# Lots of Warnings while launching a cluster
**URL:** https://dask.discourse.group/t/lots-of-warnings-while-launching-a-cluster/1694
**Category:** Uncategorized
**Created:** [March 27, 2023, 9:26am UTC](https://dask.discourse.group/t/lots-of-warnings-while-launching-a-cluster/1694 "2023-03-27T09:26:14Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@kvdm.dev](https://dask.discourse.group/u/kvdm.dev)
#### Post date: [March 27, 2023, 9:26am UTC](https://dask.discourse.group/t/lots-of-warnings-while-launching-a-cluster/1694/1 "2023-03-27T09:26:14Z")
Is it alright to see so many warnings during a normal launching scenario?
That’s kind of annoying.
```python
In [7]: from dask.distributed import Client, progress, LocalCluster
...:
...: cluster = LocalCluster(dashboard_address='127.0.0.1:8787',
...: worker_dashboard_address='127.0.0.1:8787',
...: n_workers=8,
...: threads_per_worker=1,
...: memory_limit='400MiB')
...: client = Client(cluster)
/home/vol/.local/lib/python3.8/site-packages/distributed/node.py:182: UserWarning: Port 8787 is already in use.
Perhaps you already have a cluster running?
Hosting the HTTP server on port 34375 instead
warnings.warn(
/home/vol/.local/lib/python3.8/site-packages/distributed/node.py:182: UserWarning: Port 8787 is already in use.
Perhaps you already have a cluster running?
Hosting the HTTP server on port 43001 instead
warnings.warn(
/home/vol/.local/lib/python3.8/site-packages/distributed/node.py:182: UserWarning: Port 8787 is already in use.
Perhaps you already have a cluster running?
Hosting the HTTP server on port 46245 instead
warnings.warn(
/home/vol/.local/lib/python3.8/site-packages/distributed/node.py:182: UserWarning: Port 8787 is already in use.
Perhaps you already have a cluster running?
Hosting the HTTP server on port 41197 instead
warnings.warn(
/home/vol/.local/lib/python3.8/site-packages/distributed/node.py:182: UserWarning: Port 8787 is already in use.
Perhaps you already have a cluster running?
Hosting the HTTP server on port 36131 instead
warnings.warn(
/home/vol/.local/lib/python3.8/site-packages/distributed/node.py:182: UserWarning: Port 8787 is already in use.
Perhaps you already have a cluster running?
Hosting the HTTP server on port 36221 instead
warnings.warn(
/home/vol/.local/lib/python3.8/site-packages/distributed/node.py:182: UserWarning: Port 8787 is already in use.
Perhaps you already have a cluster running?
Hosting the HTTP server on port 39607 instead
warnings.warn(
/home/vol/.local/lib/python3.8/site-packages/distributed/node.py:182: UserWarning: Port 8787 is already in use.
Perhaps you already have a cluster running?
Hosting the HTTP server on port 35521 instead
warnings.warn(
```
---
### Author:  [@guillaumeeb](https://dask.discourse.group/u/guillaumeeb)
#### Post date: [March 27, 2023, 5:13pm UTC](https://dask.discourse.group/t/lots-of-warnings-while-launching-a-cluster/1694/2 "2023-03-27T17:13:19Z")
Hi @kvdm.dev,
It’s normal considering your code: you’re trying to launch 8 local workers with the same port as the scheduler, so 8 warnings.
---
### Author:  [@kvdm.dev](https://dask.discourse.group/u/kvdm.dev)
#### Post date: [March 27, 2023, 5:29pm UTC](https://dask.discourse.group/t/lots-of-warnings-while-launching-a-cluster/1694/3 "2023-03-27T17:29:51Z")
Ummmm, but i launch a cluster, not workers particularly, that’s a conceptual difference.
So how i should run a cluster with multiple workers to avoid warnings?
---
### Author:  [@kvdm.dev](https://dask.discourse.group/u/kvdm.dev)
#### Post date: [March 27, 2023, 5:33pm UTC](https://dask.discourse.group/t/lots-of-warnings-while-launching-a-cluster/1694/4 "2023-03-27T17:33:23Z")
You probably mean this parameter ` worker_dashboard_address='127.0.0.1:8787',`. I added it without understanding what it is for at the very beginning, because by default the addresses assigned to workers are public `0.0.0.0`.
In such the case i should remove the parameter and somehow disable the `0.0.0.0` default worker dashboard address.
---
### Author:  [@guillaumeeb](https://dask.discourse.group/u/guillaumeeb)
#### Post date: [March 28, 2023, 10:08am UTC](https://dask.discourse.group/t/lots-of-warnings-while-launching-a-cluster/1694/5 "2023-03-28T10:08:20Z")
> [@kvdm.dev](#):
>
> In such the case i should remove the parameter and somehow disable the `0.0.0.0` default worker dashboard address.
Yes, that’s it. Did you try with `worker_dashboard_address='127.0.0.1:0'` ?
---
### Author:  [@kvdm.dev](https://dask.discourse.group/u/kvdm.dev)
#### Post date: [March 28, 2023, 3:49pm UTC](https://dask.discourse.group/t/lots-of-warnings-while-launching-a-cluster/1694/6 "2023-03-28T15:49:28Z")
It works, thank you. I’ve never seen the zero-port notation .