Introduction

Harbor Image Registry is a powerful and secure solution for managing container images. Whether you are a developer looking to share your application’s image with teammates or an organization seeking centralized image management, pushing your container images to Harbor ensures secure storage and easy distribution. In this blog post, we will guide you through the process of pushing an image to Harbor Image Registry.

Step 1: Preparing your Image

Before pushing your image to Harbor, make sure you have built a Docker image of your application. This involves creating a Dockerfile that specifies the necessary dependencies and configurations for your application. Build the Docker image using the following command:

docker build -t <image_name>:<tag> .

Replace <image_name> with the desired name for your image and <tag> with a version or tag to identify the image.

Step 2: Tagging the Image

To push the image to Harbor, you need to tag it appropriately. The tag should include the registry URL, project name, and the image name. Use the following command to tag your image:

docker tag <image_name>:<tag> <harbor_registry_url>/<project_name>/<image_name>:<tag>

Replace <harbor_registry_url> with the URL of your Harbor Image Registry instance, <project_name> with the name of the project or repository in Harbor, and <image_name> and <tag> with the same values used during the image build.

Step 3: Authenticating with Harbor

To push an image to Harbor, you need to authenticate yourself. Obtain the Harbor credentials (username and password) from your system administrator or Harbor administrator. Use the following command to log in to Harbor:

docker login <harbor_registry_url>

You will be prompted to enter your username and password. Once authenticated, Docker will store the login credentials for future interactions with the Harbor registry.

Step 4: Pushing the Image

With the image properly tagged and authenticated, you can now push it to Harbor. Use the following command:

docker push <harbor_registry_url>/<project_name>/<image_name>:<tag>

This command will upload your image to the specified project or repository in Harbor. Depending on the image size and your network connection, the process may take some time. Once completed, you will receive a success message indicating that the image has been pushed successfully.

Step 5: Verifying the Image in Harbor

To ensure the image has been successfully pushed to Harbor, you can verify its presence through the Harbor web interface or by using the Harbor API. Log in to your Harbor instance via the web interface and navigate to the appropriate project/repository. You should see the pushed image listed there.

Conclusion

Pushing your container image to Harbor Image Registry provides a secure and centralized solution for managing and distributing your container images. By following the steps outlined in this guide, you can easily push your images to Harbor and leverage its powerful features for image management. Whether you are working individually or as part of an organization, Harbor simplifies the container image lifecycle and ensures secure image distribution within your infrastructure.