i have created a docker worker on a server and trying to run my private docker image, but this error occues as it could not fetch docker image due to docker not able to login to registry.

@Marvin can you help with the issue, i am facing the same issue.

Could you please provide more details about the issue you're facing? Are you encountering a specific error message or challenge while using Prefect? Also, do you know which version of Prefect you're using? This will help me assist you more effectively.

@Marvin Let me start from the beginning I have perfect server running with these configuration using docker compose version: '3.8' services: postgres: image: postgres:16.4 container_name: prefect-postgres environment: POSTGRES_USER: postgres POSTGRES_PASSWORD: yourTopSecretPassword POSTGRES_DB: prefect volumes: - prefectdb:/var/lib/postgresql/data healthcheck: test: ["CMD-SHELL", "pg_isready -U postgres -d prefect"] interval: 10s timeout: 5s retries: 5 prefect-server: image: prefecthq/prefect:3.0.3-python3.12 container_name: prefect-server command: ["prefect", "server", "start"] environment: - PREFECT_API_URL=http://0.0.0.0:4200/api - PREFECT_API_DATABASE_CONNECTION_URL=postgresql+asyncpg://postgres:yourTopSecretPassword@postgres:5432/prefect - PREFECT_SERVER_API_HOST=0.0.0.0 - PREFECT_SERVER_API_PORT=4200 - PREFECT_UI_API_URL=http://my-server-ip:4200/api - PREFECT_UI_URL=http://my-server-ip:4200 ports: - "4200:4200" depends_on: postgres: condition: service_healthy volumes: - ./prefect:/root/.prefect volumes: prefectdb: and it is working fine. Now I created a block docker registry credentials in blocks and created a work pool test-docker-pool with default options and used docker registry credentials with it. Now on another server I have made a docker worker using these configurations # Dockerfile FROM prefecthq/prefect:3.0.3-python3.12 # Install necessary dependencies for docker worker pool RUN pip install prefect-docker and running it using this docker compose version: '3.8' services: prefect-worker: build: context: . dockerfile: Dockerfile container_name: prefect-worker command: ["prefect", "worker", "start", "--pool", "test-docker-pool"] environment: - PREFECT_API_URL=http://139.59.56.49:4200/api - PREFECT_DOCKER_REGISTRY_CREDENTIALS=docker-creds restart: unless-stopped Now that all things ready I have a docker image of a scraper in my private docker repository but when I run it, it says not being able to authenticate with docker, below is the actual error response from running a deployment Worker 'DockerWorker 77b8fa83-b114-48c2-adb7-cbbdc9f05ce8' submitting flow run '2a30cd88-8bc1-4ded-9cb5-f8b70d973a7d' 084224 PM prefect.flow_runs.worker Failed to submit flow run '2a30cd88-8bc1-4ded-9cb5-f8b70d973a7d' to infrastructure. Traceback (most recent call last): File "/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py", line 789, in urlopen response = self._make_request( ^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py", line 495, in _make_request conn.request( File "/usr/local/lib/python3.12/site-packages/urllib3/connection.py", line 441, in request self.endheaders() File "/usr/local/lib/python3.12/http/client.py", line 1331, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) File "/usr/local/lib/python3.12/http/client.py", line 1091, in _send_output self.send(msg) File "/usr/local/lib/python3.12/http/client.py", line 1035, in send self.connect() File "/usr/local/lib/python3.12/site-packages/docker/transport/unixconn.py", line 26, 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 "/usr/local/lib/python3.12/site-packages/requests/adapters.py", line 667, in send resp = conn.urlopen( ^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py", line 843, in urlopen retries = retries.increment( ^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/urllib3/util/retry.py", line 474, in increment raise reraise(type(error), error, _stacktrace) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/urllib3/util/util.py", line 38, in reraise raise value.with_traceback(tb) File "/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py", line 789, in urlopen response = self._make_request( ^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py", line 