For Docker Compose to display an option to run in Visual Studio, the docker project must be the startup project. Once we have done this for both microservices, we can change back to multiple startup projects, and we need to make one final change, modifying the applicationUrl setting in launchSettings.json for Microservice2 so that it doesn't clash with Microservice1. It is acting like a git ignore file, ignoring a few files while creating a docker image. They improve the efficiency of building the final imageonly the necessary layers are rebuilt when changes occur. That said, there are some nice enhancements under the hood that make the development process even more seemless. If you exit Visual Studio it will clean up after itself and remove this container, so if you do a docker ps -a you should no longer see the microservice1 container. Run the command docker inspect [container id]. This not only lets you see the logs, but also the environment variables, browse the file system, see which ports are in use and connect to the container in a terminal window. This can be done by running the command: Then use the IPv4 address within your connection strings. If we were to run our two microservices directly from the command-line with dotnet run, they would not use IIS Express, and we'd find that only one of the two would start up as they'd both try to listen on port 5001. Click Apply. So let see by running the command in our case. The existing container that is already running will simply start running your code, which is in a mounted volume. Now we need to run this image locally. And if they don't want to use the Visual Studio tooling, they can still use regular Docker (and Docker Compose) commands to build and run the containers from the command line. That's it, now you can review + create. The dev image lacks the app contents, as Debug configurations use volume mounting to provide the iterative experience. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. You can learn more about this at the link provided at the top of the auto-generated Dockerfile. In the right-side panel, select Enable docker support and make sure the windows option is selected. That is it, our application is running in azure service. Prefix the image name with the Docker Hub username (for example, dockerhubusername/hellodockertools) if the image is pushed to the registry. Run the docker images command in the Package Manager Console (PMC) window. To start with, let's set up a very simple demo scenario. This base image includes the ASP.NET Core NuGet packages, which are just-in-time (JIT) compiled to improve startup performance. All that this package does is that it will build a container image when we build our project in Visual Studio. The tooling acquires the compile/publish image from Docker Hub (if not already in the cache). You can use the docker inspect command to see details of the mounted volumes, but again there is a helpful breakdown available here explaining what each one is for. In this post I want to give an overview of what happens when you turn on the Docker tooling in Visual Studio 2019. //EXPOSE80--->ForPortmappingwithcontainer. Change), You are commenting using your Facebook account. And when we start debugging, there will simply be one container running for each of the services in the Docker Compose YAML file. Alternatively, change the image name to include the private registry URL (for example, privateregistry.domain.com/hellodockertools) depending on the configuration. Similar to when working with Visual Studio 2017, a Dockerfile is generated with four named build stages (base, build, publish, and final). Here's the one it created for my microservice: What's nice about this Dockerfile is that it's completely standard. In the output get the value from the HostPost key (under the 80/tcp key): While the container is running you should be able to see the running and paused docker containers: To switch back to your default application launch which launches the application outside of the containers, open solution properties and amend the Single start up project back to the web application as shown: I hope you found this post useful and informative. Visual Studio 2017 and later versions support building, debugging, and running containerized ASP.NET Core apps targeting .NET Core. Once we are up and running, we can see that our application is available through http/https ports that were exposed in our Docker container. We can also see that the same container that was started when we created our application is still running. Has it made our microservice somehow dependent on Docker in order to run successfully? The port assigned to localhost can be queried with the. Open the file explorer and navigate into the project location. Docker is a self-contained image of all the artifacts used to comprise our application and architecture. In the dialog that shows, select Docker Compose: After adding the above, you will see newly created files. If they wanted to communicate with each other, we'd need to give them application settings holding the URL and port numbers they can use to find each other. If the checkbox isn't checked, a single port (80) is exposed for HTTP traffic. To do that we need a container to run this image. For more information, see Deploy a .NET app in a Windows container to Azure Service Fabric. I've chosen ports 5002 and 5003 for this example: Now when we run in VS2019, we'll see two command windows that run the microservices directly with dotnet run and both services can run simultaneously. Change). If we issue a docker image ls command we'll see that there is now a microservice1 docker image tagged dev. However, if you issue a docker ps command which shows you running containers, you might be surprised to see that this container is already running, despite not