Hosting ASP.Net Core app on Heroku using Docker
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Today I want to make a small and simple blog post about how to deploy ASP.Net Core application to Heroku using Docker.
Requirements
- Docker
- Heroku CLI (you will need registered Heroku account)
- ASP.Net Core application you want to deploy (I will use the one we've createdhere)
Create Heroku App
To start, we need to create a blank app from Heroku like this
Choose the name you like and then we are good to go.
Setup Dockerfile
Re-use dockerfile frommy previous post
# First we add a dotnet SDK image to build our app inside the container FROM microsoft/dotnet:sdk AS build-env WORKDIR /app # Copy csproj and restore as distinct layers COPY *.csproj ./ RUN dotnet restore # Copy everything else and build COPY . ./ RUN dotnet publish -c Release -o out # Here we use ASP.NET Core runtime to build runtime image FROM microsoft/dotnet:aspnetcore-runtime WORKDIR /app COPY --from=build-env /app/out . CMD ASPNETCORE_URLS=http://*:$PORT dotnet NetCoreExample.dll
NOTE : Because Heroku doesn’t work nicely with ENTRYPOINT command we should change this:
ENTRYPOINT ["dotnet", "NetCoreExample.dll"]
to this:
CMD ASPNETCORE_URLS=http://*:$PORT dotnet NetCoreExample.dll
And don't forget to change NetCoreExample.dll
to the name of your application.
Deploy Docker Container to Heroku
First, we need to login to Heroku and Heroku container using these commands:
$ heroku login $ heroku container:login
While I was doing this, I was constantly getting an error "docker: Got permission denied while trying to connect to the Docker...". If you also get this error, check this StackOverflow question.
Now we should build Docker image using this command:
$ docker build -t netcoreexample .
Where netcoreexample
is the name of your app.
We need to tag the heroku target image
$ docker tag netcoreexample registry.heroku.com/test-app-docker/web
Where test-app-docker
is the name of the Heroku app, we've created on the first step.
Push the docker image to Heroku registry
$ docker push registry.heroku.com/test-app-docker/web
And finally deploy it!
$ heroku container:release web -a test-app-docker
Now if you will open link that loos like https://{your-app-name}.herokuapp.com/ you will be able to access you web app.
Summary
Now you can use only 4 commands to deploy your application to Heroku. In future you can add CI system and configure it to do them for you ;)
Thank you for reading and Happy Coding!
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