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Relocate an Azure Container Registry to another region

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This article shows you how to relocate Azure Container Registry resources to another region in the same subscription of the Active Directory tenant.

Note

If you need to distribute identical container images across multiple Azure regions, Azure Container Registry also supports geo-replication. By geo-replicating a registry (Premium service tier required), you can serve multiple regions with identical image and tag names from a single registry.

Prerequisites

Considerations for Service Endpoints

The virtual network service endpoints for Azure Container Registry restrict access to a specified virtual network. The endpoints can also restrict access to a list of IPv4 (internet protocol version 4) address ranges. Any user connecting to the registry from outside those sources is denied access. If Service endpoints were configured in the source region for the registry resource, the same would need to be done in the target one. The steps for this scenario are mentioned below:

  • For a successful recreation of the registry to the target region, the VNet and Subnet must be created beforehand. If the move of these two resources is being carried out with the Azure Resource Mover tool, the service endpoints won’t be configured automatically and so you'll need to provide manual configuration.

  • Secondly, changes need to be made in the IaC of the Azure Container Registry. In networkAcl section, under virtualNetworkRules, add the rule for the target subnet. Ensure that the ignoreMissingVnetServiceEndpoint flag is set to False, so that the IaC fails to deploy the Azure Container Registry in case the service endpoint isn’t configured in the target region. This will ensure that the prerequisites in the target region are met

Consideration for private endpoint

Azure Private Link provides private connectivity from a virtual network to Azure platform as a service (PaaS), customer-owned, or Microsoft partner services. Private Link simplifies the network architecture and secures the connection between endpoints in Azure by eliminating data exposure to the public internet.

For a successful recreation of your resource in the target region, the VNet and Subnet must be created before the actual recreation occurs.

Considerations for Azure Private Endpoint DNS integration

It’s important to correctly configure your DNS settings to resolve the private endpoint IP address to the fully qualified domain name (FQDN) of the connection string.

Existing Microsoft Azure services might already have a DNS configuration for a public endpoint. This configuration must be overridden to connect using your private endpoint.

The network interface associated with the private endpoint contains the information to configure your DNS. The network interface information includes FQDN and private IP addresses for your private link resource.

You can use the following options to configure your DNS settings for private endpoints:

  • Use the host file (only recommended for testing). You can use the host file on a virtual machine to override the DNS.
  • Use a private DNS zone. You can use private DNS zones to override the DNS resolution for a private endpoint. A private DNS zone can be linked to your virtual network to resolve specific domains.
  • Use your DNS forwarder (optional). You can use your DNS forwarder to override the DNS resolution for a private link resource. Create a DNS forwarding rule to use a private DNS zone on your DNS server hosted in a virtual network.

  • Azure Container Registry must be configured in the target region with premium tier.

  • When public network access to a registry is disabled, registry access by certain trusted services - including Azure Security Center - requires enabling a network setting to bypass the network rules.

  • If the registry has an approved private endpoint and public network access is disabled, repositories and tags can’t be listed outside the virtual network using the Azure portal, Azure CLI, or other tools.

  • In case the case of a new replica, its imperative to manually add a new DNS record for the data endpoint in the target region.

Downtime

To understand the possible downtimes involved, see Cloud Adoption Framework for Azure: Select a relocation method.

Prepare

Note

If you only want to relocate a Container Registry that doesn't hold any client specific data and is to be moved alone, you can simply redeploy the registry by using Bicep or JSON.

To view other availability configuration templates, go to Define resources with Bicep, ARM templates, and Terraform AzAPI provider

To prepare for relocation with data migration:

  1. Create a dependency map with all the Azure services used by the registry. For the services that are in scope of the relocation, you must choose the appropriate relocation strategy.

  2. Identify the source networking layout for Azure Container Registry (ACR) like firewall and network isolation.

  3. Retrieve any required images from the source registry for import into the target registry. To retrieve the images, run the following command:

    
Get-AzContainerRegistryRepository -RegistryName registry

  4. Use ACR Tasks to retrieve automation configurations of the source registry for import into the target registry.

Export template

To get started, export a Resource Manager template. This template contains settings that describe your Container Registry. For more information on how to use exported templates, see Use exported template from the Azure portal and the template reference.

