Attach ACR in a Different Subscription to an Existing AKS

In this post, let's see how we can attach an Azure Container Registry (ACR) to an existing Azure Kubernetes Cluster (AKS), but here the ACR is in a different subscription.

Using Azure CLI, the command to attach an ACR to an existing AKS is,

# Attach using acr-name
az aks update -n <aks-name> -g <resource-group-name> --attach-acr <acr-name>
 
# Attach using acr-resource-id
az aks update -n <aks-name> -g <resource-group-name> --attach-acr <acr-resource-id>

Since the ACR is in a different subscription, we can't attach using acr-name. Instead, we need to attach using the acr-resource-id.

While you can get the ResourceId from the URL after navigating to your ACR from the Azure Portal, the best approach is to get it from Azure CLI.

# Switch to subscription where ACR resides in
az account set --subscription <SubscriptionId>
 
# List resource information of the ACR
az resource list --name <acr-name>

And this will list something like below.

az resource list --name <acr-name>

And now you can run the attach command with Resource Id.

# Attach using acr-resource-id
az aks update -n <aks-name> -g <resource-group-name> --attach-acr <acr-resource-id>

Hope this helps.

Happy Coding.

Regards,

Jaliya