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Скачать или смотреть How to Pull an Image from a Private Registry using Kubernetes Service DNS Name

  • vlogize
  • 2025-08-17
  • 0
How to Pull an Image from a Private Registry using Kubernetes Service DNS Name
k8s pull image from private registry using service DNS namedockerkubernetesdocker registry
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Описание к видео How to Pull an Image from a Private Registry using Kubernetes Service DNS Name

Learn how to successfully pull Docker images from a private registry in Kubernetes when using service DNS names, even in challenging environments like Docker for Windows and WSL2.
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This video is based on the question https://stackoverflow.com/q/64889838/ asked by the user 'stefan' ( https://stackoverflow.com/u/985296/ ) and on the answer https://stackoverflow.com/a/64893995/ provided by the user 'stefan' ( https://stackoverflow.com/u/985296/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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How to Pull an Image from a Private Registry using Kubernetes Service DNS Name

Deploying and managing applications in a Kubernetes environment can sometimes lead to unexpected issues, particularly when configuring private image registries. If you're running Docker for Windows with WSL2, you might find yourself puzzled when trying to pull images from a private registry using its service DNS name. In this post, we will explore the problem and provide a comprehensive solution.

The Problem

You have set up a private Docker image registry using a registry:2 pod within your Kubernetes cluster. To access this registry, you've created two services:

registry-external: For outside access, using NodePort on port 32020.

registry: For internal access, using a Service on port 2100.

You can successfully login to the registry from outside the cluster using docker login localhost:32020. However, when trying to pull an image from within the cluster using registry.default.svc.cluster.local:2100/animage:latest, you encounter the error:

[[See Video to Reveal this Text or Code Snippet]]

This leads to confusion over whether the DNS address is valid during the image pull.

Understanding the Issue

The core of the issue lies in the fact that the image pull operation runs in an environment where the Kubernetes cluster's DNS is not available. Specifically, when using Docker for Windows, image pulls may occur on a network associated with the host and not directly inside a Kubernetes pod, where DNS resolution works as expected.

The Solution

To resolve this issue and successfully pull images from your private registry, follow these steps:

Step 1: Update the Image Pull Secret

You will need to adjust your image pull secret to use localhost instead of the service DNS name. Here’s how to do it:

Modify your image pull secret to specify localhost:32020 as the registry address:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Update the Image Name

Once the image pull secret is adjusted, you will also need to change how you refer to the image in your Kubernetes configurations. Instead of using the DNS name for the service, replace it with:

[[See Video to Reveal this Text or Code Snippet]]

Summary of Changes

Old Pull Secret:

[[See Video to Reveal this Text or Code Snippet]]

New Pull Secret:

[[See Video to Reveal this Text or Code Snippet]]

Old Image Reference:

[[See Video to Reveal this Text or Code Snippet]]

New Image Reference:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By adjusting your image pull secret and image reference to use localhost, you can successfully pull Docker images from your private registry in a Kubernetes environment, even when faced with DNS resolution issues. This practical solution will help streamline your workflow and eliminate confusion when deploying applications that require access to private registries.

If you have any additional questions or need further clarification on this topic, feel free to leave a comment below!

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