/Meteor 1.5

Environment Variables

List of environment variables that you can use with your Meteor application.

Here’s a list of the environment variables you can provide to your application.



Bind the application server to a specific network interface by IP address, for example: BIND_IP=

See also: PORT.

In development, this can be accomplished with meteor run --port a.b.c.d:port.


(development, production)

In the event that your own deployment platform does not support WebSockets, or you are confident that you will not benefit from them, setting this variable with DISABLE_WEBSOCKETS=1 will explicitly disable WebSockets and forcibly resort to the fallback polling-mechanism, instead of trying to detect this automatically.



Set this to however many number of proxies you have running before your Meteor application. For example, if have an NGINX server acting as a proxy before your Meteor application, you would set HTTP_FORWARDED_COUNT=1. If you have a load balancer in front of that NGINX server, the count is 2.


(development, production)

Use this variable to set the SMTP server for sending e-mails. Postmark, Mandrill, MailGun and SendGrid (among others) are companies who can provide this service. The MAIL_URL contains all of the information for connecting to the SMTP server and, like a URL, should look like smtp://user:[email protected]:587 or smtps://user:[email protected]:465.

The smtp:// form is for mail servers which support encryption via STARTTLS or those that do not use encryption at all and is most common for servers on port 587 and sometimes port 25. On the other hand, the smtps:// form (the s stands for “secure”) should be used if the server only supports TLS/SSL (and does not support connection upgrade with STARTTLS) and is most common for servers on port 465.



When running your bundled application in production mode, pass a string of JSON containing your settings with METEOR_SETTINGS='{ "server_only_setting": "foo", "public": { "client_and_server_setting": "bar" } }'.

In development, this is accomplished with meteor --settings [file.json] in order to provide full-reactivity when changing settings. Those settings are simply passed as a string here. Please see the Meteor.settings documentation for further information.


(development, production)

MongoDB server oplog URL. If you’re using a replica set (which you should), construct this url like so: MONGO_OPLOG_URL="mongodb://user:[email protected]:10139/local?replicaSet=(your replica set)&authSource=(your auth source)"


(development, production)

MongoDB server URL. Give a fully qualified URL (or comma-separated list of URLs) like MONGO_URL="mongodb://user:[email protected]:10139". For more information see the MongoDB docs.


(development, production)

Colon-delimited list of local package directories to look in, outside your normal application structure, for example: METEOR_PACKAGE_DIRS="/usr/local/my_packages/". Note that this used to be PACKAGE_DIRS but was changed in Meteor 1.4.2.



Which port the app should listen on, for example: PORT=3030

See also: BIND_IP.

In development, this can be accomplished with meteor run --port <port>.


(development, production)

Used to generate URLs to your application by, among others, the accounts package. Provide a full URL to your application like this: ROOT_URL="https://www.myapp.com".

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