gcloud compute instance-groups list-instances  instance-group-lua --zone=us-central1-b --format='value(NAME)'


##List instance group
Compute Network Viewer
https://cloud.google.com/sdk/gcloud/reference/compute/instance-groups/list-instances


##Default service account
Read-only access to Google Cloud Storage: 
https://www.googleapis.com/auth/devstorage.read_only
Write access to write Compute Engine logs: 
https://www.googleapis.com/auth/logging.write
Write access to publish metric data to your Google Cloud projects: 
https://www.googleapis.com/auth/monitoring.write
Read-only access to Service Management features required for Google Cloud Endpoints(Alpha): 
https://www.googleapis.com/auth/service.management.readonly
Read/write access to Service Control features required for Google Cloud Endpoints(Alpha): 
https://www.googleapis.com/auth/servicecontrol