This includes steps to create presto worker image.

worker_imager_create.sh

# De-allocate and generalize the VMs in order to create an image.
# A VM that has been generalized can no longer be restarted.

ResourceGroupName="PrestoResourceGroup"
WorkerName="presto-worker-vm"
ImageName="presto-worker-image"
Subscription="Azure-Subscription-Name"

az vm deallocate \
  --subscription $Subscription \
  --resource-group $ResourceGroupName \
  --name $WorkerName
  
az vm generalize \
  --subscription $Subscription \
  --resource-group $ResourceGroupName \
  --name $WorkerName
  
# Create an presto worker image
az image create \
  --subscription $Subscription \
  --resource-group $ResourceGroupName \
  --name $ImageName \
  --source $WorkerName