compute

Example Airflow DAG that starts, stops and sets the machine type of a Google Compute Engine instance.

Compute


Providers:

Run this DAG

1. Install Astronomer CLISkip if you already have the CLI

2. Initate the project:

3. Copy and paste the code below into a file in the

dags
directory.

4. Add the following to your requirements.txt file:

5. Run the DAG:

#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
"""
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 project where the Compute Engine instance exists.
* GCE_ZONE - Google Cloud 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
from airflow import models
from airflow.providers.google.cloud.operators.compute import (
ComputeEngineSetMachineTypeOperator,
ComputeEngineStartInstanceOperator,
ComputeEngineStopInstanceOperator,
)
from airflow.utils.dates import days_ago
# [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]
GCE_SHORT_MACHINE_TYPE_NAME = os.environ.get('GCE_SHORT_MACHINE_TYPE_NAME', 'n1-standard-1')
with models.DAG(
'example_gcp_compute',
schedule_interval=None, # Override to match your needs
start_date=days_ago(1),
tags=['example'],
) as dag:
# [START howto_operator_gce_start]
gce_instance_start = ComputeEngineStartInstanceOperator(
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 = ComputeEngineStartInstanceOperator(
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 = ComputeEngineStopInstanceOperator(
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 = ComputeEngineStopInstanceOperator(
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 = ComputeEngineSetMachineTypeOperator(
project_id=GCP_PROJECT_ID,
zone=GCE_ZONE,
resource_id=GCE_INSTANCE,
body={'machineType': f'zones/{GCE_ZONE}/machineTypes/{GCE_SHORT_MACHINE_TYPE_NAME}'},
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 = ComputeEngineSetMachineTypeOperator(
zone=GCE_ZONE,
resource_id=GCE_INSTANCE,
body={'machineType': f'zones/{GCE_ZONE}/machineTypes/{GCE_SHORT_MACHINE_TYPE_NAME}'},
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_instance_stop2 >> gce_set_machine_type >> gce_set_machine_type2