Follow this Heroku Article.

Once your are done with above article follow bellow to use puma as production server.

By default heroku runs webrick on production.

Add some code  in your static website you can use Puma ad your production server.

Add puma and foreman in your Gemfile

Than run bundle install to install above gems.

Now Add Procfile at root of your application

> cat Procfile

Set Puma as the server for your web process in the Procfile of your application. You can set most values inline:

web: bundle exec puma -t 5:5 -p ${PORT:-3000} -e ${RACK_ENV:-production}

Now you are done. Just commit your code and deploy to heroku.

Here you will see now heroku is using Puma as application server.

Digital Ocean referral


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