Docker is a platform that allows developers to build, ship, and run applications in containers. It provides a flexible and efficient way to deploy applications by packaging them with all their dependencies into a single container that can run anywhere. .NET Core is an open-source, cross-platform, and high-performance framework for building modern, cloud-based applications. In this article, we will discuss how to deploy .NET Core applications with Docker.
Before we begin, make sure you have the following tools installed on your system:
- Docker - Install from https://docs.docker.com/desktop/install/windows-install/
- .NET Core SDK
- Visual Studio Code (optional)
Step 1: Create a .NET Core Application
The first step is to create a .NET Core application that we will deploy using Docker. Open Visual Studio Code and create a new folder for your project. Open a terminal window in the project folder and run the following command to create a new .NET Core console application:
dotnet new console
This will create a new console application in the current folder.
Step 2: Dockerfile
The next step is to create a Dockerfile that will define the configuration of our Docker container. Create a new file in the root of your project folder and name it Dockerfile. Add the following lines to the file:
FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env WORKDIR /app COPY *.csproj ./ RUN dotnet restore COPY . ./ RUN dotnet publish -c Release -o out FROM mcr.microsoft.com/dotnet/core/runtime:3.1 WORKDIR /app COPY --from=build-env /app/out . ENTRYPOINT [ "dotnet", "myapp.dll" ]
This Dockerfile uses two base images provided by Microsoft - one for building the application and another for running it. The first part of the file sets up the build environment, restores dependencies, and publishes the application. The second part sets up the runtime environment, copies the published files from the build container, and sets the entry point for the application.
Step 3: Build and Run the Docker Container
Now that we have created the Dockerfile, we can build the Docker container and run our application. Open a terminal window in the project folder and run the following command to build the Docker container:
docker build -t myapp .
This will build the Docker container and tag it with the name "myapp".
To run the container, run the following command:
docker run myapp
This will start the Docker container and run the .NET Core application inside it.
Docker provides a powerful and flexible way to deploy .NET Core applications. By packaging our application and its dependencies into a single container, we can ensure that it will run consistently across different environments. In this article, we have discussed how to create a Dockerfile, build a Docker container, and run a .NET Core application inside it. With these techniques, you can easily deploy your .NET Core applications to production environments and take advantage of the many benefits that Docker provides.
Check the article How to Create an ASP.NET Core Web Application