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Update a deployed web service (v1)

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APPLIES TO: Azure CLI ml extension v1 Python SDK azureml v1

In this article, you learn how to update a web service that was deployed with Azure Machine Learning.

Prerequisites

  • This article assumes you have already deployed a web service with Azure Machine Learning. If you need to learn how to deploy a web service, follow these steps.

  • The code snippets in this article assume that the ws variable has already been initialized to your workspace by using the Workflow() constructor or loading a saved configuration with Workspace.from_config(). The following snippet demonstrates how to use the constructor:

    APPLIES TO: Python SDK azureml v1

    from azureml.core import Workspace
ws = Workspace(subscription_id="mysubscriptionid",
               resource_group="myresourcegroup",
               workspace_name="myworkspace")

Important

Some of the Azure CLI commands in this article use the azure-cli-ml, or v1, extension for Azure Machine Learning. Support for the v1 extension will end on September 30, 2025. You will be able to install and use the v1 extension until that date.

We recommend that you transition to the ml, or v2, extension before September 30, 2025. For more information on the v2 extension, see Azure ML CLI extension and Python SDK v2.

Update web service

To update a web service, use the update method. You can update the web service to use a new model, a new entry script, or new dependencies that can be specified in an inference configuration. For more information, see the documentation for Webservice.update.

See AKS Service Update Method.

See ACI Service Update Method.

Important

When you create a new version of a model, you must manually update each service that you want to use it.

You can not use the SDK to update a web service published from the Azure Machine Learning designer.

Important

Azure Kubernetes Service uses Blobfuse FlexVolume driver for the versions <=1.16 and Blob CSI driver for the versions >=1.17.

Therefore, it is important to re-deploy or update the web service after cluster upgrade in order to deploy to correct blobfuse method for the cluster version.

Note

When an operation is already in progress, any new operation on that same web service will respond with 409 conflict error. For example, If create or update web service operation is in progress and if you trigger a new Delete operation it will throw an error.

Using the SDK

The following code shows how to use the SDK to update the model, environment, and entry script for a web service:

APPLIES TO: Python SDK azureml v1

from azureml.core import Environment
from azureml.core.webservice import Webservice
from azureml.core.model import Model, InferenceConfig

# Register new model.
new_model = Model.register(model_path="outputs/sklearn_mnist_model.pkl",
                           model_name="sklearn_mnist",
                           tags={"key": "0.1"},
                           description="test",
                           workspace=ws)

# Use version 3 of the environment.
deploy_env = Environment.get(workspace=ws,name="myenv",version="3")
inference_config = InferenceConfig(entry_script="score.py",
                                   environment=deploy_env)

service_name = 'myservice'
# Retrieve existing service.
service = Webservice(name=service_name, workspace=ws)



# Update to new model(s).
service.update(models=[new_model], inference_config=inference_config)
service.wait_for_deployment(show_output=True)
print(service.state)
print(service.get_logs())

Using the CLI

You can also update a web service by using the ML CLI. The following example demonstrates registering a new model and then updating a web service to use the new model:

APPLIES TO: Azure CLI ml extension v1

az ml model register -n sklearn_mnist  --asset-path outputs/sklearn_mnist_model.pkl  --experiment-name myexperiment --output-metadata-file modelinfo.json
az ml service update -n myservice --model-metadata-file modelinfo.json

Tip

In this example, a JSON document is used to pass the model information from the registration command into the update command.

To update the service to use a new entry script or environment, create an inference configuration file and specify it with the ic parameter.

For more information, see the az ml service update documentation.

Next steps