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--- | ||
title: Migrating ASP.NET MVC Applications to Windows Containers | ||
description: Learn how to take an existing ASP.NET MVC application and run it in a Windows Docker Container | ||
keywords: Windows Containers, Docker, ASP.NET MVC | ||
author: BillWagner | ||
ms.author: wiwagn | ||
ms.date: 02/01/2017 | ||
ms.topic: article | ||
ms.prod: .net-framework | ||
ms.technology: dotnet-mvc | ||
ms.devlang: dotnet | ||
ms.assetid: c9f1d52c-b4bd-4b5d-b7f9-8f9ceaf778c4 | ||
uid: mvc/overview/deployment/docker | ||
--- | ||
# Migrating ASP.NET MVC Applications to Windows Containers | ||
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Running an existing .NET Framework-based application in a Windows container doesn't require any changes to your app. To run your app in a Windows container you create a Docker image containing your app and | ||
start the container. This topic explains | ||
how to take an existing [ASP.NET MVC application](http://www.asp.net/mvc) | ||
and deploy it in a Windows container. | ||
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You start with an existing ASP.NET MVC app, then build the published assets using Visual Studio. You use Docker | ||
to create the image that contains and runs your app. You'll browse to the site running in a Windows container and verify the app is | ||
working. | ||
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This article assumes a basic understanding of Docker. You can learn about Docker by reading the [Docker Overview](https://docs.docker.com/engine/understanding-docker/). | ||
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The app you'll run in a container is a simple website that | ||
answers questions randomly. This app is a basic MVC application | ||
with no authentication or database storage; it lets you focus | ||
on moving the web tier to a container. Future topics will show how to | ||
move and manage persistent storage in containerized applications. | ||
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Moving your application involves these steps: | ||
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1. [Creating a publish task to build the assets for an image.](#publish-script) | ||
1. [Building a Docker image that will run your application.](#build-the-image) | ||
1. [Starting a Docker container that runs your image.](#start-a-container) | ||
1. [Verifying the application using your browser.](#verify-in-the-browser) | ||
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The [finished application](https://github.com/dotnet/docs/tree/master/samples/framework/docker/MVCRandomAnswerGenerator) is on GitHub. | ||
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## Prerequisites | ||
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The development machine must be running | ||
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- [Windows 10 Anniversary Update](https://www.microsoft.com/en-us/software-download/windows10/) (or higher) or [Windows Server 2016](https://www.microsoft.com/en-us/cloud-platform/windows-server) (or higher). | ||
- [Docker for Windows](https://docs.docker.com/docker-for-windows/) - version Stable 1.13.0 or 1.12 Beta 26 (or newer versions) | ||
- [Visual Studio 2015](https://www.visualstudio.com/en-us/visual-studio-homepage-vs.aspx). | ||
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> [!IMPORTANT] | ||
> If you are using Windows Server 2016, follow the | ||
> instructions for [Container Host Deployment - Windows Server](https://msdn.microsoft.com/virtualization/windowscontainers/deployment/deployment). | ||
After installing and starting Docker, right-click on the | ||
tray icon and select **Switch to Windows containers**. This is required to run | ||
Docker images based on Windows. This command takes a few seconds to | ||
execute: | ||
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![Windows Container][windows-container] | ||
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## Publish script | ||
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Collect all the assets that you need to load into | ||
a Docker image in one place. You can use the Visual Studio | ||
**Publish** command to create a publish profile for your app. This | ||
profile will put all the assets in one directory tree that you copy to your target image later in this tutorial. | ||
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**Publish Steps** | ||
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1. Right click on the web project in Visual Studio, and select **Publish**. | ||
1. Click the **Custom profile button**, and then select **File System** as the method. | ||
1. Choose the directory. By convention, the downloaded sample uses `bin/PublishOutput`. | ||
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![Publish Connection][publish-connection] | ||
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Open the **File Publish Options** section of the **Settings** tab. Select | ||
**Precompile during publishing**. This optimization means that you'll be | ||
compiling views in the Docker container, you are copying the precompiled | ||
views. | ||
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![Publish Settings][publish-settings] | ||
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Click **Publish**, and Visual Studio will copy all the needed assets to the destination folder. | ||
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## Build the image | ||
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Define your Docker image in a Dockerfile. The Dockerfile contains instructions | ||
for the base image, additional components, the app you | ||
want to run, and other configuration images. The Dockerfile is the input | ||
to the `docker build` command, which creates the image. | ||
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You will build an image based on the `microsft/aspnet` | ||
image located on [Docker Hub](https://hub.docker.com/r/microsoft/aspnet/). | ||
The base image, `microsoft/aspnet`, is a Windows Server image. In contains | ||
Windows Server Core, IIS and ASP.NET 4.6.2. When you run this image in your container, it will | ||
