> ## Documentation Index
> Fetch the complete documentation index at: https://training-docs.cerebras.ai/llms.txt
> Use this file to discover all available pages before exploring further.

#  Cerebras Cluster Settings 

## Credentials path and management address

The `credentials_path` and `mgmt_address` parameters are set by default in `/opt/cerebras/config` and typically do not require explicit specification.

An example configuration in `/opt/cerebras/config` might look like this:

```Bash theme={null}
  {
  "clusters": [
          {
          "name": "system-name",
          "server": "1.2.3.4:9000",
          "authority": "cluster-server.system-name.example.com",
          "certificateAuthority": "/opt/cerebras/certs/tls.crt"
          }
  ],
  "contexts": [
          {
          "cluster": "cluster-name",
          "name": "system-name"
          }
  ],
  "currentContext": "system-name"
  }

```

## Python paths and mount directories

When running jobs, it’s crucial to include paths required by dataloaders and any external Python packages, as well as the location of the Cerebras Model Zoo.

Consider this directory structure as an example:

```Bash theme={null}
  /path/to/datasets
        my_dataset/

  /path/to/modelzoo
          modelzoo

  /path/to/packages
          package_x
          package_y
```

If input workers need to access the “my\_dataset” directory and require Python modules from the Model Zoo, “package\_x”, and “package\_y”, you would specify the command like this:

```Bash theme={null}
cszoo fit params.yaml \
  --mount_dirs /path/to/datasets /path/to/modelzoo /path/to/packages \
  --python_paths /path/to/packages /path/to/modelzoo
```

<Note>
  If some paths have a common parent folder, you only need to specify the parent in the `--mount_dirs` or `--python_paths arguments`. For instance, if the Model Zoo is at `/cb/home/user/modelzoo` and data is at `/cb/home/user/data`, you only need to specify `--mount_dirs /cb/home`.
</Note>

You can also set defaults for `mount_dirs` and `python_paths` in a YAML file and export it as an environment variable to streamline command line usage:

```Bash theme={null}
export CEREBRAS_WAFER_SCALE_CLUSTER_DEFAULTS=/path/to/defaults/file.yaml
```

With this environment variable set, you won’t need to specify `--mount_dirs` and `--python_paths` when running a Cerebras Model Zoo job, unless you’re adding additional paths.