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Create a pool with disk encryption enabled

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When you create an Azure Batch pool using Virtual Machine Configuration, you can encrypt compute nodes in the pool with a platform-managed key by specifying the disk encryption configuration.

This article explains how to create a Batch pool with disk encryption enabled.

Why use a pool with disk encryption configuration?

With a Batch pool, you can access and store data on the OS and temporary disks of the compute node. Encrypting the server-side disk with a platform-managed key will safeguard this data with low overhead and convenience.

Batch will apply one of these disk encryption technologies on compute nodes, based on pool configuration and regional supportability.

You won't be able to specify which encryption method will be applied to the nodes in your pool. Instead, you provide the target disks you want to encrypt on their nodes, and Batch can choose the appropriate encryption method, ensuring the specified disks are encrypted on the compute node. The following image depicts how Batch makes that choice.

Importanti

If you are creating your pool with a Linux custom image, you can only enable disk encryption only if your pool is using an Encryption At Host Supported VM size. Encryption At Host is not currently supported on User Subscription Pools until the feature becomes publicly available in Azure.

Screenshot of the Pool Creation in the Azure portal.

Some disk encryption configurations require that the VM family of the pool supports encryption at host. See End-to-end encryption using encryption at host to determine which VM families support encryption at host.

Azure portal

When creating a Batch pool in the Azure portal, select either OsDisk, TemporaryDisk or OsAndTemporaryDisk under Disk Encryption Configuration.

Screenshot of the Disk Encryption Configuration option in the Azure portal.

After the pool is created, you can see the disk encryption configuration targets in the pool's Properties section.

Screenshot showing the disk encryption configuration targets in the Azure portal.

Examples

The following examples show how to encrypt the OS and temporary disks on a Batch pool using the Batch .NET SDK, the Batch REST API, and the Azure CLI.

Batch .NET SDK

C# 
pool.VirtualMachineConfiguration.DiskEncryptionConfiguration = new DiskEncryptionConfiguration(
    targets: new List<DiskEncryptionTarget> { DiskEncryptionTarget.OsDisk, DiskEncryptionTarget.TemporaryDisk }
    );

Batch REST API

REST API URL:

POST {batchURL}/pools?api-version=2020-03-01.11.0
client-request-id: 00000000-0000-0000-0000-000000000000

Request body:

"pool": {
    "id": "pool2",
    "vmSize": "standard_a1",
    "virtualMachineConfiguration": {
        "imageReference": {
            "publisher": "Canonical",
            "offer": "UbuntuServer",
            "sku": "22.04-LTS"
        },
        "diskEncryptionConfiguration": {
            "targets": [
                "OsDisk",
                "TemporaryDisk"
            ]
        }
        "nodeAgentSKUId": "batch.node.ubuntu 22.04"
    },
    "resizeTimeout": "PT15M",
    "targetDedicatedNodes": 5,
    "targetLowPriorityNodes": 0,
    "taskSlotsPerNode": 3,
    "enableAutoScale": false,
    "enableInterNodeCommunication": false
}

Azure CLI

Azure CLI 
az batch pool create \
    --id diskencryptionPool \
    --vm-size Standard_DS1_V2 \
    --target-dedicated-nodes 2 \
    --image canonical:ubuntuserver:22.04-LTS \
    --node-agent-sku-id "batch.node.ubuntu 22.04" \
    --disk-encryption-targets OsDisk TemporaryDisk

Next steps