### Author:  [@RickLan](https://discuss.ray.io/u/RickLan)
#### Post date: [August 20, 2021, 12:01pm UTC](https://discuss.ray.io/t/errors-running-inside-apache-mesos/3301/1 "2021-08-20T12:01:04Z")
Is running in Mesos supported? I have a small test script that runs fine on my laptop but seems stuck in Mesos (on a server).
Script: [A starter example that trains, checkpoints and evaluates a RL algorithm in RLlib · GitHub](https://gist.github.com/rlan/775607f436894ba596ecf1f0ad194e98)
Python 3.6
Ray 1.5.2
In `/tmp/ray/session-latest/logs`:
```auto
$ more python-core-worker-ce2ebe3ec1155a2b1b632cfdf3d7e24d6509bd005730bbaa089ce074_13951.log
[2021-08-20 18:47:19,700 I 13951 13951] core_worker.cc:152: Constructing CoreWorkerProcess. pid: 13951
[2021-08-20 18:47:19,716 I 13951 13951] core_worker.cc:374: Constructing CoreWorker, worker_id: ce2ebe3ec1155a2b1b632cfdf3d
7e24d6509bd005730bbaa089ce074
[2021-08-20 18:47:19,716 I 13951 13951] grpc_server.cc:71: worker server started, listening on port 34417.
[2021-08-20 18:47:19,721 I 13951 13951] core_worker.cc:438: Initializing worker at address: 100.99.156.11:34417, worker ID
ce2ebe3ec1155a2b1b632cfdf3d7e24d6509bd005730bbaa089ce074, raylet 3145084fdfebfb28eaee8050593f51f0f7511c003948be2523e5be6a
[2021-08-20 18:47:19,737 E 13951 13951] logging.cc:299: ***SIGABRT received at time=1629452839 on cpu 18***
[2021-08-20 18:47:19,737 E 13951 13951] logging.cc:299: PC: @ 0x7fa8e8137337 (unknown) raise
[2021-08-20 18:47:19,738 E 13951 13951] logging.cc:299: @ 0x7fa8e8def5f0 (unknown) (unknown)
[2021-08-20 18:47:19,739 E 13951 13951] logging.cc:299: @ 0x61726f706d657420 (unknown) (unknown)
```
```auto
$ more raylet.err
terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable
***SIGABRT received at time=1629452839 on cpu 34***
PC: @ 0x7f7c4e3dd337 (unknown) raise
@ 0x7f7c4f0955f0 (unknown) (unknown)
@ 0x61726f706d657420 (unknown) (unknown)
terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable
***SIGABRT received at time=1629452839 on cpu 56***
PC: @ 0x7fc352360337 (unknown) raise
@ 0x7fc3530185f0 (unknown) (unknown)
@ 0x61726f706d657420 (unknown) (unknown)
terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable
***SIGABRT received at time=1629452839 on cpu 54***
PC: @ 0x7fa873277337 (unknown) raise
@ 0x7fa873f2f5f0 (unknown) (unknown)
@ 0x61726f706d657420 (unknown) (unknown)
terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable
***SIGABRT received at time=1629452839 on cpu 64***
PC: @ 0x7f4832995337 (unknown) raise
@ 0x7f483364d5f0 (unknown) (unknown)
@ 0x61726f706d657420 (unknown) (unknown)
terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable
***SIGABRT received at time=1629452839 on cpu 54***
PC: @ 0x7f60c964b337 (unknown) raise
@ 0x7f60ca3035f0 (unknown) (unknown)
@ 0x61726f706d657420 (unknown) (unknown)
/bin/sh: fork: retry: No child processes
terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable
***SIGABRT received at time=1629452839 on cpu 86***
PC: @ 0x7eff124d9337 (unknown) raise
@ 0x7eff131915f0 (unknown) (unknown)
@ 0x61726f706d657420 (unknown) (unknown)
terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable
***SIGABRT received at time=1629452839 on cpu 80***
PC: @ 0x7f70be8b4337 (unknown) raise
@ 0x7f70bf56c5f0 (unknown) (unknown)
@ 0x61726f706d657420 (unknown) (unknown)
/bin/sh: fork: retry: No child processes
terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable
***SIGABRT received at time=1629452839 on cpu 6***
/bin/sh: fork: retry: No child processes
PC: @ 0x7f73e03e0337 (unknown) raise
@ 0x7f73e10985f0 (unknown) (unknown)
@ 0x61726f706d657420 (unknown) (unknown)
Traceback (most recent call last):
File "/home/rick.lan/.local/lib/python3.6/site-packages/ray/workers/default_worker.py", line 187, in
worker_shim_pid=args.worker_shim_pid)
File "/home/rick.lan/.local/lib/python3.6/site-packages/ray/worker.py", line 1361, in connect
worker.import_thread.start()
File "/home/rick.lan/.local/lib/python3.6/site-packages/ray/_private/import_thread.py", line 46, in start
self.t.start()
File "/opt/conda/lib/python3.6/threading.py", line 846, in start
_start_new_thread(self._bootstrap, ())
RuntimeError: can't start new thread
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
File "/home/rick.lan/.local/lib/python3.6/site-packages/ray/_private/client_mode_hook.py", line 82, in wrapper
```
---
### Author:  [@TanjaBayer](https://discuss.ray.io/u/TanjaBayer)
#### Post date: [August 20, 2021, 2:13pm UTC](https://discuss.ray.io/t/errors-running-inside-apache-mesos/3301/2 "2021-08-20T14:13:14Z")
We where running it on dcos which is build on mesos. And it was running.
I think the main question her is: how do you run the cluster?
---
### Author:  [@RickLan](https://discuss.ray.io/u/RickLan)
#### Post date: [August 20, 2021, 11:04pm UTC](https://discuss.ray.io/t/errors-running-inside-apache-mesos/3301/3 "2021-08-20T23:04:30Z")
Thanks for sharing.
I don’t know how the cluster is run. I’m an end user, not the admin. I did install Ray in the instance I was given. I probably need to work with my Mesos admin. Is there something else I should give them about Ray?
---
### Author:  [@TanjaBayer](https://discuss.ray.io/u/TanjaBayer)
#### Post date: [August 21, 2021, 6:48am UTC](https://discuss.ray.io/t/errors-running-inside-apache-mesos/3301/4 "2021-08-21T06:48:27Z")
What I mean:
is it one node with several CPU’s or different nodes (a cluster) with several CPU‘s
We where running all our stuff I side docker containers, that might be a difference. But I am also only a user not an expert there…
---
### Author:  [@RickLan](https://discuss.ray.io/u/RickLan)
#### Post date: [August 21, 2021, 7:25am UTC](https://discuss.ray.io/t/errors-running-inside-apache-mesos/3301/5 "2021-08-21T07:25:02Z")
> [@TanjaBayer](#):
>
> is it one node with several CPU’s or different nodes (a cluster) with several CPU‘s
Good question. I have no idea… above my pay grade 😛
---
### Author:  [@RickLan](https://discuss.ray.io/u/RickLan)
#### Post date: [August 23, 2021, 7:39am UTC](https://discuss.ray.io/t/errors-running-inside-apache-mesos/3301/6 "2021-08-23T07:39:05Z")
It turns out something was wrong with my Mesos instance. After recreating it from scratch, the test script ran fine.