pool_configuration.json

{
    "id": "${POOL_ID}",
    "vmSize": "Standard_D2_v2",
    "virtualMachineConfiguration": {
        "imageReference": {
            "publisher": "microsoft-azure-batch",
            "offer": "ubuntu-server-container",
            "sku": "16-04-lts",
            "version": "latest"
        },
        "nodeAgentSKUId": "batch.node.ubuntu 16.04",
        "containerConfiguration": {
            "type": "dockerCompatible",
            "containerRegistries": [
                {
                    "registryServer": "${ACR_REGISTRY}",
                    "username": "${CLIENT_ID}",
                    "password": "${CLIENT_SECRET}"
                }
            ]
        }
    },
    "maxTasksPerNode": 1,
    "taskSchedulingPolicy": {
        "nodeFillType": "spread"
    },
    "enableAutoScale": true,
    "autoScaleFormula": "$TargetDedicated=1;",
    "autoScaleEvaluationInterval": "PT5H"
}