Как запустить mongo shell?

MongoDB shell version: 3.0.2
connecting to: test
2015-04-20T01:09:39.216+0300 W NETWORK  Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2015-04-20T01:09:39.219+0300 E QUERY    Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed
    at connect (src/mongo/shell/mongo.js:179:14)
    at (connect):1:6 at src/mongo/shell/mongo.js:179
exception: connect failed