automatically start IIS and installed websites. | ||
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The Dockerfile that creates your image looks like this: | ||
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```console | ||
# The `FROM` instruction specifies the base image. You are | ||
# extending the `microsoft/aspnet` image. | ||
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FROM microsoft/aspnet | ||
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# Next, this Dockerfile creates a directory for your application | ||
RUN mkdir C:\randomanswers | ||
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# configure the new site in IIS. | ||
RUN powershell -NoProfile -Command \ | ||
Import-module IISAdministration; \ | ||
New-IISSite -Name "ASPNET" -PhysicalPath C:\randomanswers -BindingInformation "*:8000:" | ||
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# This instruction tells the container to listen on port 8000. | ||
EXPOSE 8000 | ||
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# The final instruction copies the site you published earlier into the container. | ||
ADD containerImage/ /randomanswers | ||
``` | ||
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There is no `ENTRYPOINT` command in this Dockerfile. You don't need one. | ||
The base image ensures that IIS starts when the container starts. | ||
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Run the Docker build command to create the image that | ||
runs your ASP.NET app. To do this, open a PowerShell | ||
window and type the following command in the solution directory: | ||
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```console | ||
docker build -t mvcrandomanswers . | ||
``` | ||
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This command will build the new image using the instructions in your | ||
Dockerfile. This may include pulling the base image from [Docker Hub](http://hub.docker.com), | ||
and then adding your app to that image. | ||
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Once that command completes, you can run the `docker images` command | ||
to see information on the new image: | ||
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```console | ||
REPOSITORY TAG IMAGE ID CREATED SIZE | ||
mvcrandomanswers latest 86838648aab6 2 minutes ago 8.104 GB | ||
``` | ||
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The IMAGE ID will be different on your machine. Now, let's run the app. | ||
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## Start a container | ||
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Start a container by executing the following `docker run` command: | ||
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```console | ||
docker run -d -p 8000:8000 --name randomanswers mvcrandomanswers | ||
``` | ||
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The `-d` argument tells Docker to start the image in detached mode. That | ||
means the Docker image runs disconnected from the current shell. | ||
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The `-p 8000:8000` argument tells Docker how to map incoming ports. In this | ||
example, we're using port 8000 on both the host and the container. | ||
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The `--name randomanswers` gives a name to the running container. You can use | ||
this name instead of the container ID in most commands. | ||
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The `mvcrandomanswers` is the name of the image to start. | ||
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## Verify in the browser | ||
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> [!NOTE] | ||
> With the current release, you can't browse to `http://localhost`. | ||
> This is a known behavior in WinNAT, and it will | ||
> be resolved in the future. Until that is addressed, you need to use | ||
> the IP address of the container. | ||
Once the container starts, find its IP address so that you | ||
can connect to your running container from a browser: | ||
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```console | ||
docker inspect -f "{{ .NetworkSettings.Networks.nat.IPAddress }}" randomanswers | ||
172.31.194.61 | ||
``` | ||
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Connect to the running container using the IPv4 address and the configured port (8000), `http://172.31.194.61:8000` | ||
in the example shown. Type that URL into your browser, and you should see the running site. | ||
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> [!NOTE] | ||
> Some VPN or proxy software may prevent you from navigating to your site. | ||
> You can temporarily disable it to make sure your container is working. | ||
The sample directory on GitHub contains a [PowerShell script](https://github.com/dotnet/docs/tree/master/samples/framework/docker/MVCRandomAnswerGenerator/run.ps1) that executes these commands for you. Open a PowerShell window, change directory to your solution directory, and type: | ||
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```console | ||
./run.ps1 | ||
``` | ||
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The command above builds the image, displays the list of images on your machine, starts a container, and displays the IP address for that container. | ||
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To stop your container, issue a `docker | ||
stop` command: | ||
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```console | ||
docker stop randomanswers | ||
``` | ||
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To remove the container, issue a `docker rm` command: | ||
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```console | ||
docker rm randomanswers | ||
``` | ||
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[windows-container]: media/aspnetmvc/SwitchContainer.png "Switch to Windows Container" | ||
[publish-connection]: media/aspnetmvc/PublishConnection.png "Publish to File System" | ||
[publish-settings]: media/aspnetmvc/PublishSettings.png "Publish Settings" |
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