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Authenticate with Azure Container Registry (ACR) from Azure Kubernetes Service (AKS)

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When using Azure Container Registry (ACR) with Azure Kubernetes Service (AKS), you need to establish an authentication mechanism. You can configure the required permissions between ACR and AKS using the Azure CLI, Azure PowerShell, or Azure portal. This article provides examples to configure authentication between these Azure services using the Azure CLI or Azure PowerShell.

The AKS to ACR integration assigns the AcrPull role to the Microsoft Entra ID managed identity associated with the agent pool in your AKS cluster. For more information on AKS managed identities, see Summary of managed identities.

Important

There's a latency issue with Microsoft Entra groups when attaching ACR. If the AcrPull role is granted to a Microsoft Entra group and the kubelet identity is added to the group to complete the RBAC configuration, there may be a delay before the RBAC group takes effect. If you're running automation that requires the RBAC configuration to be complete, we recommend you use Bring your own kubelet identity as a workaround. You can pre-create a user-assigned identity, add it to the Microsoft Entra group, then use the identity as the kubelet identity to create an AKS cluster. This ensures the identity is added to the Microsoft Entra group before a token is generated by kubelet, which avoids the latency issue.

Note

This article covers automatic authentication between AKS and ACR. If you need to pull an image from a private external registry, use an image pull secret.

Before you begin

Create a new ACR

  • If you don't already have an ACR, create one using the az acr create command. The following example sets the MYACR variable to the name of the ACR, mycontainerregistry, and uses the variable to create the registry. Your ACR name must be globally unique and use only lowercase letters.

    MYACR=mycontainerregistry

az acr create --name $MYACR --resource-group myContainerRegistryResourceGroup --sku basic

Create a new AKS cluster and integrate with an existing ACR

  • Create a new AKS cluster and integrate with an existing ACR using the az aks create command with the --attach-acr parameter. This command allows you to authorize an existing ACR in your subscription and configures the appropriate AcrPull role for the managed identity.

    MYACR=mycontainerregistry

az aks create --name myAKSCluster --resource-group myResourceGroup --generate-ssh-keys --attach-acr $MYACR

    This command may take several minutes to complete.

    Note

    If you're using an ACR located in a different subscription from your AKS cluster or would prefer to use the ACR resource ID instead of the ACR name, you can do so using the following syntax:

    az aks create -n myAKSCluster -g myResourceGroup --generate-ssh-keys --attach-acr /subscriptions/<subscription-id>/resourceGroups/myContainerRegistryResourceGroup/providers/Microsoft.ContainerRegistry/registries/myContainerRegistry

Configure ACR integration for an existing AKS cluster

Attach an ACR to an existing AKS cluster

  • Integrate an existing ACR with an existing AKS cluster using the az aks update command with the --attach-acr parameter and a valid value for acr-name or acr-resource-id.

    # Attach using acr-name
az aks update --name myAKSCluster --resource-group myResourceGroup --attach-acr <acr-name>

# Attach using acr-resource-id
az aks update --name myAKSCluster --resource-group myResourceGroup --attach-acr <acr-resource-id>

    Note

    The az aks update --attach-acr command uses the permissions of the user running the command to create the ACR role assignment. This role is assigned to the kubelet managed identity. For more information on AKS managed identities, see Summary of managed identities.

Detach an ACR from an AKS cluster

  • Remove the integration between an ACR and an AKS cluster using the az aks update command with the --detach-acr parameter and a valid value for acr-name or acr-resource-id.

    # Detach using acr-name
az aks update --name myAKSCluster --resource-group myResourceGroup --detach-acr <acr-name>

# Detach using acr-resource-id
az aks update --name myAKSCluster --resource-group myResourceGroup --detach-acr <acr-resource-id>

Working with ACR & AKS

Import an image into your ACR

  • Import an image from Docker Hub into your ACR using the az acr import command.

    az acr import --name <acr-name> --source docker.io/library/nginx:latest --image nginx:v1

Deploy the sample image from ACR to AKS

  1. Ensure you have the proper AKS credentials using the az aks get-credentials command.

    az aks get-credentials --resource-group myResourceGroup --name myAKSCluster

  2. Create a file called acr-nginx.yaml using the following sample YAML and replace acr-name with the name of your ACR.

    apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx0-deployment
  labels:
    app: nginx0-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx0
  template:
    metadata:
      labels:
        app: nginx0
    spec:
      containers:
      - name: nginx
        image: <acr-name>.azurecr.io/nginx:v1
        ports:
        - containerPort: 80

  3. Run the deployment in your AKS cluster using the kubectl apply command.

    kubectl apply -f acr-nginx.yaml

  4. Monitor the deployment using the kubectl get pods command.

    kubectl get pods

    The output should show two running pods, as shown in the following example output:

    NAME                                 READY   STATUS    RESTARTS   AGE
nginx0-deployment-669dfc4d4b-x74kr   1/1     Running   0          20s
nginx0-deployment-669dfc4d4b-xdpd6   1/1     Running   0          20s

Troubleshooting