Configure remote repository authentication to Docker Hub

This document describes how to configure authentication to Docker Hub upstream repositories for Artifact Registry remote repositories.

We recommend authenticating to Docker Hub even if you are only using public images, as authenticating will increase your download rate limit. For more information on Docker Hub download rate limits, see Docker Hub rate limit. Remote repositories allow you to add your Docker Hub username and a personal access token saved as a secret to authenticate to Docker Hub.

This document assumes you have already created an Artifact Registry Docker remote repository, and a Docker Hub account.

For more information on remote repositories, see the Remote repositories overview.

Required roles

To get the permissions that you need to configure authentication to Docker Hub for remote repositories, ask your administrator to grant you the following IAM roles on the project:

For more information about granting roles, see Manage access to projects, folders, and organizations.

You might also be able to get the required permissions through custom roles or other predefined roles.

Create a Docker Hub personal access token

  1. Sign in to Docker Hub.
  2. Create a personal access token with read-only permissions.

  3. Copy the access token.

  4. Save the access token in a text file in your local or Cloud Shell.

Save your personal access token in a secret version

  1. Create a secret in Secret Manager.
  2. Save your Docker Hub personal access token as a secret version.

Grant the Artifact Registry service account access to your secret

The Artifact Registry service agent acts on behalf of Artifact Registry when interacting with Google Cloud services. To allow the service agent to use secrets stored in Secret Manager, you must grant the service agent permission to view your secret version.

The service agent identifier is:

service-PROJECT-NUMBER@gcp-sa-artifactregistry.iam.gserviceaccount.com

PROJECT-NUMBER is the project number of the Google Cloud project where Artifact Registry is running.

To grant the Artifact Registry service agent the Secret Manager Secret Accessor role:

Console

  1. Go to the Secret Manager page in the Google Cloud console.

    Go to the Secret Manager page

  2. On the Secret Manager page, click the checkbox next to the name of the secret.

  3. If it is not already open, click Show Info Panel to open the panel.

  4. In the info panel, click Add Principal.

  5. In the New principals text area, enter the email address(es) of the members to add.

  6. In the Select a role dropdown, choose Secret Manager and then Secret Manager Secret Accessor.

gcloud

$ gcloud secrets add-iam-policy-binding secret-id \
    --member="member" \
    --role="roles/secretmanager.secretAccessor"

Where member is an IAM member, such as a user, group, or service account.

C#

To authenticate to Artifact Registry, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 


using Google.Cloud.SecretManager.V1;
using Google.Cloud.Iam.V1;

public class IamGrantAccessSample
{
    public Policy IamGrantAccess(
      string projectId = "my-project", string secretId = "my-secret",
      string member = "user:foo@example.com")
    {
        // Create the client.
        SecretManagerServiceClient client = SecretManagerServiceClient.Create();

        // Build the resource name.
        SecretName secretName = new SecretName(projectId, secretId);

        // Get current policy.
        Policy policy = client.GetIamPolicy(new GetIamPolicyRequest
        {
            ResourceAsResourceName = secretName,
        });

        // Add the user to the list of bindings.
        policy.AddRoleMember("roles/secretmanager.secretAccessor", member);

        // Save the updated policy.
        policy = client.SetIamPolicy(new SetIamPolicyRequest
        {
            ResourceAsResourceName = secretName,
            Policy = policy,
        });
        return policy;
    }
}

Go

To authenticate to Artifact Registry, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

import (
	"context"
	"fmt"
	"io"

	secretmanager "cloud.google.com/go/secretmanager/apiv1"
)

// iamGrantAccess grants the given member access to the secret.
func iamGrantAccess(w io.Writer, name, member string) error {
	// name := "projects/my-project/secrets/my-secret"
	// member := "user:foo@example.com"

	// Create the client.
	ctx := context.Background()
	client, err := secretmanager.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("failed to create secretmanager client: %w", err)
	}
	defer client.Close()

	// Get the current IAM policy.
	handle := client.IAM(name)
	policy, err := handle.Policy(ctx)
	if err != nil {
		return fmt.Errorf("failed to get policy: %w", err)
	}

