# Container in head node stopped unexpectedly

**URL:** <https://discuss.ray.io/t/container-in-head-node-stopped-unexpectedly/12658>\
**Category:** Ray Clusters\
**Created:** [October 31, 2023, 9:18am UTC](https://discuss.ray.io/t/container-in-head-node-stopped-unexpectedly/12658 "2023-10-31T09:18:40Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Yuneetha\_Alaparthi](https://avatars.discourse-cdn.com/v4/letter/y/b38774/32.png) [@Yuneetha\_Alaparthi](https://discuss.ray.io/u/Yuneetha_Alaparthi)\
**Post date:** [October 31, 2023, 9:18am UTC](https://discuss.ray.io/t/container-in-head-node-stopped-unexpectedly/12658/1 "2023-10-31T09:18:40Z")

</div>

I have successfully started a cluster using cluster.yaml file. After sometime, the docker container in the head node has been stopped but the container is still present in all the worker nodes.  
I have found the following information from the dashboard.log

> 2023-10-30 11:30:39,452 WARNING worker.py:2006 – The autoscaler failed with the following error:  
> Terminated with signal 15  
> File “/usr/local/lib/python3.8/dist-packages/ray/autoscaler/\_private/monitor.py”, line 720, in   
> monitor.run()  
> File “/usr/local/lib/python3.8/dist-packages/ray/autoscaler/\_private/monitor.py”, line 595, in run  
> self.\_run()  
> File “/usr/local/lib/python3.8/dist-packages/ray/autoscaler/\_private/monitor.py”, line 449, in \_run  
> time.sleep(AUTOSCALER\_UPDATE\_INTERVAL\_S)
> 
> 2023-10-30 11:30:39,500 WARNING dashboard.py:236 – Exiting with SIGTERM immediately…

Can anyone please help me to figure out what could be the issue?

---

<div class="post-metadata">

**Author:** ![Yuneetha\_Alaparthi](https://avatars.discourse-cdn.com/v4/letter/y/b38774/32.png) [@Yuneetha\_Alaparthi](https://discuss.ray.io/u/Yuneetha_Alaparthi)\
**Post date:** [October 31, 2023, 11:56am UTC](https://discuss.ray.io/t/container-in-head-node-stopped-unexpectedly/12658/2 "2023-10-31T11:56:30Z")

</div>

I have checked the dashboard\_agent.log file. Here is the information from it

> 2023-10-30 11:33:51,280 ERROR optional\_utils.py:281 – Unexpected error in handler: No module named ‘fastapi’. You can run `pip install "ray[serve]"` to install all Ray Serve dependencies.  
> Traceback (most recent call last):  
> File “/usr/local/lib/python3.8/dist-packages/ray/dashboard/optional\_utils.py”, line 279, in decorator  
> return await f(self, \*args, \*\*kwargs)  
> File “/usr/local/lib/python3.8/dist-packages/ray/dashboard/modules/serve/serve\_agent.py”, line 89, in get\_serve\_instance\_details  
> from ray.serve.schema import ServeInstanceDetails  
> File “/usr/local/lib/python3.8/dist-packages/ray/serve/ **init**.py”, line 29, in   
> raise e  
> File “/usr/local/lib/python3.8/dist-packages/ray/serve/ **init**.py”, line 4, in   
> from ray.serve.api import (  
> File “/usr/local/lib/python3.8/dist-packages/ray/serve/api.py”, line 7, in   
> from fastapi import APIRouter, FastAPI  
> ModuleNotFoundError: No module named ‘fastapi’. You can run `pip install "ray[serve]"` to install all Ray Serve dependencies.  
> 2023-10-30 11:33:51,281 INFO web\_log.py:206 – 10.40.40.50 [30/Oct/2023:06:03:51 +0000] “GET /api/serve/applications/ HTTP/1.1” 500 1019 “-” “Python/3.8 aiohttp/3.8.6”