How to install Mongo Db in a dev environment

Here's a good article: https://briancaos.wordpress.com/2014/10/01/sitecore-and-xdb-setting-up-mongodb-on-your-developer-machine/

Make sure you have the following in your ConnectionStrings.config :

  <add name="analytics" connectionString="mongodb://localhost/analytics" />
  <add name="tracking.live" connectionString="mongodb://localhost/tracking_live" />
  <add name="tracking.history" connectionString="mongodb://localhost/tracking_history" />
  <add name="tracking.contact" connectionString="mongodb://localhost/tracking_contact" />