How to get logs from inside the container executed using DockerOperator?(Airflow)

Question

I'm facing logging issues with DockerOperator.

I'm running a python script inside the docker container using DockerOperator and I need airflow to spit out the logs from the python script running inside the container. Airlfow is marking the job as success but the script inside the container is failing and I have no clue of what is going as I cannot see the logs properly. Is there way to set up logging for DockerOpertor apart from setting up tty option to True as suggested in docs

Answer 1

It looks like you can have logs pushed to XComs, but it's off by default. First, you need to pass xcom_push=True for it to at least start sending the last line of output to XCom. Then additionally, you can pass xcom_all=True to send all output to XCom, not just the first line.

Perhaps not the most convenient place to put debug information, but it's pretty accessible in the UI at least either in the XCom tab when you click into a task or there's a page you can list and filter XComs (under Browse).

Source: https://github.com/apache/airflow/blob/1.10.10/airflow/operators/docker_operator.py#L112-L117 and https://github.com/apache/airflow/blob/1.10.10/airflow/operators/docker_operator.py#L248-L250