having started debugging yet. Now we can provide some more specifics for our new application. There's lots of excellent information in that document, so make sure you take some time to read through it. Shared Drives in Docker for Windows must be configured to support volume mapping and debugging. Because of the volume mapping, the debugger and app were running from the local machine and not within the container. There you can see your recently created images. Next, Select Web Application in the left side panel. I'm a Microsoft MVP and software developer based in Southampton, England, currently working as a Software Architect for NICE Systems. Mine started up on ports 44394 and 44365, and you can see configured port numbers in the Properties/launchSettings.json file for each microservice. Notice the original container is still running as of 10 minutes ago: Once the develop and debug cycle of the app is completed, the Visual Studio Container Tools assist in creating the production image of the app. You can find me on: Microsoft.VisualStudio.Azure.Containers.Tools.Targets, Microsoft Azure Developer: Deploying and Managing Containers, Microservices Architecture: Executive Briefing, Versioning and Evolving Microservices in ASP.NET Core, Microsoft Azure Developer: Implement Azure Functions (AZ-204), Azure Container Instances: Getting Started, Building Serverless Applications in Azure, Understanding and Eliminating Technical Debt, Understanding Distributed Version Control Systems, Creating Modern WPF Applications with MahApps.Metro. Based on this docker hub id, it will fetch and get the image and deploy. Run the docker ps command in PMC. Both Linux and Windows containers are supported. For this tutorial, we will select the ASP.NET Core Web Application template and click Next. If a Dockerfile already exists in the ASP.NET Core project, it's renamed to Dockerfile.original. In .NET applications, a very common required dependency is a SQL database, and I wrote a tutorial on containerizing SQL Server Express that explains how you can do that. Click Create and then select .Net Core as a framework and select .Net Core 2.2 . By projectname, it means the full name that we have given. Let see!! The port is determined by the Docker host and can be queried with the. docker build -t dockerhubid/projectname: latest . So if your microservices need to communicate with each other you'll need some kind of service discovery mechanism. Once the docker image has been created successfully, you can enter the below command to see the images. -t --> means tagging this image with the following name. So you could have one override file for local development, and one for production. First, a Dockerfile is created for you. command: docker run -p 9090:80 dockerhubid/projectname. Which means docker runs our application on a container with necessary packages for run time. There is no spam, and I'll never share your email. Multistage builds are helpful to optimize layers and keep our Dockerfile easy to maintain. In order to use Docker support for VS2019, you obviously do need Docker Desktop installed and running on your PC. A Blog About .NET and Software Development. We have created a docker image and run it in our local machine. There are two types of Docker containers available, Windows and Linux. The next step we will take is to add Docker and Docker Compose support to our application. It can be a standalone web application, a collection of APIs, or even an end-to-end application stack comprising of a web UI, web APIs, libraries and databases. The latest image has packaged the necessary app code to run the app on a host machine. If it is private, then you have to provide the username and credentials while fetching this image from azure service. Once you do this, several things will happen. The Docker view of the Output window shows the following actions taking place: The resulting Docker image of the app is tagged as dev. You can make this repository public or private. We can see the container by running docker ps from the command line. You signed in with another tab or window. When we run our application a new container isnt created, rather the output from our project is copied into the running container. If you're like me, you want to know a bit about what will happen under the hood before using a feature like this. I have become quite accustomed to the previous version however, I must admit the improvements are very intuitive. Next, install Docker For Windows. This base image includes the ASP.NET Core runtime and NuGet packages. Needs to create an azure container instance. (LogOut/ So, once deployment success, then go to the resource and pickup the DNS name and tab in browser tab. not containerized)? The default browser is launched with the debugger attached to the container using the dynamically assigned port. You will then need to enter your credentials to confirm the changes: You docker image should now be able to run within its container. Make the change, save, and refresh the browser to view the update. Visual Studio 2017 versions 15.6 and later prompt when Shared Drives aren't configured. Disclaimer: The opinions expressed herein are my own and do not represent my employers view in any way. A quick start for creating a docker image for simple web applications and hosting it into azure container service. Notice the app is running using the container: Changes to static files and Razor views are automatically updated without the need for a compilation step. Now enter the build command and wait for executing the docker file commands (which means dependencies and all other related). The preceding Dockerfile is based on the microsoft/aspnetcore image. When you run this command in our command prompt, it looks like below: Once you've pushed the docker image into the docker hub, you can visit