airflow-dag-example.py

from datetime import datetime

from airflow.models import DAG
from airflow.operators.dummy_operator import DummyOperator
from airflow.operators.python_operator import PythonOperator

DAG_OWNER = 'lvduyet@fossil.com'
DAG_ID = 'dag_name'
SCHEDULE_INTERVAL = '@weekly'

default_args = {
    'owner': DAG_OWNER,
    'start_date': datetime(2020, 1, 1),
    'executor_config': {
        'KubernetesExecutor': {
            'request_memory': '512Mi',
            'limit_memory': '1Gi',
            'request_cpu': '500m',
            'limit_cpu': '1000m'
        }
    },
    'retries': 3,
}


def python_task_callable(**kwargs):
    pass


def create_dag():
    dag = DAG(DAG_ID, default_args=default_args,
              schedule_interval=SCHEDULE_INTERVAL)

    start = DummyOperator(task_id='start', dag=dag)
    python_task = PythonOperator(task_id='python_task',
                                 provide_context=True,
                                 python_callable=python_task_callable,
                                 dag=dag)
    complete = DummyOperator(task_id='complete', dag=dag)
    
    start >> python_task >> complete

    return dag

globals()[DAG_ID] = create_dag()