Kubernetes: Pull an Image from a Private Registry using Yaml and Helm File

Method 1 – Change docker config default registry

To change the default registry for Docker to a private registry that requires authentication, you can follow these steps:

1. Create or edit the /etc/docker/daemon.json file on your Docker host machine.
2. Add the following lines to the file, replacing your-registry with the URL of your private registry and your-username and your-password with your registry credentials:

{
  "auths": {
    "your-registry": {
      "auth": "your-username:your-password"
    }
  },
  "registry-mirrors": ["https://your-registry"]
}

Note that the auths key is used to specify the credentials for your private registry, and the registry-mirrors key is used to specify the URL of the registry.

3. Save the file and exit.
4. Restart the Docker daemon to apply the changes:

$ sudo systemctl restart docker

5. Verify that the configuration has been applied by running the docker info command. You should see the URL of your registry listed under “Registry Mirrors”.

$ docker info
...
Registry Mirrors:
  https://your-registry/
...

With this configuration, Docker will use your private registry as the default registry for pulling images and will authenticate with your registry credentials.

Method 2 – Create a Secret based on existing credentials using in Pod Spec

• https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
• https://docs.gitlab.com/runner/install/kubernetes.html#using-an-image-from-a-private-registry

Method 3 – Create a Secret based on existing credentials using Helm chart

• https://stackoverflow.com/questions/49669077/helm-chart-deployment-and-private-docker-repository

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