Adding Log Analytics VM Extension to VM Scale Set with PowerShell

add-log-analytics-ext-arm-tmpl.json

{
    "name": "[concat(variables('vmNodeType0Name'),'OMS')]",
    "properties": {
        "publisher": "Microsoft.EnterpriseCloud.Monitoring",
        "type": "MicrosoftMonitoringAgent",
        "typeHandlerVersion": "1.0",
        "autoUpgradeMinorVersion": true,
        "settings": {
            "workspaceId": "[reference(resourceId('Microsoft.OperationalInsights/workspaces/', parameters('omsWorkspacename')), '2015-11-01-preview').customerId]"
        },
        "protectedSettings": {
            "workspaceKey": "[listKeys(resourceId('Microsoft.OperationalInsights/workspaces/', parameters('omsWorkspacename')),'2015-11-01-preview').primarySharedKey]"
        }
    }
}

add-log-analytics-ext.ps1

# https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-health-extension

# DEPLOY AFTER SCALE SET

# scale set info
$scaleSetName = "<name of scale set>"
$scaleSetResourceGroup = "<name of resource group the vmss belongs to>"
$workspaceResourceGroupName = "<name of the resource group that the workspace is in"

# get the workspace and then id
$workspace = Get-AzOperationalInsightsWorkspace -ResourceGroupName $workspaceResourceGroupName
Write-Output $workspace

$sharedKeys = Get-AzOperationalInsightsWorkspaceSharedKeys -Name $workspace.Name -ResourceGroupName $workspace.ResourceGroupName  
$workspaceId = $sharedKeys.PrimarySharedKey

# set the id and key to use as parameters for the deployment
$parameters = @{
  workspaceId = $workspace.CustomerId.ToString();
  workspaceKey = $workspaceId;
}

# Get information about the scale set
$vmss = Get-AzVmss -ResourceGroupName $scaleSetResourceGroup -VMScaleSetName $scaleSetName

Add-AzVmssExtension `
-VirtualMachineScaleSet $vmss `
-Name "Microsoft.EnterpriseCloud.Monitoring" `
-Publisher "Microsoft.EnterpriseCloud.Monitoring" `
-Type "MicrosoftMonitoringAgent" `
-TypeHandlerVersion 1.0 `
-AutoUpgradeMinorVersion $true `
-Setting @{ "workspaceId" = $parameters.workspaceId } `
-ProtectedSetting @{ "workspaceKey" = $parameters.workspaceKey }

# Update the scale set and apply the Custom Script Extension to the VM instances
Update-AzVmss `
-ResourceGroupName $vmss.ResourceGroupName `
-Name $vmss.Name `
-VirtualMachineScaleSet $vmss

add-log-analytics-ext.sh

az vmss extension set --name MicrosoftMonitoringAgent \
  --publisher Microsoft.EnterpriseCloud.Monitoring \
  --resource-group <nameOfResourceGroup> \
  --vmss-name <nameOfNodeType> \
  --settings "{'workspaceId':'<Log AnalyticsworkspaceId>'}" \
  --protected-settings "{'workspaceKey':'<Log AnalyticsworkspaceKey>'}"

add-log-analytics.json

{
  "name": "myHealthExtension",
  "properties": {
    "publisher": " Microsoft.ManagedServices",
    "type": "< ApplicationHealthWindows>",
    "autoUpgradeMinorVersion": true,
    "typeHandlerVersion": "1.0",
    "settings": {
      "protocol": "<protocol>",
      "port": "<port>",
      "requestPath": "</requestPath>"
    }
  }
}