From: http://www.meteorpedia.com/read/Environment_Variables
- BIND IP: bind to a specific IP address (optional)
- DISABLE WEBSOCKETS: Set to 1 to disable trying websockets first before falling back to sockjs emulation
- HTTP_FORWARDED_COUNT: set this with the number of proxies Meteor is running behind (optional)
- MAIL_URL: how Meteor will send email, SMTP settings etc. (required to send email)
- METEOR_SETTINGS: various runtime settings, see link (optional)
- MONGO_OPLOG_URL: URL for Mongo (optional)
- MONGO_URL: URL for connecting to Mongo (required in production)
- NODE_ENV: not required by Meteor but set to ‘PRODUCTION’ by most node.js PaaS providers.
- NODE_OPTIONS: Used in development (i.e. via Meteor-run) to pass additional options to node (like –debug). Optional.
- PACKAGE_DIRS: If you wish to add packages outside of your application folder structure, set it to directory containing the packages. If more than one location, use colon to delimit the list. (optional)
- PORT: What port to listen on (optional, defaults to 3000)
- ROOT_URL: Default URL for how your app should be access (required on production)
Setting ROOT_URL in C9 fixes issues with Google login redirection.