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"""
Example Airflow DAG that starts, stops and sets the machine type of a Google Compute
Engine instance.
This DAG relies on the following OS environment variables
* GCP_PROJECT_ID - Google Cloud Platform project where the Compute Engine instance exists.
* GCE_ZONE - Google Cloud Platform zone where the instance exists.
* GCE_INSTANCE - Name of the Compute Engine instance.
* GCE_SHORT_MACHINE_TYPE_NAME - Machine type resource name to set, e.g. 'n1-standard-1'.
See https://cloud.google.com/compute/docs/machine-types
"""
import os
import airflow
from airflow import models
from airflow.contrib.operators.gcp_compute_operator import GceInstanceStartOperator, \
GceInstanceStopOperator, GceSetMachineTypeOperator
# [START howto_operator_gce_args_common]
GCP_PROJECT_ID = os.environ.get('GCP_PROJECT_ID', 'example-project')
GCE_ZONE = os.environ.get('GCE_ZONE', 'europe-west1-b')
GCE_INSTANCE = os.environ.get('GCE_INSTANCE', 'testinstance')
# [END howto_operator_gce_args_common]
default_args = {
'start_date': airflow.utils.dates.days_ago(1),
}
# [START howto_operator_gce_args_set_machine_type]
GCE_SHORT_MACHINE_TYPE_NAME = os.environ.get('GCE_SHORT_MACHINE_TYPE_NAME', 'n1-standard-1')
SET_MACHINE_TYPE_BODY = {
'machineType': 'zones/{}/machineTypes/{}'.format(GCE_ZONE, GCE_SHORT_MACHINE_TYPE_NAME)
}
# [END howto_operator_gce_args_set_machine_type]
with models.DAG(
'example_gcp_compute',
default_args=default_args,
schedule_interval=None # Override to match your needs
) as dag:
# [START howto_operator_gce_start]
gce_instance_start = GceInstanceStartOperator(
project_id=GCP_PROJECT_ID,
zone=GCE_ZONE,
resource_id=GCE_INSTANCE,
task_id='gcp_compute_start_task'
)
# [END howto_operator_gce_start]
# Duplicate start for idempotence testing
# [START howto_operator_gce_start_no_project_id]
gce_instance_start2 = GceInstanceStartOperator(
zone=GCE_ZONE,
resource_id=GCE_INSTANCE,
task_id='gcp_compute_start_task2'
)
# [END howto_operator_gce_start_no_project_id]
# [START howto_operator_gce_stop]
gce_instance_stop = GceInstanceStopOperator(
project_id=GCP_PROJECT_ID,
zone=GCE_ZONE,
resource_id=GCE_INSTANCE,
task_id='gcp_compute_stop_task'
)
# [END howto_operator_gce_stop]
# Duplicate stop for idempotence testing
# [START howto_operator_gce_stop_no_project_id]
gce_instance_stop2 = GceInstanceStopOperator(
zone=GCE_ZONE,
resource_id=GCE_INSTANCE,
task_id='gcp_compute_stop_task2'
)
# [END howto_operator_gce_stop_no_project_id]
# [START howto_operator_gce_set_machine_type]
gce_set_machine_type = GceSetMachineTypeOperator(
project_id=GCP_PROJECT_ID,
zone=GCE_ZONE,
resource_id=GCE_INSTANCE,
body=SET_MACHINE_TYPE_BODY,
task_id='gcp_compute_set_machine_type'
)
# [END howto_operator_gce_set_machine_type]
# Duplicate set machine type for idempotence testing
# [START howto_operator_gce_set_machine_type_no_project_id]
gce_set_machine_type2 = GceSetMachineTypeOperator(
zone=GCE_ZONE,
resource_id=GCE_INSTANCE,
body=SET_MACHINE_TYPE_BODY,
task_id='gcp_compute_set_machine_type2'
)
# [END howto_operator_gce_set_machine_type_no_project_id]
gce_instance_start >> gce_instance_start2 >> gce_instance_stop >> \
gce_instance_stop2 >> gce_set_machine_type >> gce_set_machine_type2