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adding-gpucluster-using-digitalocean.md

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Adding a GPU Cluster Using DigitalOcean

When creating a cluster, GPUStack can leverage DigitalOcean to create workers and add them to the GPUStack cluster.

Preparation

You need to sign up for a DigitalOcean account and create a Personal Access Token on the API page.

digital-ocean-pat

Note: The token scope must be set to Full Access. If you select permissions using Custom Scopes, you may encounter issues deleting droplets.

When starting the MaaS-Base Server, you need to specify the --server-external-url parameter. This parameter is used to configure the worker's --server-url after the droplet is created and the worker is started. If your server is running behind a proxy, please set the proxy address to ensure that droplets running on the public network can access the MaaS-Base Server API using this address after startup.

Create DigitalOcean Cluster

Please refer to the steps in Creating DigitalOcean Cluster

Create Cloud Credential

Create a DigitalOcean cloud credential on the Cloud Credentials page.

create cloud

Create Cluster with Cloud Credential

On the cluster creation page, select DigitalOcean as the Cloud Provider:

cloud-provider

Enter a name, select the cloud credential you just created, and choose a region that supports GPU droplets.

select-region

Click Next to create a worker pool for the cluster.

Create Worker Pool

Fill in the Name, Replicas, and Batch Size as needed. Then select the Instance Type (droplet size in DigitalOcean terms) for the worker pool.

select-instance-type

Next, select the OS Image.

select-os-image

Currently, only Nvidia series GPU Droplets are supported, as AMD GPU Droplets are often unavailable. Only Debian-based operating systems are supported.

  • For Nvidia AI/ML Ready (Recommended), which is based on Ubuntu 22.04 and includes drivers, CUDA, and container-toolkit pre-installed, no extra packages are needed.
  • For Debian distributions, the droplet is bootstrapped with the nvidia-open driver, CUDA 12.8, and nvidia-container-toolkit 1.17.8-1 via cloud-init.
  • For Ubuntu distributions, the droplet is bootstrapped with the nvidia-driver-570 driver, CUDA 12.8, and nvidia-container-toolkit 1.17.8-1 via cloud-init.

Labels and volumes are supported to set in worker pool to provision worker. The volumes created and attached for droplet won't be mount into worker container automatically. You can modify the run worker script in /opt/gpustack-run-worker.sh to mount the volumes as needed.

Click Save if all set.

Waiting for Workers to be Provisioned

After saving the cluster, navigate to the Workers page to view the provisioning progress of DigitalOcean workers.

provision-worker

The provisioning process includes several steps:

  1. Create an SSH key.
  2. Create a droplet with the SSH key.
  3. Wait for the droplet to start.
  4. Wait for the public IP to be assigned.
  5. Create volumes and attach them to the droplet.
  6. The worker enters the Initialized status and waits for the worker container to start and connect to the server.

Once the worker reaches the Ready status, you can deploy models on it.

worker-provisioned

Safely Scale Down DigitalOcean Workers

When a DigitalOcean worker is no longer needed, follow these steps to safely destroy the droplet:

  • Adjust the replica count of the worker pool to match the number of workers you want to delete. Note that workers are not deleted automatically in this step.
  • Ensure that no model instances are deployed on the workers you intend to delete.
  • Delete the workers as needed. The corresponding droplets will be deleted accordingly.