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"""
Example Airflow DAG that starts, stops and sets the machine type of a Google Compute
Engine instance.
"""
from __future__ import annotations
import os
from datetime import datetime
from airflow import models
from airflow.models.baseoperator import chain
from airflow.providers.google.cloud.hooks.compute_ssh import ComputeEngineSSHHook
from airflow.providers.google.cloud.operators.compute import (
ComputeEngineDeleteInstanceOperator,
ComputeEngineInsertInstanceOperator,
)
from airflow.providers.ssh.operators.ssh import SSHOperator
from airflow.utils.trigger_rule import TriggerRule
# [START howto_operator_gce_args_common]
[docs]ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
[docs]PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT")
[docs]DAG_ID = "cloud_compute_ssh"
[docs]LOCATION = "europe-west1-b"
[docs]GCE_INSTANCE_NAME = "instance-1"
[docs]SHORT_MACHINE_TYPE_NAME = "n1-standard-1"
[docs]GCE_INSTANCE_BODY = {
"name": GCE_INSTANCE_NAME,
"machine_type": f"zones/{LOCATION}/machineTypes/{SHORT_MACHINE_TYPE_NAME}",
"disks": [
{
"boot": True,
"device_name": GCE_INSTANCE_NAME,
"initialize_params": {
"disk_size_gb": "10",
"disk_type": f"zones/{LOCATION}/diskTypes/pd-balanced",
"source_image": "projects/debian-cloud/global/images/debian-11-bullseye-v20220621",
},
}
],
"network_interfaces": [
{
"access_configs": [{"name": "External NAT", "network_tier": "PREMIUM"}],
"stack_type": "IPV4_ONLY",
"subnetwork": f"regions/{REGION}/subnetworks/default",
}
],
}
# [END howto_operator_gce_args_common]
with models.DAG(
DAG_ID,
schedule_interval="@once",
start_date=datetime(2021, 1, 1),
catchup=False,
tags=["example"],
) as dag:
# [START howto_operator_gce_insert]
[docs] gce_instance_insert = ComputeEngineInsertInstanceOperator(
task_id="gcp_compute_create_instance_task",
project_id=PROJECT_ID,
zone=LOCATION,
body=GCE_INSTANCE_BODY,
)
# [END howto_operator_gce_insert]
# [START howto_execute_command_on_remote]
metadata_without_iap_tunnel = SSHOperator(
task_id="metadata_without_iap_tunnel",
ssh_hook=ComputeEngineSSHHook(
user="username",
instance_name=GCE_INSTANCE_NAME,
zone=LOCATION,
use_oslogin=False,
use_iap_tunnel=False,
),
command="echo metadata_without_iap_tunnel",
)
# [END howto_execute_command_on_remote]
# [START howto_operator_gce_delete_no_project_id]
gce_instance_delete = ComputeEngineDeleteInstanceOperator(
task_id="gcp_compute_delete_instance_task",
zone=LOCATION,
resource_id=GCE_INSTANCE_NAME,
)
# [END howto_operator_gce_delete_no_project_id]
gce_instance_delete.trigger_rule = TriggerRule.ALL_DONE
chain(
gce_instance_insert,
metadata_without_iap_tunnel,
gce_instance_delete,
)
# ### Everything below this line is not part of example ###
# ### Just for system tests purpose ###
from tests.system.utils.watcher import watcher
# This test needs watcher in order to properly mark success/failure
# when "tearDown" task with trigger rule is part of the DAG
list(dag.tasks) >> watcher()
from tests.system.utils import get_test_run # noqa: E402
# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
[docs]test_run = get_test_run(dag)
