Dockerize .NET web API

In this blog, we will explore how to containerize your .NET WebAPI applications using Docker, a popular containerization platform.

We migrated from Web API to .net core for the following reasons listed below,

Click create a new project in the home menu of visual studio,

Select “ASP.NET Core Web API” and click next,

Choose the project and solution name and click “Next”,

Next choose the default framework and click Create.

Next delete the weatherforecast.cs file in the “controller” folder and in the root where program.cs is located.

Create a New controller By “Right-clicking” on the “controller” folder and click “add” choose “controller” , then choose “API” and click “next”

Change the name to “TestController.cs” and click “Add”

Copy paste the below code into “TestController.cs”

                                
                                    
  using Microsoft.AspNetCore.Http;
  using Microsoft.AspNetCore.Mvc;
  namespace DockerWebAPI.Controllers
  {
      [Route("api/[controller]/[action]")]
      [ApiController]
      public class TestController : ControllerBase
      {
          [HttpGet]
          public string Hello()
          {
              return "Hello world";
          }
      }
  }
    
                                
                            

Now run the app and check if everything is working fine using postman as follows,

Also Create the build files by first “right-click” on the project folder then click publish then choose “folder” as target destination and click “close” now click “publish” again.The Build files will be generated. Within it we have the .dll file which we are going to use to run our app within our docker container.

Now create a file called “Dockerfile” in the root of the project and copy paste the below code,

                                
                                    
    FROM mcr.microsoft.com/dotnet/aspnet:6.0
    COPY bin/Release/net6.0/publish .
    ENTRYPOINT ["dotnet", "DockerWebAPI.dll"]
    
                                
                            

In the above “Dockerfile” we are using the “aspnet” image from dockerhub as our base image and copy the build files and running the command “dotnet DockerWebAPI.dll” inside the container which will run our app.

Now we can generate our docker image by running the following command in the root of our project where the “Dockerfile” is located,

                                
                                    
    docker build -t docker-webapi 
    
                                
                            

Then we can create a container from our docker image as follows,

                                
                                    
    docker run -p 8080:80 docker-webapi
    
                                
                            

Now we can test it using postman as follows,

We have successfully containerized and tested the dotnet webAPI  Thus by leveraging Docker's containerization technology, you can optimize your web API deployment process and achieve a more efficient and reliable application delivery workflow.

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