I’ll explain how to deploy your code to each platform and we’ll end the article with a short summary of the pros and cons. I’ll pay attention to options for monitoring, ease of use, offered functionality and what the free hosting plan includes.
Deployment with Heroku
Before we can start, we need to add some code to the
Procfile. Heroku makes use of this file to determine how to execute the uploaded code.
The following code needs to be added to the file so Heroku knows what command should be executed to start the app:
web: node app.js
Once this is done, try to log in from the terminal by typing
heroku login. Heroku will ask you to enter your login credentials.
Next, navigate to the root of your project and enter the command:
heroku create. This creates an app on Heroku which is ready to receive the source code of your project. The name of the app on Heroku is randomly created.
To deploy our code to Heroku, simply use
git push heroku master. We can visit the app with the command
heroku open which will open the generated URL.
Pushing changes to Heroku
Changes can be pushed by following the normal Github flow:
git add . git commit -m "Changes made to app" git push heroku master heroku open
Useful Heroku Commands
To make sure that at least one instance of the app is running:
heroku ps:scale web=1
Because we are using the free platform, it is not possible to upscale your application. However, it is possible to downscale so no instances of the application are running:
heroku ps:scale web=0
View the latest logs (stream) in chronological order generated by Heroku:
heroku logs --tail
It’s also possible to show the app logs only. App logs are the output of
console.log()statements in your code and can be viewed with
heroku logs --source app-name
Heroku provides the possibility to run your app locally at http://localhost:5000:
heroku local web
List all Heroku apps:
Remove a deployment:
heroku apps:destroy --app app-name
Add owner (account) to access the app:
heroku access:add email@example.com, same for removing
heroku access:remove firstname.lastname@example.org
Heroku Environment Variables
If you are working with a
.env file locally, you might want to use other environment variables for your Heroku deployment. It is possible to set these with
heroku config:set PORT=3001. These values overwrite the variables set in you
To see all defined Heroku environment variables, just use
heroku config. If you want to remove an environment variable for e.g.
heroku config:unset PORT.
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