the docker hub login and see your repository as shown below. The Docker host must be running the same container type. Here we want to select Enable Docker Support and make sure Linux is selected in the following drop-down. The docker file is used to pull dependencies (such as the .NET Core framework) from remote repositories, enable ports for your container applications, restore the .NET Framework within your application folder, build the application, then publish the final artifacts as a Docker image. That's it !!! Imagename: dockerhubid/projectname. Today I will be giving an overview of how to build a docker container and image using the tools within Visual Studio 2019. ", "what about team members using VS Code instead?". A Docker Compose file holds a list of all the containers that you want to start up together when you run your microservices application. So far we've only converted one of our microservices to use Docker, but we can still run both of them if we have the "multiple startup projects" option selected. Select ASP.Net Core Web Application --> Click Next --> Provide project name. Right-click the project in Solution Explorer and select Add > Container Orchestrator Support. Next lets take a look at how our application gets built and deployed as a container. I'm sure there must be a way to do this without switching away from multiple startup projects, but I haven't found it if there is!). If we open a browser and browse to the http port, 49558 in my case, we see that we do not get a response yet. This should be selected by default. This will bring up a dialog letting you choose either Linux or Windows as the Target OS. As explained in this blog post, the new project dialog in Visual Studio has been given an overhaul. Run the docker images command in PMC to see the list of images. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. A new Dockerfile, similar to the following, is created: Adds an element to the ASP.NET Core project's .csproj file: Adds a PackageRoot folder to the ASP.NET Core project. The basic takeaway is that this container uses volume mounts so that whenever you build a new version of your code, it doesn't need to create a new Docker image. This process can be achieved by running the below command. If you experience issues when using database connection strings that reference SQL server databases within your hosting environment within your container, then you will need to get the IP address of your hosting environment. However, this startup project is the Docker Compose project, so when we start debugging in Visual Studio, it will launch all of the services listed in our Docker Compose file. So we can move our docker image into dockerhub repository. Once this is done, we are ready to create an ASP.NET Core Docker container in Visual Studio. Next, we will be asked which container orchestrator we want to use. An override file allows you to specify additional or alternative container settings that apply to a specific environment. ", "will I still be able to run the projects normally (i.e. Kubernetes is an increasingly common choice for hosting containers in production and Docker Desktop does allow you to run a single-node local Kubernetes cluster. Here, the override file is specifying the environment variables we want to set, the ports we want to expose and the volumes that should be mounted. I currently specialize in architecting Azure based systems and audio programming. We'll again get prompted to choose an OS - I chose Linux as that's what I chose for the Docker support. This means that for each project in our solution that we enable Docker support for, we can either run it as a Docker container, or switch back to one of the alternatives (IIS Express or dotnet run) if we prefer. The answer is, this container isn't actually running microservice1 yet. a Redis cache). It will deploy our application in azure container service. #Copyourprojectfilesandbuildourrelease, //FROMmcr.microsoft.com/dotnet/core/sdk:2.2-nanoserver-1809ASbuild, //COPY["dockerdemowebapp/dockerdemowebapp.csproj","dockerdemowebapp/"], //RUNdotnetrestore"dockerdemowebapp/dockerdemowebapp.csproj", //RUNdotnetbuild"dockerdemowebapp.csproj"-cRelease-o/app, //RUNdotnetpublish"dockerdemowebapp.csproj"-cRelease-o/app, //ENTRYPOINT["dotnet","dockerdemowebapp.dll", Why SharePoint Framework (SPFx) Is Best for SharePoint Development, Basic Authentication For Azure Functions (Open API) .Net 6, Introducing Carbon - Google's New Programming Language, Onion Architecture In ASP.NET Core 6 Web API, RabbitMQ Message Queue Using .NET Core 6 Web API, Clean Architecture In ASP.NET Core Web API. Why do we use Docker images and what is their purpose in the continuous build and deployment lifecycle? Right-click the System Tray's Docker icon, select Settings, and select Shared Drives. It's just the same as you would use if you were working from Visual Studio Code instead. You need to install the docker for windows and .Net Core SDK in your machine: Open Visual Studio 2019 and create a new project. First, a new project is added to my solution, which is a "Docker Compose" project (.dcproj): The project includes an auto-generated docker-compose.yml file. Image names should be the same as we gave while creating the docker image. Once we have Docker installed and running, then we can right-click Microservice1 in the Solution Explorer, and select "Add | Docker Support". 