  1. In the Azure portal, navigate to your source registry.

  2. In the menu, under Automation, select Export template > Download.

    Screenshot of export template for container registry.

  3. Locate the .zip file that you downloaded from the portal, and unzip that file to a folder of your choice.

    This zip file contains the .json files that include the template and scripts to deploy the template.

Modify template

Inspect the registry properties in the template JSON file you downloaded, and make necessary changes. At a minimum:

  • Change the registry name's defaultValue to the desired name of the target registry
  • Update the location to the desired Azure region for the target registry
{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "registries_myregistry_name": {
            "defaultValue": "myregistry",
            "type": "String"
        }
    },
    "variables": {},
    "resources": [
        {
            "type": "Microsoft.ContainerRegistry/registries",
            "apiVersion": "2020-11-01-preview",
            "name": "[parameters('myregistry_name')]",
            "location": "centralus",
        ...
        }
    ]
}

  • Validate all the associated resources detail in the downloaded template such as Registry scopeMaps, replications configuration, Diagnostic settings like log analytics.

  • If the source registry is encrypted, then encrypt the target registry using a customer-managed key and update the template with settings for the required managed identity, key vault, and key. You can only enable the customer-managed key when you deploy the registry.

Create resource group

Create a resource group for the target registry using the az group create. The following example creates a resource group named myResourceGroup in the eastus location.

az group create --name myResourceGroup --location eastus

Redeploy

Use the az deployment group create command to deploy the target registry, using the template:

az deployment group create --resource-group myResourceGroup \
   --template-file template.json --name mydeployment

Note

If you see errors during deployment, you might need to update certain configurations in the template file and retry the command.

Import registry content in target registry

After creating the registry in the target region:

  1. Use the az acr import command, or the equivalent PowerShell command Import-AzContainerImage, to import images and other artifacts you want to preserve from the source registry to the target registry. For command examples, see Import container images to a container registry.

  2. Use the Azure CLI commands az acr repository list and az acr repository show-tags, or Azure PowerShell equivalents, to help enumerate the contents of your source registry.

  3. Run the import command for individual artifacts, or script it to run over a list of artifacts.

The following sample Azure CLI script enumerates the source repositories and tags and then imports the artifacts to a target registry in the same Azure subscription. Modify as needed to import specific repositories or tags. To import from a registry in a different subscription or tenant, see examples in Import container images to a container registry.

#!/bin/bash
# Modify registry names for your environment
SOURCE_REG=myregistry
TARGET_REG=targetregistry

# Get list of source repositories
REPO_LIST=$(az acr repository list \
    --name $SOURCE_REG --output tsv)

# Enumerate tags and import to target registry
for repo in $REPO_LIST; do
    TAGS_LIST=$(az acr repository show-tags --name $SOURCE_REG --repository $repo --output tsv);
    for tag in $TAGS_LIST; do
        echo "Importing $repo:$tag";
        az acr import --name $TARGET_REG --source $SOURCE_REG.azurecr.io/$repo":"$tag;
    done
done

  1. Associate the dependent resources to the target Azure Container Registry such as log analytics workspace in Diagnostic settings.

  2. Configure Azure Container Registry integration with both type of AKS clusters, provisioned or yet to be provisioned by running the following command:


Set-AzAksCluster -Name myAKSCluster -ResourceGroupName myResourceGroup -AcrNameToAttach <acr-name>

  1. Make the necessary changes to the Kubernetes manifest file to integrate same with relocated Azure Container Registry (ACR).

  2. Update development and deployment systems to use the target registry instead of the source registry.

  3. Update any client firewall rules to allow access to the target registry.

Verify

Confirm the following information in your target registry:

  • Registry settings such as the registry name, service tier, public access, and replications
  • Repositories and tags for content that you want to preserve.

Delete original registry

After you have successfully deployed the target registry, migrated content, and verified registry settings, you may delete the source registry.

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