# Multi spark cluster setup script

## Usage

### Step 1. Clone the repo

Clone the dgx-spark-playbooks repo from GitHub

### Step 2. Switch to the multi spark cluster setup scripts directory

```bash
cd dgx-spark-playbooks/nvidia/multi-sparks-through-switch/assets/spark_cluster_setup-1.0.0
```

### Step 3. Create or edit a JSON config file with your cluster information

```bash
# Create or edit JSON config file under the `config` directory with the ssh credentials for your nodes.
# Adjust the number of nodes in "nodes_info" list based on the number of nodes in your cluster

# Example: (config/spark_config_b2b.json):
# {
#     "nodes_info": [
#         {
#             "ip_address": "10.0.0.1",
#             "port": 22,
#             "user": "nvidia",
#             "password": "nvidia123"
#         },
#         {
#             "ip_address": "10.0.0.2",
#             "port": 22,
#             "user": "nvidia",
#             "password": "nvidia123"
#         }
#
```

### Step 4. Run the cluster setup script with your json config file

```bash
bash spark_cluster_setup.sh config/spark_config_b2b.json

# This will do the following
# 1. Create a python virtual env and install required packages
# 2. Validate the environment and cluster config
# 3. Detect the topology and configure the IP addresses
# 4. Configure password-less ssh between the cluster nodes
# 5. Run NCCL BW test
```