instanceGroup.jinja

#Code based on: Google Cloud Documentation (2021) Creating an HTTP load-balanced logbook app. Available at: https://cloud.google.com/deployment-manager/docs/create-advanced-http-load-balanced-deployment. Last accessed 13 April 2021.
resources:
 
 #instance group to contain vm instance templates. Created with 1 instance. To be deployed if different region zones.
- name: {{ env["name"] }}-instance-group
  type: compute.v1.instanceGroupManager
  properties:
    instanceTemplate: {{ properties['instanceTemplate'] }}
    zone: {{ properties["zone"] }}
    targetSize: 1

#autoscaler which can scale the instance group to contain up to 3 instances
- name: {{ env["name"] }}-as
  type: compute.v1.autoscaler
  properties:
    zone: {{ properties["zone"] }}
    target: $(ref.{{ env["name"] }}-instance-group.selfLink)
    autoscalingPolicy:
      maxNumReplicas: 3