Forem: Avinash

Publish Docker Image In To Docker Hub

Avinash — Tue, 16 Jun 2020 11:19:26 +0000

Hello Everyone, in this article we will

Add Docker support to .net core web API application using visual studio.
How to debug your application, running the image through container.
Create the latest image of application for release.
Publish image in to Docker Hub.

Prerequisites:

Visual studio
Docker installed
.net core SDK
Docker Hub account

Hope you guys are ready with prerequisites before starting further steps. Lets get started.

Create .net core web API project using below command and open in visual studio.

dotnet new webapi -n WhetherForecastAPI

Verify the web app is created properly by running the application and navigating to the below route.Once done you will be able to see whether report as response.

https://localhost:{host number}/weatherforecast

OK, now we have our web app ready let us add docker support to our app.

Right-Click on the project WhetherForecastAPI then click on add select Docker Support.

As soon as you click on docker support visual studio will ask docker file option select based on your current docker container OS

Once you add docker support to your project visual studio is going to add two new file in solution i.e Dockerfile and .dockerignore.
Along with the package reference "Microsoft.VisualStudio.Azure.Containers.Tools.Targets"

Now that we have added docker support to application.

Developer will not create image directly in first go and publish it.
They will make changes in their code several times by debugging. Hence in next step we are going to see how we can debug our app.

It is as simple as we debug our regular application.Select Solution configuration as debug and Docker in place IIS Express as shown in the below image.

Once we run, visual studio will create the image of an application and runs that image in a local container.Application will run in your browser just put the break point and debug as normal application.

As of now our application will be running as image which is tagged ad
dev for example whetherforecastapi: dev

Once you are done with your changes, next step is to create a latest image of an application for release. In order to that select Release from Solution configuration as shown in below image.

As soon as you run the application latest image will be created and which is ready to publish.

Run below command to see the created image.

docker images

As mentioned in prerequisite you should have docker hub account. Login to that account and create repository in Docker Hub.

docker login

To tag your image to docker hub repository

docker tag whetherforecastapi {repository/name}

Publish your image to docker hub

docker push {repository/name}

Note: Replace {repository/name} with the newly created repository name.

Yes, We have successfully pushed the image in to docker hub and if we made our repository as public then anybody can access that by pulling that image.

Hope you guys enjoyed it.

Containerize a .NET Core Web API Project

Avinash — Thu, 11 Jun 2020 13:01:45 +0000

Hey, As the world is moving towards lighter things so the software's.

In this article you are going to learn, how we can create an image of an basic .net core web API application and run that in a container.

Prerequisites

Docker installed
.net core SDK

Verify that environment is ready by executing below commands in cmd.

dotnet --version 
  3.1.101

docker --version
  Docker version 19.03.8, build afacb8b

Before creating the image of an application. Let us create .net core web API application using below command.

dotnet new webapi -n TestWebAPI

Once the application is created, navigate to folder under which application is created

cd TestWebAPI

Before adding the .NET Core app to the Docker image, first it must
be published.

dotnet publish -c Release

We are ready with Application which needs to be created as a image.

Create a file named Dockerfile in directory containing the .csproj
and open it in a text editor copy below code into that file.
Dockerfile will be used by docker build command to create image


FROM mcr.microsoft.com/dotnet/core/aspnet:3.1

 COPY bin/Release/netcoreapp3.1/publish/ TestWebAPI/
 WORKDIR /TestWebAPI
 ENTRYPOINT ["dotnet", "TestWebAPI.dll"]

Create image of an application.Below command will use the commands
in Dockerfile to create image of an application.

docker build -t testimage -f Dockerfile .

To get the list of images.

docker images

Container is a instance of an image. Create container to run
created image in it.

docker create --name testcontainer testimage

To get the list of container.

docker ps -a

The status of the container will be created and not Up
until we start the container using below command.

Start container

docker start testcontainer

After starting the container we have to run the container in one of the port.

docker run -p 8080:80 testimage

Open in the browser

http://localhost:8080/weatherforecast