# Starting worker with python subprocess is not working properly

**URL:** <https://discuss.ray.io/t/starting-worker-with-python-subprocess-is-not-working-properly/11211>\
**Category:** Ray Clusters\
**Created:** [June 30, 2023, 10:54am UTC](https://discuss.ray.io/t/starting-worker-with-python-subprocess-is-not-working-properly/11211 "2023-06-30T10:54:34Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![bananajoe182](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/bananajoe182/32/3452_2.png) [@bananajoe182](https://discuss.ray.io/u/bananajoe182)\
**Post date:** [June 30, 2023, 10:54am UTC](https://discuss.ray.io/t/starting-worker-with-python-subprocess-is-not-working-properly/11211/1 "2023-06-30T10:54:34Z")

</div>

**How severe does this issue affect your experience of using Ray?**

- Medium: It contributes to significant difficulty to complete my task, but I can work around it.

Hi,  
I’m starting workers for a Ray Cluster via python subprocess to be able to control the worker via Python. This way I can start and stop the worker in a constantly running python service

```auto
process = subprocess.Popen(f"cmd.exe /K ray start --address={RAY_HEAD_ADDRESS} --node-ip-address={WORKER_IP}",
                               env=env,
                               cwd=working_directory, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE)

```

The worker connects to the cluster but when I start deploying stuff I get an error when Ray tries to deploy something to that worker:

> (raylet, ip=10.14.82.48) [2023-06-30 11:34:31,103 E 18216 16928] (raylet.exe) worker\_pool.cc:544: Some workers of the worker process(18504) have not registered within the timeout. The process is still alive, probably it’s hanging during start.

It works when I start the worker from cmd line with the same command.

Does the python subprocess somehow interfer with Raylet because the cmd prompt is a child process of python?

Do you have a better solution to start and control the worker from python?

I appreciate any help!