9090 --> It is our random port number to run our application (We can give our own). The image is based on the microsoft/aspnetcore base image. After building the container, you will see the created images using the Docker command: To view generated Docker images use the following command: After our Docker container and images are created, can we run and debug them from within Visual Studio 2019? Run the docker ps command in PMC. One port is used for HTTP traffic; the other port is used for HTTPS. I went with the default of Linux. The docker images command returns intermediary images with repository names and tags identified as (not listed above). Andrew Halil is a blogger, author and software developer with expertise of many areas in the information technology industry including online and cloud based development, test driven development and devops. A Dockerfile, the recipe for creating a final Docker image, is added to the project root. The Docker container isn't rebuilt or stopped. With the http and https ports exposed, the container is primed and ready to go. Select Docker from the debug drop-down in the toolbar, and start debugging the app. When creating a new app with the ASP.NET Core Web Application project templates, select the Enable Docker Support checkbox: If the target framework is .NET Core, the OS drop-down allows for the selection of a container type. Each project simply uses the launch profile that's selected, so can run one microservice as a Docker container and one with dotnet run or IIS Express if we want. And optionally we can update the Startup.Configure method to help us differentiate between the two microservices: The "traditional" way to launch multiple microservices in Visual Studio to would be to go to "Project | Set Startup Projects..", select "Multiple Startup Projects" and set both microservices to "Start". They can refer to each other by name as Docker Compose gives them a hostname the same as the container name. If you have other team members who do not have Docker installed, they can simply continue building and running the services in the usual way. (Click the repository, go to settings and make it public). Running with Docker Compose may seem similar to simply starting multiple projects, but it does offer some additional benefits. When you hit enter, it will try to read the docker file and execute the commands which we have written. The following choices are available: The Visual Studio Container Tools add a docker-compose project to the solution with the following files: The docker-compose.yml file references the name of the image that's created when the project runs: In the preceding example, image: hellodockertools generates the image hellodockertools:dev when the app runs in Debug mode. Move the dockerfile one step backward, which means move the docker file into solution file location and open the command prompt on that location. Does this mean that we can now only build our application with Visual Studio, or only build on a machine that has Docker installed? Therefore, the delta is the size of the app code. The development experience in Visual Studio 2019 is very similar to Visual Studio 2017 as it pertains to building Docker containers. These unnamed images are produced by the multi-stage build Dockerfile. Visual Studio 2017 versions 15.8 or later add an orchestration solution only when instructed. We have to follow the docker principle. I've added "Docker Support" to my second microservice using the same technique described above, and now we can add "Container Orchestrator" support by right-clicking on one of our microservices and selecting "Add | Container Orchestrator Support". I hope this was helpful for you. What's going on here? But notice that we've also now got a reference to the Microsoft.VisualStudio.Azure.Containers.Tools.Targets NuGet package. dockerhubid --> https://hub.docker.com/ // Here you can create docker hubid. OOPS, something went wrong, it is because the docker file is not in the correct place. All that was just a bit of background on how to switch between launch profiles, but it's useful to know as there'll be a third option when we enable Docker. To build and deploy our application to the running container, we must debug using the Docker configuration profile. The Linux containers are at this time better supported and more stable, so we will be using Linux containers for our OS when building the Docker images. To change the launch profile for a project, first we need to right-click on that project in the Solution Explorer and choose "Set as Startup Project" (n.b. command: docker push dockerhubid/projectname. However, I think for beginners to Docker, the Docker Compose route is a little simpler to get started with, so I'll choose Docker Compose. There are a few options for overriding this when you are running from the command-line, but since this post is about Visual Studio, let's see how we can select which profile each of our microservices uses. Here's an example, and you'll notice that out of the box I've got two "profiles" - one that runs using IIS Express, and one (called "Microservice1") that uses dotnet run to host your service on Kestrel. "Docker is a containerization platform that packages your application". In this video, Ill explain the intricacies of building and debugging your Docker-enabled ASP.NET Core application in Visual Studio 2019. If you want different behavior based on the build configuration (for example, Debug or Release), add configuration-specific docker-compose files. Using the configuration-specific override files, you can specify different configuration settings (such as environment variables or entry points) for Debug and Release build configurations. Like in the below image. Once the command is successful, you can see the success window. So that port number we have to map with container that we created now. host-and-deploy/docker/visual-studio-tools-for-docker, Cannot retrieve contributors at this time, REPOSITORY TAG IMAGE ID CREATED SIZE, hellodockertools dev d72ce0f1dfe7 30 seconds ago 255MB, microsoft/dotnet 2.1-aspnetcore-runtime fcc3887985bb 6 days ago 255MB, REPOSITORY TAG IMAGE ID CREATED SIZE, hellodockertools dev 5fafe5d1ad5b 4 minutes ago 347MB, microsoft/aspnetcore 2.0 