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Copy file name to clipboardExpand all lines: articles/virtual-machine-scale-sets/virtual-machine-scale-sets-troubleshoot.md
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# Troubleshooting autoscale with Virtual Machine Scale Sets
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**Problem** – you’ve created an autoscaling infrastructure in Azure Resource Manager using virtual machine scale sets – for example, by deploying a template like this one: https://github.com/Azure/azure-quickstart-templates/tree/master/application-workloads/python/vmss-bottle-autoscale/azuredeploy.json – you have your scale rules defined and it works great, except no matter how much load you put on the VMs, it doesn't autoscale.
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**Problem** – you’ve created an autoscaling infrastructure in Azure Resource Manager using virtual machine scale sets – for example, by deploying a template like this one: https://github.com/Azure/azure-quickstart-templates/blob/master/application-workloads/python/vmss-bottle-autoscale/azuredeploy.parameters.json – you have your scale rules defined and it works great, except no matter how much load you put on the VMs, it doesn't autoscale.
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## Troubleshooting steps
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Some things to consider include:
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The Azure Resource Explorer is an indispensable troubleshooting tool that shows you the state of your Azure Resource Manager resources. Click on your subscription and look at the Resource Group you are troubleshooting. Under the Compute resource provider, look at the virtual machine scale set you created and check the Instance View, which shows you the state of a deployment. Also, check the instance view of VMs in the virtual machine scale set. Then, go into the Microsoft.Insights resource provider and check that the autoscale rules look right.
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* Is the Diagnostic extension working and emitting performance data?
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**Update:** Azure autoscale has been enhanced to use a host-based metrics pipeline, which no longer requires a diagnostics extension to be installed. The next few paragraphs no longer apply if you create an autoscaling application using the new pipeline. An example of Azure templates that have been converted to use the host pipeline is available here: https://github.com/Azure/azure-quickstart-templates/tree/master/application-workloads/python/vmss-bottle-autoscale/azuredeploy.json.
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**Update:** Azure autoscale has been enhanced to use a host-based metrics pipeline, which no longer requires a diagnostics extension to be installed. The next few paragraphs no longer apply if you create an autoscaling application using the new pipeline. An example of Azure templates that have been converted to use the host pipeline is available here: https://github.com/Azure/azure-quickstart-templates/blob/master/application-workloads/python/vmss-bottle-autoscale/azuredeploy.parameters.json.
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Using host-based metrics for autoscale is better for the following reasons:
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