This configuration was tested on MongoDB 2.6 and maybe not compatible with other versions.

Continuing a line of configuration of the post Creating admin user on MongoDB 2.6, now we enable external access to the MongoDB.

Like everything on Linux or most, there is a folder with configuration files or the configuration file is inside the /etc folder. In this case the file name is /etc/mongodb.conf.

Edit the bind parameter to 0.0.0.0 (anyone connects) or to the specific IP you want to connect to MongoDB.

Restart the service for the changes to take effect:

$ sudo systemctl restart mongodb.service