c69d39472da9 13 days ago 347MB, CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES, baf9a678c88d hellodockertools:dev "C:\\remote_debugge" 21 seconds ago Up 19 seconds 0.0.0.0:37630->80/tcp dockercompose4642749010770307127_hellodockertools_1, baf9a678c88d hellodockertools:dev "C:\\remote_debugge" 10 minutes ago Up 10 minutes 0.0.0.0:37630->80/tcp dockercompose4642749010770307127_hellodockertools_1, REPOSITORY TAG IMAGE ID CREATED SIZE, hellodockertools latest e3984a64230c About a minute ago 258MB, hellodockertools dev d72ce0f1dfe7 4 minutes ago 255MB, microsoft/dotnet 2.1-sdk 9e243db15f91 6 days ago 1.7GB, microsoft/dotnet 2.1-aspnetcore-runtime fcc3887985bb 6 days ago 255MB, REPOSITORY TAG IMAGE ID CREATED SIZE, hellodockertools latest cd28f0d4abbd 12 seconds ago 349MB, hellodockertools dev 5fafe5d1ad5b 23 minutes ago 347MB, microsoft/aspnetcore-build 2.0 7fed40fbb647 13 days ago 2.02GB, microsoft/aspnetcore 2.0 c69d39472da9 13 days ago 347MB. The images on the machine are displayed: [!NOTE] An image is produced with the latest tag, which can be pushed to the private registry or Docker Hub. How to Migrate from a .NET Core 2.0 Web API to .NET Core 3.1 (Part 3), Using the IOptions Pattern in a .Net Core Application, How to Troubleshoot Azure Blob Trigger Functions. Refer to Dockerfile reference for an understanding of the commands within it. To do that execute the following command. I have questions like, "what changes will be made to my project files? We can see this by observing the running containers which shows or original container is still running. First open Docker Windows settings. Now when we run in VS2019, by default, our two microservices will run hosted by IIS Express. When adding Docker support to a project, choose either a Windows or a Linux container. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Would you like to join hundreds of others who receive my twice-monthly posts direct to their inbox? Assuming you have an existing .NET Core application. Once the sample project is created, you can visit DockerFile in the solution explorer of the created project. So in our case command is like, docker build -t dockerhubid/dockerdemowebapp . Multiple images can be built and moved into their own containers. Before we see how to run, let's just quickly look at the two other changes that happened when we enabled Docker support for the service. The answer is fortunately no to each of those questions. The answer is yes. Learn how to use Visual Studio tooling and Docker for Windows to containerize an ASP.NET Core app. First, Docker Compose will run the containers on the same Docker network, enabling them to communicate easily with each other. As you can see, this process is much more like a wizard as opposed to the monolithic dialog that was used in previous versions. Please Like and Subscribe on YouTube if you enjoyed this video. Docker is an amazing technology but, what is the development experience like? The Visual Studio Container Tools do the following tasks: Adds a Application Service Fabric Application project to the solution. There may be an expectation for the production or release image to be smaller in size by comparison to the dev image. View or download sample code (how to download). This is a new optimization added to Visual Studio 2019. Enjoy ;). In shared drives, select Reset Credentials, then reselect the C: drive. Create a new container instance resource like below. The other small change, is that our microservice .csproj file has been updated with a reference to the Docker Compose project: If we do the same for microservice2, and add container orchestration support, it simply will update our Docker Compose file with an additional entry: The other change that has happened, is that we've now gone back to having a single "startup project". For the purposes of this example we will select the API project template. This is a simple as installing Visual Studio 2019 with the .NET Core cross-platform development workload installed. Command: docker build -t dockerhubid/projectname: latest. [!TIP] This gives us the ability to set breakpoints and debug our application while it is running. Finally, it also helpfully creates a .dockerignore file for us which protects our Docker images from being bloated or unintentionally containing secrets. A common approach is to use a Docker Compose YAML file to set this up, and again Visual Studio can help us with this. We'll create a Visual Studio solution that has two web apps which will be our "microservices". In the solution context menu, select Add -> Docker Support. 4. I have mine set to Linux container mode and running on WSL2. The most common use for Docker is with microservices architectures, where a self-contained image of an entire system can be re-built, tested, and deployed across to a production clustered environment such as Kubernetes or Service Fabric at a low cost. If the project is already using a Linux container, Visual Studio prompts to switch to Windows containers. When the intermediary images are no longer needed, delete them using the docker rmi command. You can also see .dockerignore file in project solution explorer. To containerize an ASP.NET Core project, the project must target .NET Core. The docker compose (YML) file is used to create and build a container, then add the docker image to the container. It's added a UserSecretsId which is is a way to help us keep secrets out of source code in a development environment. It is great to Microsofts continued investment in this great new technology! It's also set the DockerDefaultTargetOS to Linux which was what we selected. To be able to use the Docker container tools within Visual Studio 2019 you will need an installation of Docker for Windows including its command line tools.
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