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node.jsherokupm2

How to specify a port number for pm2

I'm trying to use pm2 to manage a node.js cluster

pm2 start . -i 3

I'm currently running the app on heroku and using a Procfile with the above command, but I cannot figure out how to configure pm2 to use the existing PORT env var. Something like pm2 start . -p $PORT

What am I missing?

Solution

  • You can use an environment variable. For example:

    1. NODE_PORT=3002 pm2 start -i 0 app.js

    2. Here is how to read the value in app:

    console.log(process.env.NODE_PORT);

    Or, if you are building an Express app:

    1. PORT=3002 pm2 start -i 0 ./bin/www

    2. Express loads PORT automatically when the application starts.