	// Grant the member access permissions.
	policy.Add(member, "roles/secretmanager.secretAccessor")
	if err = handle.SetPolicy(ctx, policy); err != nil {
		return fmt.Errorf("failed to save policy: %w", err)
	}

	fmt.Fprintf(w, "Updated IAM policy for %s\n", name)
	return nil
}

Java

To authenticate to Artifact Registry, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

import com.google.cloud.secretmanager.v1.SecretManagerServiceClient;
import com.google.cloud.secretmanager.v1.SecretName;
import com.google.iam.v1.Binding;
import com.google.iam.v1.GetIamPolicyRequest;
import com.google.iam.v1.Policy;
import com.google.iam.v1.SetIamPolicyRequest;
import java.io.IOException;

public class IamGrantAccess {

  public static void iamGrantAccess() throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String secretId = "your-secret-id";
    String member = "user:foo@example.com";
    iamGrantAccess(projectId, secretId, member);
  }

  // Grant a member access to a particular secret.
  public static void iamGrantAccess(String projectId, String secretId, String member)
      throws IOException {
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the "close" method on the client to safely clean up any remaining background resources.
    try (SecretManagerServiceClient client = SecretManagerServiceClient.create()) {
      // Build the name from the version.
      SecretName secretName = SecretName.of(projectId, secretId);

      // Request the current IAM policy.
      Policy currentPolicy =
          client.getIamPolicy(
              GetIamPolicyRequest.newBuilder().setResource(secretName.toString()).build());

      // Build the new binding.
      Binding binding =
          Binding.newBuilder()
              .setRole("roles/secretmanager.secretAccessor")
              .addMembers(member)
              .build();

      // Create a new IAM policy from the current policy, adding the binding.
      Policy newPolicy = Policy.newBuilder().mergeFrom(currentPolicy).addBindings(binding).build();

      // Save the updated IAM policy.
      client.setIamPolicy(
          SetIamPolicyRequest.newBuilder()
              .setResource(secretName.toString())
              .setPolicy(newPolicy)
              .build());

      System.out.printf("Updated IAM policy for %s\n", secretId);
    }
  }
}

Node.js

To authenticate to Artifact Registry, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const name = 'projects/my-project/secrets/my-secret';
// const member = 'user:you@example.com';
//
// NOTE: Each member must be prefixed with its type. See the IAM documentation
// for more information: https://cloud.google.com/iam/docs/overview.

// Imports the Secret Manager library
const {SecretManagerServiceClient} = require('@google-cloud/secret-manager');

// Instantiates a client
const client = new SecretManagerServiceClient();

async function grantAccess() {
  // Get the current IAM policy.
  const [policy] = await client.getIamPolicy({
    resource: name,
  });

  // Add the user with accessor permissions to the bindings list.
  policy.bindings.push({
    role: 'roles/secretmanager.secretAccessor',
    members: [member],
  });

  // Save the updated IAM policy.
  await client.setIamPolicy({
    resource: name,
    policy: policy,
  });

  console.log(`Updated IAM policy for ${name}`);
}

grantAccess();

PHP

To authenticate to Artifact Registry, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

// Import the Secret Manager client library.
use Google\Cloud\SecretManager\V1\Client\SecretManagerServiceClient;

// Import the Secret Manager IAM library.
use Google\Cloud\Iam\V1\Binding;
use Google\Cloud\Iam\V1\GetIamPolicyRequest;
use Google\Cloud\Iam\V1\SetIamPolicyRequest;

/**
 * @param string $projectId Your Google Cloud Project ID (e.g. 'my-project')
 * @param string $secretId  Your secret ID (e.g. 'my-secret')
 * @param string $member Your member (e.g. 'user:foo@example.com')
 */
function iam_grant_access(string $projectId, string $secretId, string $member): void
{
    // Create the Secret Manager client.
    $client = new SecretManagerServiceClient();

    // Build the resource name of the secret.
    $name = $client->secretName($projectId, $secretId);

    // Get the current IAM policy.
    $policy = $client->getIamPolicy((new GetIamPolicyRequest)->setResource($name));

    // Update the bindings to include the new member.
    $bindings = $policy->getBindings();
    $bindings[] = new Binding([
        'members' => [$member],
        'role' => 'roles/secretmanager.secretAccessor',
    ]);
    $policy->setBindings($bindings);

