Visual Studio 2017 has been released and the features are great for Windows developers. However along with it comes .NET Core 1.0 tooling and large improvements to the command line experience for macOS and Linux users developing ASP.NET Core applications.
One of the prevalent features shown off in VS 2017 is the Docker support and capabilities to push to Azure App Service.
Using the Azure CLI 2.0, Docker and .NET CLI these same capabilities can be accomplished without friction and with just as much success and satisfaction.
The new command now is driven by a whole new template system. A number of new templates, including webapi, are available with the ability to install and create custom ones.
Read more about
dotnet new and the dotnet CLI at Exploring the new dotnet cli.
Install the ASP.NET Core Spa Templates for
dotnet new using the following command.
dotnet new --install Microsoft.AspNetCore.SpaTemplates::*
Now you can use
dotnet new angular to create a new Angular application. React, Aurelia, and Knockout are also included in the templates installed with SpaTemplates.
Creating a new Angular app
If there is a piece of advice when using any CLI (Command Line Interface), it is to first look at the
-h|--help and inspect the options that are available. If there is not documentation available;
--help can be a great place to find some 'er help.
The option we will use here is
-n|--name which sets the name of the application and the location or folder. It is a preference for me as I tend to forget to create the folder and
dotnet new angular -n aspnetcoreweb
dotnet restore to install the NuGet dependencies.
To install the client-side dependencies, run
npm install to download the packages defined in package.json prior to running the application.
Start the application with
ASPNETCORE_ENVIRONMENT=Development dotnet run
Add Docker support
The Dockerfile assumes the app has been published into the published folder. To achieve this, use
dotnet publish -o published -c Release
dotnet new templates do not come with Dockerfiles out of the box. However, adding what is needed for this project is minimal.
Add a new file named
Dockerfile to the root of your project with the following contents.
# base image for ASP.NET Core # automatically exposes PORT 80 FROM microsoft/aspnetcore:1.1.1 # install nodejs for angular, webpack middleware RUN apt-get update RUN apt-get -f install RUN apt-get install -y wget RUN wget -qO- https://deb.nodesource.com/setup_6.x | bash - RUN apt-get install -y build-essential nodejs # set the working directory WORKDIR /app # set the environment to Production ENV ASPNETCORE_ENVIRONMENT Production # copy the published folder created using # dotnet publish -o published -c Release COPY published ./ # set the entrypoint of the application ENTRYPOINT ["dotnet", "aspnetcoreweb.dll"]
To make your build context as small as possible add a .dockerignore file to the root folder of your project with the following contents.
Create the Docker image for your application using the tag
-t option to set the name of the image. This should correspond to the dockerhub-username/dockerhub-repositoryname. Create an account at http://hub.docker.com
docker build -t spboyer/aspnetcoreweb .
docker images from terminal to verify that the image was built with the tag. In my case I have
spboyer/aspnetcoreweb with a
TAG of latest.
Login and push image to Docker hub.
$ docker login $ docker push spboyer/aspnetcore:latest
The Azure CLI 2.0 is Azure's new command line experience for managing Azure resources. It runs on Windows, macOS and Linux. Get the installer for your OS here.
Login using command line. If you have two factor authentication, this method doesn't work*
az login -u <username> -p <password>
Creating a web app on Azure with a custom Docker image
The following bash script creates a resource group, an AppService plan, and the web app on the using Linux. The final command configures the web app container to use the Docker image we pushed to Docker hub.
#/bin/bash # Variables appName="aspnetcore-docker" location="WestUS" dockerHubContainerPath="spboyer/aspnetcore:latest" resourceGroup="aspnetcore-docker" plan="AppServiceDocker" # Create a Resource Group az group create --name $resourceGroup --location $location # Create an App Service Plan az appservice plan create --name $plan --resource-group $resourceGroup --location $location --is-linux --sku S1 # Create a Web App az appservice web create --name $appName --plan $plan --resource-group $resourceGroup # Configure Web App with a Custom Docker Container from Docker Hub az appservice web config container update --docker-custom-image-name $dockerHubContainerPath --name $appName --resource-group $resourceGroup