Deploy Your .NET 7 Application to Heroku With Docker
Deploying a Docker image on Heroku is a straightforward process, yet certain nuances require attention. This article will provide a comprehensive, step-by-step guide to avoid setbacks.
Prerequisites:
Create your web application:
First, we will create a new MVC application with .NET Core 3.1 Framework and run it to see that everything went correctly.
If everything went well we should be able to navigate through the default address https://localhost:5001
Build your docker image:
Create a file called Dockerfile in the root of your application. And build your image.
If you’re acquainted with Docker files, you might question the absence of any port EXPOSEd. This omission is deliberate since Heroku manages the port, primarily for security considerations. Consequently, we need to modify our application code to properly receive requests on the port designated by Heroku.
Please make adjustments to your Program.cs file as demonstrated in the following example.
If you do not include line (2), you will probably get an error when you app is deploy:
Unable to start Kestrel. System.Net.Sockets.SocketException (13): Permission denied
Host your application with Heroku
Create new app:
Go to Heroku Dashboard and create your application.
Login:
First we have to install Heroku CLI on our PCs. Then log in to your Heroku account and follow the prompts to create a new SSH public key.
Log in to Container Registry:
Make sure you have Docker well configured.
Push your Docker-based app:
Build the Dockerfile in the current directory and push the Docker image. Don’t forget to specify your application name using the -a option.
Release your app:
Release the newly pushed images to deploy your app.
Check the logs:
Take a look the application logs and check that everything looks correct.
All done!
Everything ready, we already have our online application with just executing a few steps. If you need to configure environment variables you can do it in: Application> Settings> Config Vars
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