I\'ve recently deployed my Meteor app to a Digital Ocean droplet running Ubuntu 14.04 x32. I used Meteor Up with this mup.json file:
It's because you did not set the MONGO_URL in the "env" object.
// Configure environment
"env": {
"PORT": 58090, # Your application port
"ROOT_URL": "http://localhost/",
"MONGO_URL": "mongodb://username:password@127.0.0.1:27017/myDatabase",
"METEOR_ENV": "production" # If you need to separate your local environment from production
},
Then, just run mup deploy.