    // Build the request.
    $request = (new SetIamPolicyRequest)
        ->setResource($name)
        ->setPolicy($policy);

    // Save the updated policy to the server.
    $client->setIamPolicy($request);

    // Print out a success message.
    printf('Updated IAM policy for %s', $secretId);
}

Python

To authenticate to Artifact Registry, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

def iam_grant_access(
    project_id: str, secret_id: str, member: str
) -> iam_policy_pb2.SetIamPolicyRequest:
    """
    Grant the given member access to a secret.
    """

    # Import the Secret Manager client library.
    from google.cloud import secretmanager

    # Create the Secret Manager client.
    client = secretmanager.SecretManagerServiceClient()

    # Build the resource name of the secret.
    name = client.secret_path(project_id, secret_id)

    # Get the current IAM policy.
    policy = client.get_iam_policy(request={"resource": name})

    # Add the given member with access permissions.
    policy.bindings.add(role="roles/secretmanager.secretAccessor", members=[member])

    # Update the IAM Policy.
    new_policy = client.set_iam_policy(request={"resource": name, "policy": policy})

    # Print data about the secret.
    print(f"Updated IAM policy on {secret_id}")

Ruby

To authenticate to Artifact Registry, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

# project_id = "YOUR-GOOGLE-CLOUD-PROJECT"  # (e.g. "my-project")
# secret_id  = "YOUR-SECRET-ID"             # (e.g. "my-secret")
# member     = "USER-OR-ACCOUNT"            # (e.g. "user:foo@example.com")

# Require the Secret Manager client library.
require "google/cloud/secret_manager"

# Create a Secret Manager client.
client = Google::Cloud::SecretManager.secret_manager_service

# Build the resource name of the secret.
name = client.secret_path project: project_id, secret: secret_id

# Get the current IAM policy.
policy = client.get_iam_policy resource: name

# Add new member to current bindings
policy.bindings << Google::Iam::V1::Binding.new(
  members: [member],
  role:    "roles/secretmanager.secretAccessor"
)

# Update IAM policy
new_policy = client.set_iam_policy resource: name, policy: policy

# Print a success message.
puts "Updated IAM policy for #{secret_id}"

API

Note: Unlike the other examples, this replaces the entire IAM policy.

$ curl "https://secretmanager.googleapis.com/v1/projects/project-id/secrets/secret-id:setIamPolicy" \
    --request "POST" \
    --header "authorization: Bearer $(gcloud auth print-access-token)" \
    --header "content-type: application/json" \
    --data "{\"policy\": {\"bindings\": [{\"members\": [\"member\"], \"role\": \"roles/secretmanager.secretAccessor\"}]}}"

For more information on granting or revoking access to secrets, see Manage access to secrets.

Add Docker Hub credentials to your remote repository

To update your remote repository with your Docker Hub credentials:

Console

  1. Open the Repositories page in the Google Cloud console.

    Open the Repositories page

  2. In the repository list, select the repository and click Edit Repository.

  3. In the Remote repository authentication mode section, update or add your Docker Hub username and the secret version containing your Docker Hub access token.

gcloud CLI

To update your remote repository with your Docker Hub credentials, run the following command:

gcloud artifacts repositories update REPOSITORY \
    --project=PROJECT_ID \
    --location=LOCATION \
    --remote-username=USERNAME \
    --remote-password-secret-version=projects/SECRET_PROJECT_ID/secrets/SECRET_ID/versions/SECRET_VERSION

Replace the following:

  • REPOSITORY with the name of your Artifact Registry remote repository.
  • PROJECT_ID with your Google Cloud project ID.
  • LOCATION with the regional or multi-regional location for the repository. You can omit this flag if you set a default. To view a list of supported locations, run the command gcloud artifacts locations list.
  • USERNAME with your Docker Hub username.
  • SECRET_PROJECT_ID with the project ID of the Google Cloud project in which you created your secret.
  • SECRET_ID with the name you gave your secret.
  • SECRET_VERSION with the secret version you saved your Docker Hub access token in.

Your credentials are used the next time the remote repository sends a request for an artifact from the upstream source.

What's next