Continuous deployment
.NET Core ASP.NET Core CICD Containers DevOps Docker

How to Publish a .NET Core Application into a Docker Hub Container Registry

Welcome to today’s post.

I will discuss how to publish a docker image from a .Net Core Application to a DockerHub container registry.

To prepare your .Net Core application for Docker support see my previous post where I show you how this is done. It is quite straightforward.

Next, select the Publish option from the web project context menu. The following publish wizard screen will show:

Select New Profile …

The following Publish Target screen opens:

Select Container Registry and Docker Hub.

Click on Publish. Select Create profile in the drop-down options.

In the authentication screen that opens, enter your docker user account name and password.

Click on Save.

The Publish screen will display:

The URL to your repository in docker will be of the format:[account-name]/[repository-name]

Click on Publish.

The output window will show the image build and deployment progress.

The following step in the build:

Step 4/16 : FROM microsoft/aspnetcore-build:2.0 AS build
2.0: Pulling from microsoft/aspnetcore-build

Will could take a while (time depending on your internet download speed).

Be patient!

Once all the publication steps have completed, you will see output like that shown below:

Once the build phase completes, the docker image will also be re-built within the docker images on your machine:

the docker image deployment to docker hub commences in a separate command line process. This is the push process:

Once building and publishing is completed, open the docker hub

(and login if required). Go to repositories. The new docker image will show in the list of repositories as shown:

Click on the repository view icon as shown:

The repository details will show:

The repository does not have a tag. You can add a new tag by pushing a new one with the following command:

docker push [dockeraccount]/[repositoryname]:tagname

Select the Tags tabbed menu. You will see the Digest, OS and Size details:

Select the Builds tabbed menu. You will see the screen:

Here you will see two options, link your repository image to a GitHub or Bitbucket build.

This will allow you to automate the build of your Docker source container image from a GitHub repository.

In a separate post I will show how to trigger builds of your Docker image from your Git repository.

That’s all for now.

I hope this post has been useful and informative.

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