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"""
Example Airflow DAG that uses IGM-type compute operations:
* copy of Instance Template
* update template in Instance Group Manager
This DAG relies on the following OS environment variables
* GCP_PROJECT_ID - the Google Cloud project where the Compute Engine instance exists
* GCE_ZONE - the zone where the Compute Engine instance exists
Variables for copy template operator:
* GCE_TEMPLATE_NAME - name of the template to copy
* GCE_NEW_TEMPLATE_NAME - name of the new template
* GCE_NEW_DESCRIPTION - description added to the template
Variables for update template in Group Manager:
* GCE_INSTANCE_GROUP_MANAGER_NAME - name of the Instance Group Manager
* SOURCE_TEMPLATE_URL - url of the template to replace in the Instance Group Manager
* DESTINATION_TEMPLATE_URL - url of the new template to set in the Instance Group Manager
"""
import os
from datetime import datetime
from airflow import models
from airflow.models.baseoperator import chain
from airflow.providers.google.cloud.operators.compute import (
ComputeEngineCopyInstanceTemplateOperator,
ComputeEngineInstanceGroupUpdateManagerTemplateOperator,
)
[docs]GCP_PROJECT_ID = os.environ.get('GCP_PROJECT_ID', 'example-project')
[docs]GCE_ZONE = os.environ.get('GCE_ZONE', 'europe-west1-b')
# [START howto_operator_compute_template_copy_args]
[docs]GCE_TEMPLATE_NAME = os.environ.get('GCE_TEMPLATE_NAME', 'instance-template-test')
[docs]GCE_NEW_TEMPLATE_NAME = os.environ.get('GCE_NEW_TEMPLATE_NAME', 'instance-template-test-new')
[docs]GCE_NEW_DESCRIPTION = os.environ.get('GCE_NEW_DESCRIPTION', 'Test new description')
[docs]GCE_INSTANCE_TEMPLATE_BODY_UPDATE = {
"name": GCE_NEW_TEMPLATE_NAME,
"description": GCE_NEW_DESCRIPTION,
"properties": {"machineType": "n1-standard-2"},
}
# [END howto_operator_compute_template_copy_args]
# [START howto_operator_compute_igm_update_template_args]
[docs]GCE_INSTANCE_GROUP_MANAGER_NAME = os.environ.get('GCE_INSTANCE_GROUP_MANAGER_NAME', 'instance-group-test')
[docs]SOURCE_TEMPLATE_URL = os.environ.get(
'SOURCE_TEMPLATE_URL',
"https://www.googleapis.com/compute/beta/projects/"
+ GCP_PROJECT_ID
+ "/global/instanceTemplates/instance-template-test",
)
[docs]DESTINATION_TEMPLATE_URL = os.environ.get(
'DESTINATION_TEMPLATE_URL',
"https://www.googleapis.com/compute/beta/projects/"
+ GCP_PROJECT_ID
+ "/global/instanceTemplates/"
+ GCE_NEW_TEMPLATE_NAME,
)
[docs]UPDATE_POLICY = {
"type": "OPPORTUNISTIC",
"minimalAction": "RESTART",
"maxSurge": {"fixed": 1},
"minReadySec": 1800,
}
# [END howto_operator_compute_igm_update_template_args]
with models.DAG(
'example_gcp_compute_igm',
schedule_interval='@once', # Override to match your needs
start_date=datetime(2021, 1, 1),
catchup=False,
tags=['example'],
) as dag:
# [START howto_operator_gce_igm_copy_template]
[docs] gce_instance_template_copy = ComputeEngineCopyInstanceTemplateOperator(
project_id=GCP_PROJECT_ID,
resource_id=GCE_TEMPLATE_NAME,
body_patch=GCE_INSTANCE_TEMPLATE_BODY_UPDATE,
task_id='gcp_compute_igm_copy_template_task',
)
# [END howto_operator_gce_igm_copy_template]
# Added to check for idempotence
# [START howto_operator_gce_igm_copy_template_no_project_id]
gce_instance_template_copy2 = ComputeEngineCopyInstanceTemplateOperator(
resource_id=GCE_TEMPLATE_NAME,
body_patch=GCE_INSTANCE_TEMPLATE_BODY_UPDATE,
task_id='gcp_compute_igm_copy_template_task_2',
)
# [END howto_operator_gce_igm_copy_template_no_project_id]
# [START howto_operator_gce_igm_update_template]
gce_instance_group_manager_update_template = ComputeEngineInstanceGroupUpdateManagerTemplateOperator(
project_id=GCP_PROJECT_ID,
resource_id=GCE_INSTANCE_GROUP_MANAGER_NAME,
zone=GCE_ZONE,
source_template=SOURCE_TEMPLATE_URL,
destination_template=DESTINATION_TEMPLATE_URL,
update_policy=UPDATE_POLICY,
task_id='gcp_compute_igm_group_manager_update_template',
)
# [END howto_operator_gce_igm_update_template]
# Added to check for idempotence (and without UPDATE_POLICY)
# [START howto_operator_gce_igm_update_template_no_project_id]
gce_instance_group_manager_update_template2 = ComputeEngineInstanceGroupUpdateManagerTemplateOperator(
resource_id=GCE_INSTANCE_GROUP_MANAGER_NAME,
zone=GCE_ZONE,
source_template=SOURCE_TEMPLATE_URL,
destination_template=DESTINATION_TEMPLATE_URL,
task_id='gcp_compute_igm_group_manager_update_template_2',
)
# [END howto_operator_gce_igm_update_template_no_project_id]
chain(
gce_instance_template_copy,
gce_instance_template_copy2,
gce_instance_group_manager_update_template,
gce_instance_group_manager_update_template2,
)
