computeengine-example.yaml

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# Example of controlling Compute Engine instances (failover-like setup)

# We'll employ a lock file to prevent this function from running concurrently
concurrency:
  bucket: add-a-bucket-here

pipeline:
  - type: processor.genericjson
  - type: processor.computeengine
    output: primary
    config:
      mode: instances.get
      zone: europe-west4-c
      instance: failover-primary
  - type: output.logger
    config:
      message: |
        Primary instance: {{ primary|json_encode }}
  - type: processor.computeengine # Make an instant snapshot of the disk before stopping the instance
    canFail: true
    config:
      mode: disks.instantSnapshots.create
      region: europe-west4
      disk: projects/example-project/regions/europe-west4/disks/failover-regional-disk-1
      snapshotName: "failover-regional-disk-1-{{ ''|utc_strftime('%Y%m%d-%H%M%S') }}"
  - type: processor.computeengine # Only keep 3 last snapshots
    canFail: true
    config:
      mode: disks.instantSnapshots.purge
      region: europe-west4
      snapshotName: "^failover-regional-disk-1-"
      maxSnapshots: 3
  - type: processor.computeengine # Stop the instance
    canFail: true
    config:
      mode: instances.stop
      zone: europe-west4-c
      instance: failover-primary
  - type: processor.computeengine # Attempt to detach the disk politely
    canFail: true
    config:
      mode: instances.detachdisk
      zone: europe-west4-c
      instance: failover-primary
      disk: projects/example-project/regions/europe-west4/disks/failover-regional-disk-1
      # deviceName: failover-regional-disk-1
  - type: processor.computeengine # Attach the disk to the other instance, forcibly
    config:
      mode: instances.attachdisk
      zone: europe-west4-b
      instance: failover-secondary
      disk: projects/example-project/regions/europe-west4/disks/failover-regional-disk-1
      deviceName: failover-regional-disk-1
      forceAttach: true
  - type: processor.computeengine # Start the other instance
    canFail: true
    config:
      mode: instances.start
      zone: europe-west4-b
      instance: failover-secondary
  - type: processor.loadbalancing # Update the backend service with a UMIG containing the spun up instance
    config:
      mode: regionbackendservice.patch
      region: "europe-west4"
      backendService: "l4-backend-service"
      patch:
        backends:
          - group: "https://www.googleapis.com/compute/v1/projects/example-project/zones/europe-west4-c/instanceGroups/secondary-mig"