495, in _make_request conn.request( File "/usr/local/lib/python3.12/site-packages/urllib3/connection.py", line 441, in request self.endheaders() File "/usr/local/lib/python3.12/http/client.py", line 1331, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) File "/usr/local/lib/python3.12/http/client.py", line 1091, in _send_output self.send(msg) File "/usr/local/lib/python3.12/http/client.py", line 1035, in send self.connect() File "/usr/local/lib/python3.12/site-packages/docker/transport/unixconn.py", line 26, 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 "/usr/local/lib/python3.12/site-packages/docker/api/client.py", line 223, in _retrieve_server_version return self.version(api_version=False)["ApiVersion"] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/docker/api/daemon.py", line 181, in version return self._result(self._get(url), json=True) ^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/docker/utils/decorators.py", line 44, in inner return f(self, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/docker/api/client.py", line 246, in _get return self.get(url, **self._set_request_timeout(kwargs)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/requests/sessions.py", line 602, in get return self.request("GET", url, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/requests/sessions.py", line 589, in request resp = self.send(prep, **send_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/requests/sessions.py", line 703, in send r = adapter.send(request, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/requests/adapters.py", line 682, in send raise ConnectionError(err, request=request) requests.exceptions.ConnectionError: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory')) The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/usr/local/lib/python3.12/site-packages/prefect_docker/worker.py", line 468, in _get_client docker_client = docker.from_env() ^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/docker/client.py", line 94, in from_env return cls( ^^^^ File "/usr/local/lib/python3.12/site-packages/docker/client.py", line 45, in init self.api = APIClient(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/docker/api/client.py", line 207, in init self._version = self._retrieve_server_version() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/docker/api/client.py", line 230, in _retrieve_server_version raise DockerException( docker.errors.DockerException: Error while fetching server API version: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory')) The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/usr/local/lib/python3.12/site-packages/prefect/workers/base.py", line 883, in _submit_run_and_capture_errors result = await self.run( ^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/prefect_docker/worker.py", line 436, in run container, created_event = await run_sync_in_worker_thread( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/prefect/utilities/asyncutils.py", line 269, in run_sync_in_worker_thread result = await anyio.to_thread.run_sync( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/anyio/to_thread.py", line 56, in run_sync return await get_async_backend().run_sync_in_worker_thread( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 2357, in run_sync_in_worker_thread return await future ^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 864, in run result = context.run(func, *args) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/prefect/utilities/asyncutils.py", line 279, in call_with_mark return call() ^^^^^^ File "/usr/local/lib/python3.12/site-packages/prefect_docker/worker.py", line 531, in _create_and_start_container docker_client = self._get_client() ^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/prefect_docker/worker.py", line 471, in _get_client raise RuntimeError("Could not connect to Docker.") from exc RuntimeError: Could not connect to Docker. 084224 PM prefect.flow_runs.worker Reported flow run '2a30cd88-8bc1-4ded-9cb5-f8b70d973a7d' as crashed: Flow run could not be submitted to infrastructure Can you please guide me, I am not able to resolve this issue.

