelona', 'Sevilla'] | |
| }, { | |
| name: 'Italia', |
| /** | |
| * A function to take a string written in dot notation style, and use it to | |
| * find a nested object property inside of an object. | |
| * | |
| * Useful in a plugin or module that accepts a JSON array of objects, but | |
| * you want to let the user specify where to find various bits of data | |
| * inside of each custom object instead of forcing a standardized | |
| * property list. | |
| * | |
| * @param String nested A dot notation style parameter reference (ie "urls.small") |