Unable to run script within Airflow DockerOperator - docker

Question

I am trying to run a simple python script within a docker run command scheduled with Airflow.
I have followed the instructions here Airflow init.
My .env file:
AIRFLOW_UID=1000
AIRFLOW_GID=0
And the docker-compose.yaml is the default one docker-compose.yaml
My dag is configured as followed:
""" this is an example dag """
from datetime import timedelta
from airflow import DAG
from airflow.operators.docker_operator import DockerOperator
from airflow.utils.dates import days_ago
from docker.types import Mount
default_args = {
'owner': 'airflow',
'depends_on_past': False,
'email': ['info#foo.com'],
'email_on_failure': True,
'email_on_retry': False,
'retries': 10,
'retry_delay': timedelta(minutes=5),
}
with DAG(
'msg_europe_etl',
default_args=default_args,
description='Process MSG_EUROPE ETL',
schedule_interval=timedelta(minutes=15),
start_date=days_ago(0),
tags=['satellite_data'],
) as dag:
download_and_store = DockerOperator(
task_id='download_and_store',
image='satellite_image:latest',
auto_remove=True,
api_version='1.41',
network_mode="overlay",
mounts=[Mount(source='/home/archive_1/archive/satellite_data',
target='/app/data'),
Mount(source='/home/dlassahn/projects/forecast-system/meteoIntelligence-satellite',
target='/app')],
command="python3 src/scripts.py download_satellite_images "
"{{ (execution_date - macros.timedelta(hours=4)).strftime('%Y-%m-%d %H:%M') }} "
"'msg_europe' ",
)
download_and_store
But I guess the error from the Airflow log comes from missing access to the socket:
[2021-08-03 16:09:19,968] {taskinstance.py:1501} ERROR - Task failed with exception
Traceback (most recent call last):
File "/home/airflow/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 677, in urlopen
chunked=chunked,
File "/home/airflow/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 392, in _make_request
conn.request(method, url, **httplib_request_kw)
File "/usr/local/lib/python3.6/http/client.py", line 1287, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/local/lib/python3.6/http/client.py", line 1333, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/usr/local/lib/python3.6/http/client.py", line 1282, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/usr/local/lib/python3.6/http/client.py", line 1042, in _send_output
self.send(msg)
File "/usr/local/lib/python3.6/http/client.py", line 980, in send
self.connect()
File "/home/airflow/.local/lib/python3.6/site-packages/docker/transport/unixconn.py", line 43, in connect
sock.connect(self.unix_socket)
FileNotFoundError: [Errno 2] No such file or directory
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/airflow/.local/lib/python3.6/site-packages/requests/adapters.py", line 449, in send
timeout=timeout
File "/home/airflow/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 727, in urlopen
method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
File "/home/airflow/.local/lib/python3.6/site-packages/urllib3/util/retry.py", line 410, in increment
raise six.reraise(type(error), error, _stacktrace)
File "/home/airflow/.local/lib/python3.6/site-packages/urllib3/packages/six.py", line 734, in reraise
raise value.with_traceback(tb)
File "/home/airflow/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 677, in urlopen
chunked=chunked,
File "/home/airflow/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 392, in _make_request
conn.request(method, url, **httplib_request_kw)
File "/usr/local/lib/python3.6/http/client.py", line 1287, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/local/lib/python3.6/http/client.py", line 1333, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/usr/local/lib/python3.6/http/client.py", line 1282, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/usr/local/lib/python3.6/http/client.py", line 1042, in _send_output
self.send(msg)
File "/usr/local/lib/python3.6/http/client.py", line 980, in send
self.connect()
File "/home/airflow/.local/lib/python3.6/site-packages/docker/transport/unixconn.py", line 43, in connect
sock.connect(self.unix_socket)
urllib3.exceptions.ProtocolError: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/models/taskinstance.py", line 1157, in _run_raw_task
self._prepare_and_execute_task_with_callbacks(context, task)
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/models/taskinstance.py", line 1331, in _prepare_and_execute_task_with_callbacks
result = self._execute_task(context, task_copy)
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/models/taskinstance.py", line 1361, in _execute_task
result = task_copy.execute(context=context)
File "/home/airflow/.local/lib/python3.6/site-packages/airflow/providers/docker/operators/docker.py", line 300, in execute
if self.force_pull or not self.cli.images(name=self.image):
File "/home/airflow/.local/lib/python3.6/site-packages/docker/api/image.py", line 98, in images
res = self._result(self._get(self._url("/images/json"), params=params),
File "/home/airflow/.local/lib/python3.6/site-packages/docker/utils/decorators.py", line 46, in inner
return f(self, *args, **kwargs)
File "/home/airflow/.local/lib/python3.6/site-packages/docker/api/client.py", line 237, in _get
return self.get(url, **self._set_request_timeout(kwargs))
File "/home/airflow/.local/lib/python3.6/site-packages/requests/sessions.py", line 555, in get
return self.request('GET', url, **kwargs)
File "/home/airflow/.local/lib/python3.6/site-packages/requests/sessions.py", line 542, in request
resp = self.send(prep, **send_kwargs)
File "/home/airflow/.local/lib/python3.6/site-packages/requests/sessions.py", line 655, in send
r = adapter.send(request, **kwargs)
File "/home/airflow/.local/lib/python3.6/site-packages/requests/adapters.py", line 498, in send
raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory'))
My Airflow Version: 2.1.2
Output of grep /etc/group -e "docker": docker:x:998:username

Answer 1

You need to map docker socket to inside the Docker container in order to make Docker Operator works. Basically you need to get "docker-in-docker" setup.
Look at the option 1) here: https://devopscube.com/run-docker-in-docker/ - it is probably what you want (you just need to add appropriate mount in the docker-compose file)