Your message was too long by 2357 tokens - please shorten it and try again. For reference, here's your message at the allowed limit:

Let me start from the beginning I have perfect server running with these configuration using docker compose

version: '3.8' services: postgres: image: postgres:16.4 container_name: prefect-postgres environment: POSTGRES_USER: postgres POSTGRES_PASSWORD: yourTopSecretPassword POSTGRES_DB: prefect volumes: - prefectdb:/var/lib/postgresql/data healthcheck: test: ["CMD-SHELL", "pg_isready -U postgres -d prefect"] interval: 10s timeout: 5s retries: 5 prefect-server: image: prefecthq/prefect:3.0.3-python3.12 container_name: prefect-server command: ["prefect", "server", "start"] environment: - PREFECT_API_URL=http://0.0.0.0:4200/api - PREFECT_API_DATABASE_CONNECTION_URL=postgresql+asyncpg://postgres:yourTopSecretPassword@postgres:5432/prefect - PREFECT_SERVER_API_HOST=0.0.0.0 - PREFECT_SERVER_API_PORT=4200 - PREFECT_UI_API_URL=<http://

Could not connect to Docker.

is docker running?

Yes

what is the output of this where your worker is running?

docker info | grep -E 'Server Version|Storage Driver|Running'

My worker is running in a docker container like described above. I have made a dockerfile using prefect-docker library and run the worker as docker compose Here is the requested output WARNING: bridge-nf-call-iptables is disabled Running: 3 WARNING: bridge-nf-call-ip6tables is disabled Server Version: 27.3.0 Storage Driver: overlay2

Your message was too long by 543 tokens - please shorten it and try again. For reference, here's your message at the allowed limit:

i am using prefect 3 and deployed the worker using systems service described in the docs now when I run the deployment I am facing the authentication issue from docker

Failed to submit flow run 'dbae8cd1-0d9f-4ffe-9fcc-faa1e466de2f' to infrastructure. Traceback (most recent call last): File "/usr/local/lib/python3.10/dist-packages/docker/api/client.py", line 275, in _raise_for_status response.raise_for_status() File "/usr/local/lib/python3.10/dist-packages/requests/models.py", line 1024, in raise_for_status raise HTTPError(http_error_msg, response=self) requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: http+docker://localhost/v1.47/auth The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/usr/local/lib/python3.10/dist-packages/prefect/workers/base.py", line 889, in _submit_run_and_capture_errors result = await self.run( File "/usr/local/lib/python3.10/dist-packages/prefect_docker/worker.py", line 436, in run container, created_event = await run_sync_in_worker_thread( File "/usr/local/lib/python3.10/dist-pack

@Marvin i am using prefect 3 and deployed the worker using systems service described in the docs now when I run the deployment I am facing the authentication issue from docker Failed to submit flow run 'dbae8cd1-0d9f-4ffe-9fcc-faa1e466de2f' to infrastructure. Traceback (most recent call last): File "/usr/local/lib/python3.10/dist-packages/docker/api/client.py", line 275, in _raise_for_status response.raise_for_status() File "/usr/local/lib/python3.10/dist-packages/requests/models.py", line 1024, in raise_for_status raise HTTPError(http_error_msg, response=self) requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: http+docker://localhost/v1.47/auth The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/usr/local/lib/python3.10/dist-packages/prefect/workers/base.py", line 889, in _submit_run_and_capture_errors result = await self.run( File "/ return self.api.login(*args, **kwargs) File "/usr/local/lib/python3.10/dist-packages/docker/api/daemon.py", line 152, in login return self._result(response, json=True)

It seems you're experiencing an authentication issue with Docker when running a Prefect deployment. Here are some steps you can take to resolve it: 1. Docker Authentication: - Ensure that Docker is running and that you're logged in to your Docker registry. You can log in using the following command:

docker login

Make sure you're entering the correct credentials for your Docker registry. If you're using a private registry, ensure the credentials provided are correct. 2. Prefect Configuration: - If you have set up a system service for Prefect worker or serve processes using

systemd

, double-check that the service is running correctly and has the necessary permissions. Refer to the Daemonize Processes Guide for setting up services properly. - Ensure that you have entered the correct configuration for the Docker infrastructure block in your Prefect deployment. You may need to specify Docker registry credentials if pulling images from a private registry. More details can be found in the Infrastructure Concepts of Prefect 3.x. 3. Troubleshooting Tips: - Refer to the General Troubleshooting Guide for Prefect. It’s important to ensure that your Prefect setup is up-to-date and configured correctly. 4. Related GitHub Discussions: - There have been discussions on adding a

DockerRegistry

block with a login capability which involves specifying registry authentication directly in the Prefect configurations. See PrefectHQ GitHub Issue #6303. Try these steps, and if you still face issues, please let me know with more specific details, and I can help you further troubleshoot.

@Marvin I have created a docker registry and include that when I created a docker work pool , so how do I access the private docker registry on docker hub and pull images in that docker worker

To access a private Docker registry when using a Docker worker pool in Prefect 3.x, you need to configure your Docker worker pool to authenticate with the registry. Here’s how you can set this up: 1. Authenticate with Docker Hub: If your images are hosted on Docker Hub, you need to authenticate your Docker daemon to access your private registry. Use the following command to log in to Docker Hub:

docker login

This will prompt you to enter your Docker Hub username and password. 2. Configure Docker Worker Pool in Prefect: When configuring the Docker infrastructure in Prefect, you need to ensure that your worker pool has the required credentials to access the private registry. This typically involves setting environment variables and configurations in your deployment or worker pool settings. 3. Environment Variables: You can add environment variables in your configuration to ensure that the worker can authenticate and pull the necessary images. Refer to the configuration options available when setting up work pools. 4. Documentation and Resources: Though the specific Prefect 3.x documentation link wasn’t found directly, you can check similar examples on how to set up Kubernetes work pools since they often involve similar configurations regarding authentication. By ensuring that your Prefect deployment is aware of the Docker authentication requirements and that you have configured the worker pool settings correctly, you’ll be able to pull images from the private registry. If you need more detailed guidance, feel free to specify the parts you find challenging, and I will provide additional support.